solar powered yacht reviews

Yachting Monthly

• Digital edition

Sailing with solar power: A practical guide

• Duncan Kent
• November 13, 2020

The latest solar technology makes self-sufficient cruising much more achievable. Duncan Kent gives the lowdown on everything you need to get your boat sorted

SOLAR POWER ON BOARD

Solar power is fast becoming the most popular and economic method of keeping the batteries charged on a boat.

Particularly now that the efficiency of photovoltaic (PV) panels, charge controllers and batteries is improving every day.

Furthermore, the latest technology in regulators and charge controllers has brought about a noticeable increase in useable power output, so the problems of shading and non-alignment can be compensated for more easily.

Not only has PV equipment become more efficient and cost-effective, but many of the modern devices we want to use on a boat have become less power hungry.

This means it is now far easier to provide your entire yacht’s electrical needs, both 220Vac and 12/24Vdc, from natural energy resources – particularly solar power, even if you are planning on a fully electric boat .

Thinking carefully about how much power you need and how much your boat can accommodate is key to planning a solar array. Credit: Graham Snook

WHAT DO YOU NEED?

For instance, a boat with two new, good quality, deep-cycle house batteries of 100Ah each would supply 100Ah of energy to consume between charges, if you only use the recommended 50% of available charge between each charge cycle to protect the batteries.

From this you could run:

• a modern 12Vdc fridge (approx. 1.5Ah, or 36Ah over 24hrs),
• all LED lighting (say 20Ah per day),
• various small device chargers (20Ah)
• and a number of other items such as water pumps, TVs and stereos (25Ah/day)
• Totalling around 100Ah.
• For this you’d need 400W of solar capacity.

Of course, if you like to run a lot of AC devices off-grid such as hair dryers, microwaves, toasters and the like, then you’re going to need a DC/ AC inverter, which will take you to another level in power consumption terms.

But even then, with careful planning, solar could provide a large portion of the power you need before resorting to engine charging or a generator.

THE AVAILABLE SPACE

In practical terms, a modern 40ft monohull would have the space for around 1,200W of PV panels (cockpit arch, sprayhood top, deck), maybe 1,500W with the addition of a few portable panels for use at anchor.

The 1,200W of fixed position solar array could produce around 360Ah on a sunny summer’s day (zero shading) or more likely 250Ah on the average UK summer’s day.

So that’s enough for your 100Ah general DC consumption plus another 150Ah of AC consumption via the inverter.

Of course, to do this you’ll most likely need to increase your battery capacity to around 400-500Ah for maximum flexibility (you’ll need to store as much as possible during daylight hours), a typical figure for a 40-50ft offshore cruising yacht these days.

Get your solar charging right and you may never need to hook up to shore power

Typical daily inverter loads for a cruising yacht off grid might be:

• induction cooking plate (20min) 60Ah
• microwave (15min) 30Ah
• coffee maker (20mins) 25Ah
• hair dryer (5min) 15Ah
• laptop charger (2h) 10Ah
• or around 140Ah in total.

The trick is to monitor the batteries’ state of charge (SOC) at all times and vary your use of the inverter to suit.

For example, you might want to cook supper mid-afternoon, when solar is in abundance, and then reheat it in the evening when you want to eat it.

In some cases, when you’re cruising in warm climates such as the Med, you might end up with excess charge from your solar panels .

In this situation, many long-term cruisers devise a method of ‘dumping’ the extra energy by heating water for showers.

Do bear in mind if you’re planning to live aboard full time , then it’ll be a whole different story on cloudy days and during the winter, when inverter use might need to be knocked on the head entirely.

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POWER DISCREPANCIES

There’s often confusion as to how much power you can harvest from a solar installation.

A PV panel is nearly always advertised stating its theoretical peak output power (Pw).

But in reality, on a yacht where there are limited areas in which to mount them, they will more likely produce a maximum of 60% of their peak output if mounted horizontally, increasing to 80% if tilted towards the sun and regularly adjusted.

The latter is rarely achievable on a boat, however, as even at anchor it can swing through an arc of 180° in wind or tidal shifts .

Flexible panels can be mounted on sprayhoods or awnings to add power when it’s needed at anchor or in harbour

INSTALLATION

Having trawled through hundreds of ‘deals’ to get the best price on the most efficient panels you can afford you now need to know how to install them to best fulfill your energy generation needs.

The output, even from the highest quality photo-voltaic array, will only be as good as the installation itself.

So following our guidelines should ensure you extract every last drop of energy from your investment.

PANEL MOUNTING

Sailing boats are not the ideal structure on which to mount wide, flat PV panels.

So before you go ahead and purchase what looks like the biggest and best, take a few minutes to decide on exactly where you can mount them, as this will affect what size and type of panels you should buy.

In many cases the first choice would be on an arch, davits or gantry aft, especially if you already have, or plan to fit one.

Dinghy davits, particularly on multihulls, can support a huge solar capacity

These allow a solid metal framework to be constructed that will be strong enough to take the heavier, more productive rigid PV panels.

You can also build in some form of adjuster to the framework that will allow the panels to be orientated towards the sun for the best performance.

With luck (or careful planning) a gantry will also keep them aft of the boom, thereby eliminating loss of output caused by boom shading.

The next most popular position for mounting the panels is on a cockpit sprayhood or bimini, although this will often mean using the flexible or semi-flexible panels, which are generally less efficient than the rigid ones for the same area.

ELEVATED MOUNTING

Alternatively, there are kits available for mounting panels onto lifelines, which can allow their elevation to be manually adjusted to a certain degree.

Pole-mounted panels can be used for maximum adjustability

Finally, panels can be fitted directly onto the deck by either gluing them down using mastic or attaching them onto a rigid support frame.

Once again you will probably need to use semi-flexible panels – especially if the deck surface is curved.

Rigid, glass-coated panels will obviously not be suitable for deck mounting in an area that is frequently walked over.

Don’t be tempted to drill through the panels, even along the edges, as this will invalidate the warranty and possibly damage the panel.

With solid panels, the ability to adjust the angle can add significantly to output

It might seem obvious, but the key to an efficient system is to avoid shading wherever possible.

It’s no good fitting expensive, high-efficiency PVs right under the boom as they’ll perform little better than the cheaper types.

Saying that, in good quality panels each cell will be isolated from the next by a series of diodes (one-way electrical valves), so that if one cell is shaded at least it won’t drag down the other cells within the same panel.

Older panels often didn’t have these, so the slightest partial shading caused the output of the entire panel to cease.

OVERHEATING

Another important factor that is often ignored when installing the panels is that of overheating.

If a PV panel gets too hot, which is quite likely if mounted directly onto a flat surface without an air gap behind, its output will drop quite noticeably.

To allow for some air circulation behind the panels it’s best to apply mastic adhesive in numerous large dabs.

This is best achieved by placing wooden spacer strips between the dabs until the mastic has completely cured, after which the spacers can be removed.

You might need some form of trim around one or more of the outside edges, though, if they are positioned where sheets and other lines might get caught under them.

Raising the panels up will also help water to drain off and thereby helping to avoid possible delamination from sitting in water for too long.

CHARGE CONTROL

A PV module cannot supply an electrical device directly due to the changeability of the sunlight, which in turns varies the current it can produce.

Therefore, it has to be connected to a battery, which stores and smooths its output.

Whatever the size of your solar array you will need to fit a regulator, or charge controller as they are now more commonly known, to the system in order to control the output and to help extract as much power from the panels as possible.

There are two types of PV charge controller.

The older designs, called Pulse Width Modulation (PWM) types, were fairly basic voltage regulators and simply output volts at just above battery level.

The latest controllers use Multi Power Point Tracking (MPPT) technology and can accept much higher input voltages (up to 240Vdc).

MPPT controllers can be up to 30% more efficient as they use the peak output of the panels to charge the batteries, even compensating for partial shading.

BEWARE FAKE GEAR

If you buy online do be careful to ensure you’re getting what you pay for.

There are a huge number of fake MPPTs out there, which are simply the much cheaper PWM dressed up with fake labels.

It’s hard to tell which is which, but the old adage of ‘if it looks too good to be true, it usually is’ makes good sense.

MPPT controllers are usually bigger and heavier than PWMs, but if in doubt call or email the supplier to discuss the pros and cons of their kit before buying.

If they’re not happy to chat and advise you then I would steer clear of their gear.

Some good MPPTs are made in China, but unless they have a UK supplier, I wouldn’t bother with them as you’ll have no follow-up advice.

To calculate what size controller you need simply divide the panel’s peak power in Watts (Wp) by the battery voltage, which will give you the maximum current (Amps) they could theoretically supply.

For example 240W/12V = 20A. Although it’s unlikely you’ll ever get near the peak output from any PV panel, it’s best to go for the maximum possible.

Induction cooking is now a reality on board, even without shore power

PV panels come with a short length of cable, usually around 1m long.

Some are supplied with MC4 connectors already attached but most only provide bare wires.

The latter can be easily extended using proper waterproof connections but thought must be given as to the current rating and voltage drop (usually max 3%) for the size of cable you intend to use.

If in doubt, bigger is better!

Panels can sometimes be ordered with the wiring on the back so that the cable can go straight below deck through a hole under the panel.

You may need to fit extra battery capacity if you want to run an inverter from solar charging

SERIES OR PARALLEL?

A commonly asked question is ‘should I wire my PV panels in series or in parallel?’

The simple answer is, if there’s any danger of frequent shading to one or more of the panels then install them in parallel.

If wired in series the shading of a single panel will drag down the output from all of the others in the same series.

PARALLEL IS PREFERRED

Most commonly, multiple panels are wired together in parallel to a single charge controller, with diodes protecting each panel from discharging the others should one become partially shaded.

With the advent of MPPT controllers, however, there can sometimes be a benefit to wiring two or more identical panels into a series bank, thereby presenting a higher voltage to the controller.

It’s worth noting that, like batteries, wiring PV panels in series increases the voltage only – the current capacity of the array remains the same as for a single panel.

‘Where’s the benefit of wiring them in series then?’ you might ask.

Well, the higher the voltage fed into the MPPT, the more consistent it will be with its output, which could, in some cases, prove more efficient than a parallel installation with PWM controllers.

It’s also likely to be necessary if you have a 24V domestic system.

SERIES WIRING

Series wiring is usually only done when the cable runs are long, as it helps negate the voltage drop caused by the resistance of the cable.

While a decent controller will have no problem handling the output from four or even five panels wired in series, it is often inappropriate for sailing yachts as shading just one of the panels will reduce the output of the entire series array.

If you need to do so in order to reduce cable runs then it’s best to split the panels between each side of the boat – a series bank on each side.

If you do this, then you would ideally fit a separate controller to each series PV bank and then connect their outputs together in parallel to the battery bank.

Note, however, that panels wired in series must all be the same types with an equal number of cells per panel.

Furthermore, the charge controller needs to be sized for the total of all panel voltages added together and the current rating of one individual panel.

Differently rated panels can be connected together in parallel but only if each panel has its own controller.

The outputs of the individual controllers can then be joined together to go to the battery bank.

BATTERY BANK QUESTION

Another frequently asked question is ‘Can I connect another charging source to the battery bank while the solar array is charging?’

The answer is yes.

Any decent PV controller will be protected against feedback from other charging sources.

Think carefully about where shade from mast, boom and rigging will fall. Credit: Graham Snook Photography

CABLE SIZE AND CONNECTORS

A frequent cause of reduced output from PV arrays is wiring that is too small.

The resistance of a wire conductor increases in direct proportion to its cross-sectional area, so go as big as is practicable for the least cable loss.

Each panel should be supplied with the correctly sized cables for its own maximum output.

But if you’re combining panels, either in parallel or in series, you will clearly need to rate the single feed cable to suit the maximum current available at theoretical peak solar output and to minimise voltage drop.

Likewise, the cable from the controller to the batteries should be sized to suit the controller’s maximum output current and protected with a fuse.

For outside it’s important to use exterior grade cable, which is double- insulated and UV-proof.

WEATHERPROOF CONNECTORS

And wherever possible use compatible weatherproof connectors (usually MC4) to those found on the panels rather than cutting off the plugs and hard-wiring them.

Field- assembly MC4 plugs are available, so you don’t have to drill large holes in the decks or bulkheads when feeding the cables through.

When joining more than one panel together try to use the approved multiway connectors; not only do they keep the wiring neat and tidy, but they also offer a greater contact area than budget terminal blocks.

If you have to use screw-type connectors make sure to fit proper ferrules to the wire first to avoid any stray wires in the multistrand shorting across the terminals.

When feeding a cable from above to below deck, try to go through an upright bulkhead where possible to minimise ‘pooling’ of water around the access hole.

Also, use a proper watertight deck seal that matches the cable you’re using.

If drilling through a cored deck you need to drill a larger hole first, fill it with epoxy resin and then drill the required size hole through the epoxy to ensure no water gets into the deck core.

Ideally, the charge controller should be mounted no further than 2m from the battery bank.

If you need to go further, you’ll require larger cabling to reduce the voltage drop.

A generous solar array will keep you self- sufficient indefinitely. Credit: Graham Snook Photography

CONTROLLER LOAD TERMINALS

There is often confusion over the ‘load’ output of a charge controller (often depicted by a light bulb) and what can safely be connected to these terminals.

Rarely explained in the manual, the load terminals should be pretty much ignored in a marine installation as the output on these terminals is usually very limited (10A max).

Some attach an LED light to them to indicate the controller is operating, but all your usual electrical loads should remain connected to the batteries with the battery terminals on the controller connected directly to that battery bank via a fuse.

It is possible, though, to control a high-current switching relay in certain conditions.

Parallel installation is more resilient to shading, but a series installation will increase peak charging outputs. A combination of the two offers some of the benefit of both

CIRCUIT MONITORING

Unlike most cheap PWMs, the majority of good quality MPPT charge controllers come with an alphanumeric LCD screen to let you know what is going on.

This can either be a remote display or simply one on the front of the box.

It’s obviously a lot better to have a proper numerical display than to rely on a few flashing LEDs to tell you when something’s not right.

So if your chosen controller doesn’t have one be sure to fit a battery monitor (the shunt type) into your solar circuit between the controller and the batteries.

It doesn’t have to be a very ‘smart’ monitor, just one that can display the voltage and current being supplied by the panels.

For smartphone addicts there are several wifi apps that will do the job remotely on your phone or tablet.

DEVICE PROTECTION

All good quality PV panels feature built-in diode protection between each cell to prevent a shaded cell from dragging down the productive ones.

In addition, there will be internal blocking diodes on the final output to protect the panel from polarity reversal and to ensure that the batteries can’t discharge back into the panel during the night.

The latter can be added externally, the former can’t, so check before you buy.

A fuse, rated just above the maximum current available, should be fitted between each panel and the charge controller.

Another fuse should then be installed between the charge controller’s output and the batteries.

In the case of multiple arrays, this second fuse will be rated higher than the individual panel fuses and should match the maximum current rating of the cable.

With this protection installed other charging devices can be connected in parallel at the battery, meaning the solar can be left connected even when you are hooked up to shore power and the battery charger is operating.

In some circumstances, however, this arrangement can affect the sensing of the battery by the charger, causing it to fall back into float mode.

If this becomes apparent it can be overcome by installing a manual/auto switch to disconnect the solar array when on shore power.

Check the flex of the solar panel is sufficient for your deck

EXCESS POWER DUMPING

A solar charge controller works by disconnecting the supply from the PV panels when the batteries are fully charged.

But for some full-time liveaboards in sunny climates that can be considered a waste, when the excess power could be put to good use – heating water, say.

This is commonly done using an inverter to supply AC power to the heating element.

Alternatively, you can now buy a 12Vdc element for your calorifier (hot water tank) and supply this directly from your battery bank.

Both of these methods would require a voltage sensitive relay (VSR) to disconnect the element should the battery voltage drop below a pre-set level.

Don’t expect boiling hot water, as there will probably only be enough spare power to take the chill off it before your battery bank reaches its lower threshold voltage.

A 600W/12V element will draw some 50A, from the batteries, whereas a 1kW AC element run through an inverter will need close to 100A.

A small, semi-flexible panel will be sufficient for keeping batteries trickle charged, but not for heavy use

RIGID, FLEXIBLE, OR SEMI FLEXIBLE?

Despite massive recent improvements in semi-flexible panels in recent years, the solid glass panels still offer a higher power density.

That said, they are heavier, more awkward to mount and can’t be walked on, so unless you have a dedicated gantry aft, you’re better off choosing the more rugged semi-flexibles.

Modules incorporating monocrystalline cells also have a better output than those with polycrystalline cells (that’s cells made from a single slice of silicon as opposed to layers of smaller pieces).

Output voltage also depends on the number of cells on the panel.

In the past this has commonly been 32, but now some 36 and even 40 cell panels are available.

That said, they’re larger, of course, so an array of interconnected smaller panels might be a better solution.

Module efficiency is now more often around the 20% mark, as opposed to 12-15% for older models and semi- flexible (up to 20° bend) are usually better than flexible (up to 180° bend).

A rigid panel is more efficient, but less robust

There are a huge number of panels on the market, but many use the same cells.

Sunpower Maxeon cells are exceptionally good, as are the Panasonic HIT range and LG, but they are pricey.

If the maker is offering a 25-year guarantee instead of a 3-5 year one, you can be pretty confident they’re good.

When it comes to charge controllers it’s definitely worth paying a little more for a decent MPPT.

A cheap PWM might be okay just to keep a small starter battery charged with a 30W panel, but the MPPT will give you much more when it comes to heavy service.

Victron are probably top of the range, while cheaper brands like MakeSkyBlue and EPever are also good value – but treat imports of unclear origin with care.

ABOUT THE AUTHOR

Duncan Kent has been evaluating and reviewing yachts and marine equipment for the past 30 years

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Greener and Better: the Silent 60

• By Chris Caswell
• December 16, 2022

If there was any question that the “Tesla moment” has arrived in yachting, the Silent 60 clearly provides a positive response.

Consider, for a moment, crossing oceans in silence at 5 to 6 knots without consuming a drop of fuel and never needing to plan your course between fuel stops. Imagine sitting at anchor and running the air conditioning all night, not to mention all the galley appliances plus the washer-dryer, without the hum or fumes from a genset.

During my time aboard the Silent-Yachts 60, the electric yacht cruised easily at 8 knots. When I whipped out my sound meter, it barely registered 52 decibels, which is about the sound of a dishwasher. The Silent monitors at the helm showed we were charging our 286 kWh lithium batteries at more wattage than we were using to spin the 340 kW motors, so we were ahead of the power-usage game—and this was in South Florida rain under a solid cloud layer. Had we upped the ante to the yacht’s top speed of 20 knots, it would have been drawing from rather than adding to the batteries, but the speed capability gives skippers the option to outrun weather (or just get to the best moorings first).

The Silent 60 is a catamaran design for several reasons. First, the twin hulls are easily driven to minimize the power needed. Second, with nearly 30 feet of beam, there is enough deck area for the solar panels needed to create power.

Buyers can choose as many as six staterooms, each en suite with stall showers and nearly king-size berths. The salon also uses that beam well, providing bowling-alley space under 7-foot-6-inch headroom. With the Silent 60, the interior is basically a blank sheet, allowing buyers to tailor the layout to their cruising needs.

As for the engine rooms, NASA could take a page from Silent-Yachts: Everything is precisely labeled, placed for easy access and surgery-suite spotless. Externally, the Silent 60 is striking, with reversed bows and black graphic slashes on the topside that conceal dark-tinted windows (which provide bright, airy interiors to the staterooms). What catches the eye most, however, are the 42 solar panels that cover every inch of the cabin top as well as the hardtop over the flybridge. Produced by SunPower in California, these panels feed power to a lithium battery pack reportedly good for 3,000 charge cycles—or an estimated 35 years of normal boating use.

The Silent 60 I got aboard, which was Hull No. 3, had a four-stateroom layout. A larger stateroom forward in the starboard hull served as the master, with an athwartships berth, settee and built-in vanity. This yacht also had a walk-through Dutch door forward in the salon next to the helm, leading to settees on the foredeck as well as providing salon ventilation. Another benefit of the door for short-handed cruisers is quick access to the anchor gear under the foredeck.

Owners can sacrifice the forward door in favor of a forward master stateroom with a king berth just a couple of steps below the salon and an en suite head in the starboard hull. An intriguing design feature is the two outward-facing “window seats” indented into the stateroom on each side deck, which would make a wonderful spot at anchor with a good book.

The salon has a fixed dining table that easily seats eight people on the wraparound settee. There also are loose chairs and a pad just forward for lounging. The helm is raised one step and has twin Simrad multifunction displays plus the Silent systems monitor, all easily understood.

Aft and to port, the U-shaped galley has a dishwasher as well as a full-height fridge to starboard. The fridge setup may change to a pair of undercounter drawer fridges on future boats for easier access and to eliminate a blind spot for the skipper.

Abaft the galley, a window slides open for easy pass-through to the cockpit to serve whatever the cooks have prepared using the Hafele four-burner, two-zone cooktop.

The Silent 60 is a work in progress, and additional changes might be on the way, such as the addition of twin berths that slide together, and a different location for what is now the midsalon washer-dryer (in a console abaft the helm). This hull was built in Thailand, but production is moving to Italy.

Still, the yacht has exceedingly clever design ideas, such as the hinged hardtop on the bridge. The top lowers electrically to seal off the bridge from the weather as well as keep the solar cells from being shadowed. The bridge itself is conventional, with a double-wide helm seat to port that reverses to create wraparound seating for the dining table, and double lounge pads for relaxing, not sunning, since the solar panels take up every bit of sun space.

The cockpit has a settee and an L-shaped table. A hydraulic swim platform is available in varying widths to handle up to a 13-foot tender without impinging on the platforms on either hull. Silent-Yachts also gets points for good walk-around decks protected by toe kicks as well as welded stainless-steel rails.

The Silent 60 is on the leading edge of a greener yachting experience. For cruisers who are looking to lessen their carbon footprint while enjoying some quietude at sea, this yacht is worth serious consideration. 

Built for Safety

Future Silent 60s from Italy will have fully resin-infused fiberglass sandwich construction with carbon reinforcements in high-stress areas. Each of the hulls has watertight bulkheads, sealed floors and three collision compartments for enhanced safety. The foam sandwich core provides thermal and sound insulation.

Kite Sailing

One option available on the Silent 60 is a kite-wing propulsion system using a collapsing mast and hidden winch to fly a 140-square-foot sail. (By comparison, a Laser sail is 76 square feet.) With open ocean breezes of 17 to 21 knots, the builder says the kite can power the Silent 60 at 6 to 7 knots alone, or it can bump the speed with motors to go faster than the usual 8-knot cruise speed. 

Big Sisters

In addition to the Silent-Yachts 60, the boatbuilder has 62-, 80- and 120-foot electric power cats available for owners looking for something bigger. Additionally, it recently started work on the hybrid-powered Silent VisionF 82. 

Take the next step: silent-yachts.com

• More: Catamarans , Electric , Electric Boats , October 2022 , Power Catamarans , Reviewed , Silent-Yachts , Solar Powered Yachts , Yachts
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Solar-Powered Yachts Are Taking Over. Here’s Why That’s a Good Thing.

Diesel-powered engines are getting some healthy competition., michael verdon, michael verdon's most recent stories.

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In 2005, Michael Köhler turned away from the diesel engines that had been powering his boats for 23 years and went instead with solar power, an idea that seemed laughable, given the technology’s limitations at the time. But after five years of testing and development, Köhler’s Solarwave 46 became the world’s first solar-powered yacht.

Since then, his Silent Yachts brand has become larger and ever-more luxurious, running bow-to-bow with traditional motoryachts. The new 80-foot tri-deck has a spacious salon and six staterooms, six-and-a-half-foot ceilings and unlimited cruising potential, since the lithium-ion batteries powering the 250 kw electric motors recharge on the go (and for free) courtesy of the yacht’s 1,227 square feet of solar panels. And the benefits extend beyond minimal emissions and engine vibration. “We have more living space than competitors,” Köhler says, “since electric motors require less space than diesel engines.”

Very different vessels are using electric propulsion to minimize noise and lower emissions, like Super Air’s Nautique GS22E.  Super Air

The solar niche is small but growing, with new entrants like Serenity Yachts and the BYD Group. These power yachts have cruising speeds of 8 knots and top speeds of up to 20 knots, though they’ll burn through battery packs quickly at that rate. Therein lies the design dilemma of battery-powered boats: Do builders prioritize range or velocity?

Correct Craft ’s new GS22E wakesurf boat found a way to twist battery limitations to its advantage. “We’ve designed the most energy-dense battery system for where a combustion engine typically goes,” says Sean Marrero, president of Watershed Innovation, which developed the GS22E’s Ingenity electric propulsion system. Tailored for hour-long sessions, owners can wakesurf in the morning, then recharge the battery so it’s ready after work. “It doesn’t run like a Tesla,” says Marrero, “but rather it mirrors the wakesurf experience with its stern dug into the water—minus the noise and emissions.” Other builders are rumored to have electric towboats in the works.

Feadship ‘s 273-foot Savannah.  Feadship

In the superyacht segment, Feadship director Henk de Vries would like to see every new yacht leaving his Dutch yard equipped with hybrid propulsion by 2025. De Vries is so serious about this mission that Feadship will absorb the extra cost over conventional propulsion, currently amounting to several million dollars, of those electric drives. So far, two boats have chosen hybrid power: the 273-foot Savannah , launched in 2015, and Feadship’s largest build, the 361-foot Anna, delivered two years ago. A third yacht launched that same year, the 287-foot Lonian , is also “heavily hybrid,” de Vries says.

“When we built Savannah , a hybrid with the [battery] equivalent of many Teslas in the engine room, we also invented the classification rules for these yachts,” says de Vries. “Even though the project was successful, the superyacht world was slow to adapt. I want to get to the point where one owner says to another, ‘Oh, your boat still burns fossil fuel?’ That will help create the mindset.”

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Five of the Best Solar Powered Yachts of 2023

• Thursday 10 December, 2020

Silent Yachts founder Michael Köhler drew plenty of laughter across the industry back in 2005 when he announced he was moving away from diesel to build solar-powered luxury marine vessels. When his Köhler’s Solarwave 46 was launched five years later, though, those laughs turned to gasps.

Despite the limitations and expense surrounding the technology back then, he had achieved a stylish creation that had all of the mod cons and ran purely on the power of the sun. It should come as no shock then that Silent Yachts leads off our list of the top five solar-powered yachts on the market today.

Solar powered yachts are becoming increasingly popular in Australia, with more and more people looking for eco-friendly and sustainable ways to explore the country’s stunning coastline. These vessels harness the sun’s power to provide a clean and renewable energy source, reducing the need for fossil fuels and helping to protect the environment. With so many options on the market, it can be difficult to know which yacht is the best for you. To help you make an informed decision, here are five of the best solar powered yachts for sale in 2023.

Exploring solar-powered boats for sale

• Silent 80 Tri-Deck catamarans  

• Silent Yachts Catamaran Silent 55  

The solar-powered Catamaran Silent 55 combines eco-friendly propulsion with luxurious accommodations. It is a 55-foot ocean-going catamaran with four staterooms and restrooms that is solar-powered and self-sufficient. The only mechanical components that need maintenance are the generators; there are no engine noises or vibrations.

The most powerful E-Power+ propulsion option, which combines the largest battery bank with the strongest electric motors, is available on this fully equipped vessel. As a result, faster speeds can be maintained for much longer while optimising the amount of energy stored for backup and used when necessary. E-Power+ provides the best solar-powered yachting experience.

• Serenity Yachts Serenity 64

The Serenity Yachts range is focused on power and can run indefinitely on its array at a cruising speed of between four and six knots while it has top speeds of up to 16 knots. It has electric and hybrid motors that also power all of the amenities and the 64-foot vessel is available in several different layouts.

• Serenity Yachts Serenity 74

• Soel Senses 48

Updated February 2023

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Wind, water and solar power: how alternative energy has been transformed

• July 15, 2015

State-of-the-art solar power, wind and water generators have transformed the efficiency of alternative power sources. Can we say goodbye to diesel? Rupert Holmes investigates

Imagine a future in which there is never any need to fill up with diesel, buy gas, or top up water tanks and the only constraints are those of needing to stock up with food and maintenance of the boat itself.

It’s a scenario that’s much closer than many realise. The past decade has seen an accelerating pace of change, with technologies that appealed only to a minority, or were prohibitively expensive, now firmly entering the mainstream.

It’s already more than five years since the first of Gideon Goudsmit’s 44ft African Cat cruising catamarans sailed from South Africa to the Netherlands without using fossil fuel, even for cooking, watermaking and hot water.

Although many would baulk at the boat’s 80-mile range under power, this is not a quirky vessel in any other respect – it’s a spacious, fully fitted-out, comfortable cruising catamaran with a high level of equipment. In addition to solar and wind generators providing electrical power for the lightweight design, the boat’s electric propulsion motors were configured to be used as generators when under sail.

And it was by no means the first to do this. When Francis Joyon set the fastest time for a solo circumnavigation in 2007/8, his 80ft trimaran IDEC ll did not have a diesel generator. Similarly, Raphael Dinelli completed the 2008/9 Vendée Globe race without using any fossil fuel.

While few owners aspire to this level of self-sufficiency, incorporating some of these ideas can improve reliability and convenience for more conventional yachts, and may also reduce costs. Perhaps the most persuasive reason of all to fit additional means of generating power is that the presence of multiple charging systems improves a boat’s reliability by introducing a degree of redundancy – if one system fails much of the charging capacity remains intact.

Combining several different technologies can also balance the pros and cons of different power sources.

Thin film solar

A new development that could be the answer to the African Cat’s short range under its electric motors is extremely flexible giant solar panels that can be attached to sails, or even incorporated into the laminate. The durability of this technology was demonstrated at the end of last year by Daniel Ecalard, who used a pair of 3m 2 panels near the head of his mainsail to provide the electrical needs of his Open 50, Defi Martinique , during last year’s Route du Rhum race.

During the race the system stood up to a gale in the Bay of Biscay, in which ten per cent of the fleet retired, and survived the 25-day Atlantic crossing, during which Ecalard logged 4,677 miles, intact.

The system, named PowerSails, was developed by Alain Janet, owner of UK Sailmakers France. Each square metre of the panel is capable of generating 100 watts and, according to Janet, does not need direct sunlight to generate electricity: “In fact, the panels on the sail opposite the sun will generate 30-40 per cent of their maximum output with the indirect and reflected light,” he says.

These panels are made from film that’s 65 microns thick and weighs 100 grammes per square metre. This technology can also be used in other applications – a cockpit bimini shade, for instance, that could generate 1kW on a 50ft yacht.

Prices start at around £700 per square metre of panel, though this is expected to fall as production increases.

Mainstream markets

Janet has produced sails for a Dehler 39 in which a sizeable solar panel is laminated to the mainsail. The technology has also been harnessed by production boatbuilder Arcona, which has announced a version of its 38-footer equipped with an electric engine/regenerating system, sails with solar panels and a big bank of lithium ion batteries.

The boat debuted to great acclaim at this year’s Helsinki boat show, where it won the boat of the show award.

The solar panels in the mainsail are of sufficient size to generate an average of 1,000 watts of power, and the boat has a further 1,000 watts of solar panels. This is sufficient to drive it at four knots under power during daylight hours without taking any charge from the batteries.

Solar power

Almost every aspect of this sector has seen enormous development over the past decade, with worldwide installed capacity having grown by 3,000 per cent since 2005. The resulting economies of scale mean prices have tumbled, while funds are continuing to pour into research and development.

Panels are becoming progressively more efficient, with the best commercially available units now having an efficiency of around 25 per cent, although double that has been achieved in laboratory conditions.

At the moment the thin film panels mentioned above are around 12-14 per cent efficient, but in the future we can expect all types of solar panel to become smaller in area for a given output.

In addition, today’s panels are less susceptible to output drops when in partial shade and give good performance in cloudy conditions. This makes mounting panels on the coachroof, rather than a cumbersome gantry, an increasingly viable option.

Currently solar sells for a very wide range of prices, with most marine grade panels priced from around £200 to well over £500 per 100 watts.

Solar Pros:

√         Improving technology with reducing prices

√         Suitable for a wide variety of boats and conditions

√         Proven ‘fit and forget’ reliability

x         Many boats have insufficient space for a enough conventional solar panels

Hydro generators

The transom-mounted generators, such as those produced by Watt & Sea, originally came to prominence in the IMOCA 60 fleet, with the 2008 Vendée Globe race used as a gruelling testbed for the prototypes. They are capable of producing large amounts of power with minimal drag and can be lifted clear of the water when not in use.

The company’s cruising units are rated at either 300 or 600 watts, depending on the model chosen. The larger of these produces 120 watts of power amps at just five knots of boat speed, rising to more than 250 watts at 7.5 knots.

Over a 24-hour period that represents a significant amount of power that could alone run the majority of systems aboard many 50-60ft yachts, including watermakers, pilots, lights, electronics, refrigeration and water heating.

On the downside, hydro generators are relatively expensive compared with solar and wind generators, with Watt & Sea’s prices starting at a little over £3,000. Moreover, they are potentially vulnerable to damage when docking. The latter can be a particular problem in the Mediterranean, where most mooring is stern to the dock.

The Sail-Gen from Eclectic Energy (from £2,000) or the towed Aquair (a little over £1,000) from Ampair are more economic, though less convenient, alternatives.

Another option is a hybrid drive system with a regenerating function via the boat’s main propeller. Advantages include an absence of peripheral parts attached to the transom that may be susceptible to damage, or detract from a yacht’s aesthetics.

√         High power output

√         Impressively low drag

x         Transom-mounted types are expensive

x         Vulnerable to damage

x         Only works when the boat is underway

x         Impeller of transom-mounted models may leave the water if boat is pitching in a head sea

x         Towed type difficult to deploy and recover

Methanol fuel cells

These small, lightweight units have many attractions for use on board. Most are designed to monitor battery state constantly and automatically start charging once the voltage falls to 12.2V. They are almost silent in operation, with carbon dioxide and water the only exhaust products.

Output ranges from around 3 to 9 amps and more than one unit can be used to achieve higher charge rates. Given that a fuel cell can, in theory, run for 24 hours a day – unlike a marine diesel generator, which is more usually used for only two or three hours – a fuel cell can pump out a useful amount of power, despite the low amp hour rating.

On the other hand the long-term cost of ownership is a drawback. With retail prices of around £2,300-5,000 they are relatively expensive to buy, although installation costs are minimal. Additionally, the platinum catalyst has a finite life of around 5-8,000 hours. As this is by far the most expensive element, it’s clear that fuel cells aren’t yet up to providing power 365 days a year for long-term use.

A further problem is with the fuel, which to achieve the purity required is expensive and generally only available from specific outlets.

At the moment it looks as though fuel cells have more cons than pros for many yachts, although there are some circumstances in which they may make sense. For instance, they are popular on long-distance short-handed raceboats. A fuel cell may also be useful on a boat with a hydro generator that is self-sufficient on power while on passage, but may need an occasional boost when at anchor for long periods to supplement solar and wind charging.

√         Unobtrusive, clean and quiet

√         Easy installation

x         Long-term ownership and operating costs

x         Fuel not universally available

Wind generators

For several decades these were de rigueur for serious cruising yachts. On paper a decent-sized unit is capable of generating the entire needs of a 45-50ft yacht. However, they also have a number of drawbacks, the most commonly cited being noise and vibration in strong winds.

In addition, most cruising routes maximise time spent sailing downwind, which reduces apparent wind strength, which in turn dramatically reduces the output of a wind generator. Similarly, generating power in many anchorages can also be problematic, as the very shelter sought by the skipper also means that wind speed is generally significantly reduced.

Nevertheless, wind generators can be useful in some circumstances; the important thing is simply to recognise their strengths and weaknesses.

Prices range from small units producing just four amps or so for less than £400 to upwards of £2,000, although for most medium to large yachts £1,400-1,900 will buy a suitable system.

√         Capable of producing plenty of power in a strong breeze

x         Noisy and creates vibration

x         Output severely reduced in sheltered anchorages and when sailing downwind

x         Can be bulky and cumbersome

Typical daily power outputs

Typical power inputs for 12V systems (divide the ah figures by 2 for 24V systems)

Assuming the panels are mounted in an unshaded position, each 100W of rated capacity can be expected to produce, on average, around 33ah of charge per day during the UK summer.

For a yacht averaging 150 miles per day (6.25 knots), Watt & Sea’s 300W cruising model will produce around 175ah per day. This rises to around 275ah per day at an average speed of seven knots, but falls to 120ah per day at five knots average.

These have by far the biggest range of potential outputs, with many units averaging less than ten per cent of their rated output over a full year. That would equate to a mean of around 50ah per day for a model with blades of around 1.2m diameter.

However, there are few average days and a 24-hour period with steady 15-knot breeze would see the same unit produce more than 100ah per day. In a 25-knot wind it would be 500ah.

The daily output of fuel cells is very predictable. For example, a model rated at 5 amps would produce 120ah per day, if run constantly for 24 hours.

It’s worth noting that, as the catalyst nears the end of its life this figure will tend to reduce.

Battery monitors

The more complex a yacht’s systems, with multiple power inputs and outputs, the harder it is to keep track of the battery state. However, a properly calibrated battery state monitor will measure all the power flows in and out of each battery bank. This makes it easy to keep track of power consumed and keep charge levels above the 50 per cent of battery capacity needed to ensure good battery life.

Reducing power requirements

Despite the increasing complexities of many of today’s yachts, new technologies mean that power requirements are steadily reducing in many cases. Whereas only a few years ago the accommodation of a quality 60ft cruiser might have been lit by 400W of halogen bulbs, low-power LEDs can reduce that by 90 per cent.

Despite their growing size, TVs can now draw less power than a couple of 12V lights did a decade ago. Similarly, tablets and smartphones are increasingly used for activities that not so long ago could only be done with a power-hungry laptop.

Pragmatic solutions for cruisers

For most yachts it’s worth combining a number of different types of technology, depending on how you sail and where. Here are some options for a range of different scenarios:

1. Cruising in Northern Europe

Despite a reputation for inclement weather, solar power can be a very viable option here, thanks to long daylight hours and relatively cool temperatures. The latter may sound counter-intuitive, but the efficiency of solar panels reduces at higher temperatures.

Whether wind power is worthwhile may depend on where you’re planning to sail and the time of year. In mid-summer in the southern half of the UK, for instance, the wind is typically less than ten knots for 50 per cent of the time, so wind generators are of limited use. However, in western Scotland towards the end of the season you could generate plenty of power, which would compensate for the reduced solar output.

With the longest passages most yachts will make being 300-400 miles, a hydro generator is likely to be of less use than for boats making longer voyages. An exception might be for those planning to spend a lot of time at anchor and who therefore value the ability to arrive at an anchorage with batteries fully charged.

2. Mediterranean cruising

While many marina-based yachts, with ready access to shorepower, in the western Med appear to have been slow to adopt solar power, the opposite is true in the eastern Mediterranean where there are increasingly few privately owned yachts without an array of panels.

As an example, Alan and Deborah Mackenzie’s Lagoon 410 catamaran, based in the north-west Aegean, has three 100W semi-flexible panels. This has proved fractionally too small for their needs – to power a fridge, freezer, powerful fans and a 19in TV/DVD in addition to the boat’s systems. They plan to solve this with an additional panel.

Owners of monohulls tend to be more restricted by the space available to mount panels, although the new thin-film panels clearly offer a wider range of options. Given the relatively short distances most yachts travel on each passage, the same considerations regarding a hydro generator in northern Europe apply here.

Equally, in most parts of the Med, wind power is not viable for much of the time.

3. Caribbean

Here it would be easy to assume that solar is the best option. However, while it can certainly be useful, as the main sailing season is winter, when daylight hours are restricted, daily output is smaller than many owners expect. Given that the islands are in the tradewind belt, wind generators stand to produce a good output here.

4. Tradewind passagemaking

Here it’s clear that hydro generators (or power generation via a hybrid drive) have advantages and can deliver a good charge. Wind power, however, makes less sense for tradewind sailing, owing to the reduction in apparent wind speed when sailing downwind.

The output of solar will also suffer from the restricted number of daylight hours on a typical east to west Atlantic crossing. There are, however, more factors in favour of solar on a west to east crossing, as it is likely to be at a higher latitude – with more daylight.

5. World cruising

If you’re going further afield combining as many options as possible will yield the best rates of charging over a wide range of conditions. This is exactly the route taken by Jimmy Cornell, founder of the ARC, whose new Garcia 45 is fitted with solar, a Sail-Gen water turbine from Eclectic Energy and a wind turbine.

The water generator will create 50W of power at four knots of boat speed, rising rapidly to more than 250W at 7.5 knots. The wind turbine, from the same company, is also a high-power model, with a 1.1 metre rotor diameter, producing approximately 100W in 15 knots of wind, rising to 235W in 22 knots.

For more information:

www.africancats.com

www.sunware.de

www.solarclothsystem.com

www.wattandsea.com

www.efoy.co.uk

Eclectic Energy: www.duogen.co.uk

www.oceanvolt.com

www.ampair.com

www.hybrid-marine.co.uk

www.victronenergy.com

This is an extract from the June 2015 issue of Yachting World

Sustainability Success

10 SOLAR Boats 2023 & 2024 | Electric Yachts & Catamarans

With more steps being taken towards sustainable development, new, eco-friendly solar boats have been introduced in the world of green travel: solar electric catamarans. 

Solar boats are electric yachts that can go for long distances without needing to stop for fuel and without emissions. Those solar catamarans are interesting eco-friendly alternatives to the classic power boat or sailing yacht for cruising. However, there are also a few disadvantages that you should know about before purchasing one!

Table Of Contents

10 Solar boats, electric yachts & catamarans

Here are the best solar boats that will delight you with a top-notch sustainable yachting experience based on your requirements:

Sunreef Yachts – Eco 80 Sail Catamaran

• Silent Yachts – Silent 80 3-Deck

HH Catamarans – HH44

Silent yachts – silent 60, sunreef 43m eco (140 ft).

• Silent 120 Explorer
• 100 Sunreef Power Eco

Azura Marine – Aquanima 40

Soel yachts – soel senses 48, serenity yachts – serenity 64 (hybrid).

Here’s a quick summary of the features of the best solar catamarans for green yachting in 2023-2024:

If you are an advocate of sustainable yachting or sustainable tourism and are looking to buy an eco-friendly boat that doesn’t rely on fossil fuels , then you would do well to consider getting a solar catamaran. In this article, I will go through the pros and cons of 10 of the best solar yachts and superyachts that you can buy in 2023 and 2024!

It is also important to note that while there are solar panels for sailboats that you can fit on older models, those new boats have been specifically designed to maximize the use of renewable energy.

Most Luxurious + Most innovative solar system

The Eco 80 Sail Catamaran is one of the electric solar boats provided by Sunreef Yachts.

It features a unique “solar skin” that covers all composite structures on the boat, including hull sides, boom, mast, bimini, and superstructure. This green tech makes it possible to place solar panels where it wouldn’t normally be possible (like the hull and any other smaller but useful surface) and provide enough solar energy from every angle.

The boat is 80-feet long (24.38 meters) and includes electric motors that push it smoothly over the water without causing any vibrations or noise.

Besides being solar powered boat, the Eco 80 Sail Catamaran can also be powered by wind and hydropower. It is designed with a sail on its structure, allowing it to tap into wind power and supplement the solar.

The solar powered sailboat generates enough green power not only to propel the boat and keep it moving but also to charge the essential electric water appliances and other water-sport toys.

So far, the Sunreef Yachts Eco solar sailboats have earned a good reputation for being eco-friendly and sustainable. Besides, this solar powered catamaran takes its commitment to the environment a notch higher by using recycled materials , natural fibers, and non-toxic paints to create their boats.

It is no wonder that Sunreef Yachts have been winning environmental awards for so many years. This solar sailboat is one of the most remarkable boats you can ever invest in and it clearly shows the latest advancements in technology .

Prices: about $8 million USD

Where to buy : Sunreef Yachts .

• Larger surface covered with solar panels, that are installed also along the hull, and in other unusual areas.
• The batteries are 30% lighter than normal
• Unlimited cruising range.
• It runs silently and does not cause pollution.
• It has also traditional sails, so it can cruise also when it is not sunny without relying on batteries.
• Luxury, superb quality and finishing
• Great helm position.
• The solar catamaran is very costly (going for $8 million USD or more).
• The solar panels installed on the sides of the catamaran may not be appealing to the eye of all people.

Silent Yachts – Silent 80 Tri-Deck Solar Catamaran

Best pure electric

The Silent 80 Tri-Deck Solar yacht is popular for the large amount of space it offers.

This solar catamaran by Silent Yachts features three large decks that can be easily customized to fit the owner’s preferences and needs. The topmost deck can either be open or enclosed.

This solar powered yacht offers 4 to 6 cabins that are customizable, regardless of whether the deck remains open or enclosed. Besides, the top deck provides additional living space and can be used as a luxury master suite that opens onto a private space outdoors.

Where to buy : Silent Yachts .

• Purely electric propulsion that can be helped by the kite sail.
• The finishing, while being of high standards, doesn’t seem to be at the level of other options in its category.
• Quite costly, with prices starting at about $6 million USD.
• If going for a long cruise during cloudy days you may need to run the generator to keep going.
• The kite sail helps to give some propulsion using wind, but it is less effective than traditional sails.
• The absence of a traditional sail may make the boat a bit less stable, compromising a bit of the comfort while cruising.

Best for world cruising

HH Catamarans is a small boutique boat builder designing some of the most impressive solar boats for cruising, with one of their latest creations being the HH44.

The HH44 is a groundbreaking new boat that is designed to be eco-friendly and efficient.

The boat has a large battery bank that can be charged by solar panels, and also has two electric motors that can be used for electric propulsion up to 7 knots for up to 2h.

The HH44 has an innovative propulsion system named Eco-Drive. This is a parallel hybrid system that combines diesel and electric propulsion for long-range motoring and silent electric propulsion.

The boat also has two diesel engines, which can be used for long-range motoring or to generate electricity. The boat is also designed to be safe, with four propulsion devices plus sails and a large solar array.

The HH44 has a number of technical features that make it a groundbreaking eco-friendly design, including:

• 3 types of propulsion: full electric, standard diesel, and sail.
• 4.2 kWh of solar panels: generating power for recharging the lithium battery bank for solar .
• 10 kW electric motors (5kW each): mounted on the back end of each diesel engine for electric propulsion.
• The diesel engines can be used both for propulsion and as electric generators.
• Possibility to use the propellers to recharge the battery while the boat is sailing. Kind of like using hydropower to charge your solar batteries , pretty cool!

The HH44 is also a performance catamaran thanks to its C-shaped §daggerboards. Daggerboards are an essential component of many sailing vessels, providing both vertical lift and increased upwind sailing performance.

This solar powered yacht features up to 4 double cabins and 2 heads . Not bad for this world-cruising vessel!

If instead, you are looking for a larger boat, HH Catamarans also have other models up to 88ft.

This solar catamaran was also the preferred choice of Gone with the Wynns , a popular cruising YouTube channel. Here’s their announcement video:

Where to buy : HH Catamarans .

• A true performance world cruiser.
• Very resilient with 3 different propulsion modes (electric, sail, and conventional engines) and ideal for offshore cruising.
• It can run silently and without causing pollution.
• More affordable than other solar catamarans, starting from $1 mm USD
• Smaller than other options.
• The improved sailing performance requires narrower hulls, which reduces the available space onboard compared to other traditional vessels of similar size

Best mid-range

The Silent 60 is one of the smaller electric boats made by Silent Yachts. It is designed to be handled by at least two people. The users can either choose to include an additional crew or not.

Despite its outward small appearance, Silent 60 is very spacious and can accommodate a good number of people.

Besides, the electric yacht has a beautiful design that adds to its elegant and luxurious feel. It is usually designed with up to 6 cabins , with each cabin offering every basic amenity you need to have a luxurious stay on the yacht. In fact, the electric solar boat is equipped with everything you need to allow you to live on board permanently!

As someone who loves spending time on the water, I was really excited to learn about the Sunreef 43M Eco: a superyacht that is both eco-friendly and luxurious.

I was especially impressed by the solar power system, which is built into the composite structures of the yacht, and the large hydraulic platform which creates a vast walkaround beach club.

The interior of the solar superyacht is just as impressive as the exterior, with a variety of sustainably-sourced materials and fabrics used throughout as well as energy-saving air-conditioning. The Sunreef 43M Eco can welcome up to 12 guests in the most luxurious conditions.

Silent Yachts – Silent 120 Explorer

Here’s another incredible solar super-yacht by Silent Yachts. The Silent 120 Explorer is a truly unique yacht, designed to explore the world in style and comfort.

Powered by solar energy, this solar catamaran is perfect for those who want to enjoy the beauty of the open seas without worrying about the impact on the environment.

With plenty of space for guests and all the amenities you need onboard, the Silent 120 Explorer is the perfect choice for your next adventure. If you’re looking for a yacht that combines luxury and environmental responsibility, the Silent 120 Explorer is a perfect choice.

The company didn’t yet release detailed information, however, this superyacht seems to be even featuring a helipad under the roof’s solar panels!

The Silent 120 Explorer has plenty of room for guests and all the amenities you need onboard. So if you’re ready to embark on your next great adventure, be sure to consider the Silent 120 Explorer, which will likely start being delivered in 2023.

The 100 Sunreef Power Eco

Sunreef recently launched and sold their first 100 Sunreef Power Eco catamaran, a transatlantic luxury craft that takes solar boat design to the next level.

With massive living space, great autonomy, and impressive features like a flybridge that can be transformed into an outdoor cinema, the 100 Sunreef Power Eco is the perfect vessel for cruising in supreme luxury

This catamaran uses the latest innovations in solar power to achieve outstanding energy efficiency, and its ultralight battery bank provides for silent cruising and infinite range.

The fully customizable interior and exterior make this catamaran a truly one-of-a-kind option, and its use of ethically-sourced and eco-responsible materials is sure to please even the most discerning buyer.

If you’re looking for an electric yacht that is both luxurious and eco-friendly, the 100 Sunreef Power Eco is certainly a great option for you if you can afford it!

The most affordable $

The Aquanima 40 catamaran is entirely powered by solar energy. It features creative adaptations and unique innovations that make it eco-friendlier and more economical boat than other solar-powered catamarans. For example, the solar panels installed on the electric catamaran are built in such a way that they can sell any excess solar energy back to shore stations when connected.

The exterior of the Aquanima 40 has an elegant design. Also, the interior is not only aesthetically pleasing, but also very clean and modern.

The boat is designed with 2 single cabins for the crew and 2 double cabins for guests.

Indeed, this solar boat by Azura Marine is one of the most economical and cost-effective options you can go for when buying a solar catamaran.

• Relatively fast.
• Ideal for short vacations.
• The most affordable solar catamaran, starting at about $0.6 million USD.
• Much smaller than other options.
• Not recommended for long cruises.
• Basic looks and layout.

As its name suggests, the Soel Senses 48 is 48 feet long. It has a slender design and is lightweight , making it more economical than most other solar-powered boats.

The boat is designed with two sleeping berths that can accommodate two people each. It also includes a salon that can offer enough sleeping space for four people. 

Compared with most other solar yachts, the Soel Senses 48 has a much smaller size. Its size, adding to its sleek and innovative design, give it faster speed than other solar-powered boats.

It incorporates 12 solar panels installed on the roof ; all these panels generate a combined electrical power of up to 2.7 kWh. The electricity generated by the solar panels is then stored in two batteries which can be easily configured to hold a maximum solar power of 142 kWh.

Like other Soel Yachts, the Soel Senses 48 glides smoothly over water without causing any noise, rattles, or generating fumes.

It has average cruising speeds of 10 knots, even reaching top speeds of up to 18 knots. However, the solar catamaran cannot run at its top speed for long periods.

Both the interior and the exterior of the Soel Senses 48 have a sleek and modern design. Every single component of the solar catamaran has been designed carefully to make it as functional and comfortable as possible. Therefore, when you board on this boat, you can expect to experience one of the best sailing experiences of your life.

The Serenity 64 Yacht features a diesel engine. It is a hybrid solar boat, which means that it can run on either solar power or on diesel.

The diesel engine especially comes in handy when the users wish to achieve faster cruising.

The solar catamaran is a very spacious electric boat and provides plenty of living space. It is built with four luxurious cabins, with each cabin having its ensuite bathroom. And even though the Serenity 64 is smaller than the Serenity 74 model also built by Serenity, it still provided an elegant feel and a smooth sailing experience.

Solar Boats Pros and Cons

The sun is a powerful and free source of energy, making solar power an attractive option for those looking to power their yacht. Solar panels can be used to generate electricity to run the yacht’s lights, appliances, and even the engine. Solar power can also be used to heat water for showers and laundry. But, what are the pros and cons of solar catamarans?

Here’s a quick summary of the solar yachts’ advantages and disadvantages:

One of the main benefits of solar power is that it is renewable and environmentally friendly. Solar panels have no emissions and do not produce pollution. In principle, they also do not require fuel, making them very cost-effective in the long run. Solar power is also very reliable, as the sun is a constant source of energy.

There are a few disadvantages to solar power. Solar panels can be expensive to install, and while they require less maintenance, this can be quite costly, especially when it will come time to replace the batteries. Solar panels also need to be pointing directly at the sun to be effective, so they may not generate power on cloudy days or at night.

But there’s more, let’s see what some sailing experts are thinking about solar catamarans!

Sailing expert’s solar Boat review

Recently, one of the most popular sailing YouTube channels, Saliling La Vagabonde , published a very honest and interesting review of the solar powered yacht Silent 55. Here’s a summary of their experience:

• 7 Days onboard (6 nights)
• Travelled 145nm with an average speed of 7 knots
• Generator used for about 12h (in total)
• Fuel consumed: 208 liters

Here are some interesting observations they made:

• While cruising it may feel less stable than a standard sailing boat because it doesn’t have a sail to stabilize it when hitting the waves.
• For the Silent 55 it was possible to move at about 3 knots by using only the power generated by the solar panels (without using the batteries) on a sunny day. This means that if you are moving the solar yacht around quite frequently, you will end up using the generator quite a lot to produce the necessary power.
• When the batteries are out of power, the Silent yacht is using a (diesel) generator to supply the necessary power to keep the boat moving and to power the appliances.
• A great luxury yacht with all the comforts and going in the right direction for the future of the sector.
• Overall, the Silent Yacht is a great eco-friendly alternative to a power boat , while if you are thinking about cruising around the world, you would be probably better off going for a standard sailboat (or for some of the hybrid alternatives mentioned in this article, like the HH44).

Why are solar yachts all catamarans?

Solar yachts are all catamarans for 2 main reasons:

• Catamarans have a larger surface, which allows for placing more solar panels and also offers more room for the batteries onboard.
• Catamarans have efficient hulls for their size. This reduces their power consumption while moving.

This makes catamarans the ideal platform to build a solar-powered boat.

Modern solar electric boats are undoubtedly an eco-friendly choice in sea travel and a form of green tourism . Not only do these electric boats provide a smooth sailing experience, but they also reduce the release of emissions into the atmosphere, reducing the environmental impact and enhancing sustainability .

Luckily, given their size, solar catamarans can charge themselves (unlike electric cars ), so they can sail indefinitely without the need to stop for refueling.

If you are environmentally conscious and looking to get a boat that is more viable, desirable, and eco-friendly, you may consider investing in one of the solar yachts discussed in this article!

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Solar Power Boat: Are Solar Panels for Boats Worth the Investment?

• 1 The Promise of Solar Power Boats
• 2 Considerations Before Investing in Solar Panels for Boats
• 3 Real-World Examples
• 4 Conclusion: The Future of Solar Power Boats

In today’s rapidly evolving world, where environmental consciousness is at the forefront of societal concerns, the maritime industry embraces innovative solutions to navigate a greener future. Among these innovations, solar power boats have emerged as a beacon of hope for eco-conscious boaters and enthusiasts. These vessels, equipped with solar panels that capture sunlight and convert it into clean, renewable energy, offer a tantalizing vision of sustainable marine transportation.

But as you stand at the threshold of considering whether to invest in solar panels for your boat, a pressing question looms: Are solar power boats worth the investment? The following exploration will delve into the advantages and essential considerations surrounding solar-powered boats. By the end, you’ll be better equipped to weigh the pros and cons, ultimately making an informed decision regarding this cutting-edge technology’s suitability for your maritime adventures.

The Promise of Solar Power Boats

Solar power boats, also known as solar boats or solar-electric boats, are vessels equipped with solar panels that capture sunlight and convert it into electrical energy to power various onboard systems, including propulsion, lighting, and appliances. The concept of solar-powered boats is appealing for several reasons:

• Environmental sustainability : Solar power boats produce zero emissions, making them a green alternative to traditional fossil-fuel-powered boats. By harnessing the sun’s power, they help reduce the environmental impact of recreational and commercial boating.
• Reduced operating costs : Once installed, solar panels generate free energy from the sun, which can significantly reduce the ongoing operating costs of a boat. This is particularly beneficial for long journeys or continuous use.
• Quiet and clean : Solar-powered boats operate silently, without the noise and pollution associated with internal combustion engines. This creates a more serene and enjoyable boating experience while preserving the marine ecosystem.
• Energy independence : Solar power boats can operate independently from shore-based power sources, allowing more freedom in choosing where and when to sail. This can be especially advantageous for off-grid or remote boating destinations.

Considerations Before Investing in Solar Panels for Boats

While the advantages of solar power boats are compelling, there are several important considerations to take into account before investing in solar panels for your boat:

• Initial cost : The upfront cost of purchasing and installing solar panels, batteries, and related equipment can be significant. However, viewing this as a long-term investment that will pay off through reduced operating costs and environmental benefits over time is essential.
• Energy storage : Solar panels only generate electricity when exposed to sunlight, which means you’ll need an efficient energy storage system (batteries) to store excess energy for use when the sun is not shining. Quality batteries can be expensive and require proper maintenance.
• Space constraints : The available deck space on your boat may limit the size and number of solar panels you can install. Careful planning and design are essential to maximize energy generation while maintaining a comfortable and functional onboard environment.
• Weather dependency : Solar panels are weather-dependent. Cloudy or rainy days can significantly reduce energy production, potentially affecting your boat’s range and performance. Backup power sources may be necessary for extended cloudy periods.
• Maintenance : Solar panels and associated equipment require regular maintenance to ensure optimal performance. This includes cleaning, checking connections, and monitoring battery health. Neglecting maintenance can lead to reduced efficiency and shorter equipment lifespan.
• Return on investment (ROI) : It may take several years to recoup the initial investment in solar panels through savings on fuel and electricity. Calculate the potential ROI based on your usage patterns and consider the long-term benefits to determine if it’s worth the upfront cost.

Real-World Examples

To better understand the feasibility and practicality of solar power boats, let’s look at a couple of real-world examples:

• PlanetSolar : In 2010, the PlanetSolar team achieved a remarkable feat by circumnavigating the globe with a solar-powered boat. The MS Tûranor PlanetSolar is covered with 537 square meters of solar panels, making it one of the largest solar-powered vessels in the world. While this project showcased the potential of solar boats, it also highlighted the challenges of designing and maintaining such a complex system.
• Local recreational use : On a smaller scale, many boat owners have successfully integrated solar panels into their vessels for local recreational use. These boats can operate quietly and efficiently for day trips and short excursions, reducing the reliance on traditional fuels.

Conclusion: The Future of Solar Power Boats

Solar panels for boats hold tremendous promise as a sustainable and eco-friendly solution for marine transportation. While the initial investment and technical considerations may deter some boat owners, the long-term benefits, reduced environmental impact, and the prospect of energy independence make solar power boats an exciting option.

Investing in solar panels for your boat ultimately depends on your budget, intended use, and commitment to environmental sustainability. As technology advances and becomes more affordable, the adoption of solar power in the boating industry will likely grow, making solar-powered boats an increasingly viable and attractive choice for recreational and commercial boaters. If you are willing to embrace this green technology and commit to its maintenance, a solar power boat could be a worthy investment in the future of sustainable boating.

Article Contributors

Sail magazine review team.

SAIL Magazine Review Team reports on best-selling products in sailing and boating. The SAIL Magazine editorial staff is not involved in the creation of this content. SAIL Magazine is reader-supported: When you buy through links on our site, we may earn an affiliate commission. The SAIL Review Team is composed of authors, editors, and sailors. Artificial Intelligence (large language models) may have been used in the research and creation of the content.

To ensure questions about product testing or a specific article are addressed, please contact [email protected]

Silent Yachts

Creators of the world’s first series produced, solar-powered electric yachts.

Unlimited Range

Noiseless cruising, zero emission, minimal maintenance, pioneering solar powered yachting since 2009.

The Original Solar Yacht

As the original inventors of series produced solar-electric yachts, we pioneered this innovative approach. Our first model, the Silent 64, was launched to the market in 2016, several years before any other shipyard considered the possibility of going electric.

Leading Technology

Our founders began to research alternative energy sources to power yachts during the mid 1990s. Today, the technology of our in-house developed solar-electric drivetrain has been perfected and is multiple generations ahead in terms of reliability, performance and efficiency.

Historical Track-Record

In 2009, the Solarwave 46 was launched as our first prototype of a fully solar-electric, self-sufficient ocean-going catamaran. Since then, our electric yachts have cruised many 10.000s of nautical miles, performing flawlessly during a variety of weather conditions.

Enabling Self-Sufficiency

What differentiates a Silent is the unprecedented level of autonomy provided by our yachts. Being able to produce your own energy enables a fully self-sufficient lifestyle on board. Travel the oceans sustainably while making them your infinite playground.

The award-winning entry to solar-electric yachts.

Timeless design meets state-of-the-art technology.

120 Explorer

The boldest expression of solar powered yachting yet.

What Makes Us Unique

The tranquility on board of our yachts is unique. A lack of noise, fumes and vibrations create a deep connection with the sea. Luxury and sustainability finally merged into a holistic experience, working hand in hand with nature by minimizing the impact on the marine environment without compromising comfort.

For optimal performance and efficiency, our solar-electric drivetrain integrates seamlessly with all onboard systems. Compared to fossil fuelled powertrains of motoryachts, electric powertrains have very few moving parts, resulting in minimal maintenance, maximum reliability and significantly lower running costs.

The ability to recharge your own batteries with the sun marks a new era of freedom. Depending on cruising speeds and weather conditions, a Silent has virtually unlimited range, enabling you to live a fully self-sufficient lifestyle on board. Unbound by the limitations of fossil fuels, you are free to explore the horizons.

The technology powering our yachts today has been pioneered by our founders almost three decades ago. Continuous upgrading and steady optimization of the entire system are some of the key reasons our in-house developed solar-electric drivetrain offers a comprehensive portfolio of assurances and warranties.

Powered by an advanced jet propulsion system, the fully electric Tender Series perfectly complements the experience on board of our catamarans. Following the same philosophy as our electric yachts, it was developed with a strong focus on being spacious, lightweight and efficient.

As a new breed of Silent, the Speed 28 combines futuristic design with blistering pace. Her high-performance drivetrain is supported by triple foils and embedded solar cells on the hardtop. Advanced hydrodynamics and latest AI management make for a stable ride which always remains comfortable.

Why Silent Yachts

A sensible approach to yachting which works in self-sufficient harmony with nature and creates a completely new experience on board.

New Silent Drivetrain

Tech shorts 2023

Electric power event on the water

Shipyard tour Italy by Michael & Heike

What is the range of a solar electric yacht?

Where are Silent yachts built?

“The Tesla of the seas! An amazing founding couple, a highly innovative product as well as a really cool story behind it. Furthermore, a lot of love and attention has been invested into every single detail – truly impressive!” Frank Thelen / TV Personality, Founder, Angel Investor & Disruption Expert

While the present has brought us the dawn of smart cars, I strongly believe the future will bring us solar powered smart boats – and I definitely want to be at the frontline of that journey. Michael Jost / Former Head of Group Strategy of Volkswagen Group

The idea of sailing while charging your own battery is super powerful to me – solar powered sailing is the perfect love story! Jochen Rudat / Former Tesla Central Europa Director, Advisory Board Silent Group

Elon Musk single handedly forced an entire industry to go electric, as a matter of fact if they don’t all go electric now they will soon die. I would like to see the same thing happening for boating. You are not just selling boats – you are the actual leading edge of a crucial and much overdue revolution to sustainable transport!” Klaus Obermeyer / Emmy Award Winner

I am completely excited about solar catamarans. I knew before they are great but now I truly believe this is the future. After so many boats I’ve seen in over 18 years with Boote Exclusiv, this yacht truly blew my mind. Such a silent and peaceful cruising experience – just the way it should be. Martin Hager / Editor in Chief for Boote Exclusiv - Yachts

Recommended water toys, accessories and products to enhance every Silent voyage:

6 Awesome Solar Boats for Eco Sailing in 2024 (Guide)

Liza pivoted from environmental consulting and doing impact assessments to writing about her two most counter-intuitive but passionate interests: sustainability and the importance of living an eco-conscious life; and marketing, martech, and AI. When she’s not writing, you can find her living a zero-waste-adjacent life in South Africa, falling down research rabbit holes on the internet, or out hiking with her dogs.

Introduction

Liza Shuttleworth pivoted from a career in environmental impact assessment and consulting to becoming a full-time writer, focusing on her most passionate (and diverse) interests: ecological conservation, sustainability, waste management and marketing, mar-tech, and AI.

Her professional portfolio reflects a diverse array of writing and consultancy roles spanning environmental science, marketing, and technology.

She has written for prestigious online and print publications on topics that include sustainability, climate change advocacy, waste management, and marine conservation, as well as marketing strategy, mar-tech, and the proliferation of AI tools for marketing.

Liza has an extensive professional background, having held management and consultancy positions within the environmental science, waste management, technology, and marketing sectors.

Her writing and editorial positions for both print and online publications have shaped content in ways that educate and inspire readers about sustainable living, climate change, and the power of innovative technology to overcome challenges in any setting.

Liza's academic background is rooted in a Bachelor of Social Science, focusing on Media and English. Beyond this, she has pursued tertiary qualifications in geography, psychology, and marketing, further enriching her knowledge base and contributing to her multi-faceted approach to writing and advocacy.

Solar boats are becoming a hugely popular choice for eco-friendly sailing. They’re quiet, can sail great distances without needing to stop for fuel, produce no carbon emissions, and do not rely on fossil fuels.

The popularity of solar-powered boats represents an evolution in marine transportation in favor of renewable energy and sustainability. Solar-powered boats provide a window into a future where clean, emission-free transport is not only possible but also preferred, due to developments in solar technology and design.

Solar boats are the ultimate of innovation and environmental responsibility, whether they are being used for peaceful journeys along beautiful canals or for bold ocean expeditions.

We reduce our dependency on scarce fossil fuels and lessen the ecological effect of traditional boating techniques by using the sun’s power to move us over the sea. Solar boats have the potential to completely transform the maritime sector and open the door to a more environmentally conscious and sustainable future for all, especially as the demand for eco-friendly alternatives keeps rising.

So, how do solar boats work? What are the benefits? And what are the best solar boats on the market? 

In this guide, we explain how solar boats function, the advantages of using them, and six impressive solar boats you can purchase in 2024.

Let’s dive right in!

Table of Contents

How Do Solar Boats Work?

In recent years, solar panel and rechargeable battery technology have improved dramatically. Panels are lighter, stronger, and more efficient.

Batteries are more compact, more efficient, and weigh considerably less than they did in the past. Both batteries and panels now last longer and cost less than they used to.

These advances in technology and a growing interest in eco-friendly sailing have shifted the development of solar yachts from idealists’ dreams to the mainstream.

So, how exactly do solar boats work? 

Solar boats use solar energy to power their motors, navigation systems, and onboard electronics, and appliances.

The solar system works much the same as a solar system on a house or RV , with some structural differences to meet the unique demands and challenges of a marine environment.

Solar panels mounted on the boat harvest solar power from the sun and send it to a charge controller , which controls the flow of electricity to a bank of rechargeable (usually lithium-ion) batteries.

From the batteries, power is sent to the electric motors, navigation systems and appliances via an inverter, which converts direct current (DC) to alternating current (AC). Most appliances like kettles, microwaves, and hair dryers use AC.

A solar system can be added to any boat, making it a hybrid or even just to supplement a little power using a renewable resource.

S olar is a great way to reduce your carbon emissions, reduce your fuel costs and increase the distance you can sail without stopping to refuel .

However, if you’re looking to buy a solar boat that is designed and built specifically for solar sailing, there are some really great options to consider.

What are the Benefits of Using a Solar Powered Boat?

When it comes to solar boats, there are some great benefits and they’re not limited to renewable energy and fewer carbon emissions:

• No reliance on fuel – diesel generators can be used as an emergency back up but they’re not needed for everyday sailing or electricity generation.
• Unlimited range: when batteries are constantly recharged by the sun, there is no need to stop to refuel and you can keep going indefinitely.
• No noise and no fumes: as there is no engine, there is no noise and no diesel fumes. This makes the experience of sailing a solar boat much more peaceful.
• No pollution: on a solar boat, there is no engine producing noise pollution, no carbon or greenhouse gas emissions , and no risk of fuel or oil spills.
• More space: the absence of engines frees up a lot of space. Electric motors and batteries can be housed anywhere on the boat and do not take up as much space as engines and machinery, which means room for more storage compartments to keep your gear or equipment.
• Lower running costs: beyond the initial investment and occasional maintenance, solar is completely free. This cuts out fuel costs and ongoing engine maintenance costs.
• Less maintenance: solar panels need to be cleaned regularly to be most effective but that is the only ongoing maintenance needed. Once a good solar system is installed, it generally needs very little maintenance.
• No limitations on electrical use: with solar, the supply is free and if you’re not pushing the motors to travel at speed you will often have more electricity than you need. This means you don’t need to watch your power consumption and you can run your air conditioning as much as you want!
• Options to sell power back to shore stations: if you regularly generate more power than you need from your solar, you can share it with others or sell it back to the grid at some shore stations.

The benefits you will enjoy from a solar boat vary, depending on your location and the specifications of the boat you choose. There are also some downsides, for example, solar boats are generally slower and the initial investment is quite high.

That said, solar boats are well worth the investment!

So, let’s look at some of the awesome solar boats available on the market in 2024:

6 Awesome Solar Boats

There are many great solar-powered boats to choose from and we have selected six of the best to feature here. We have chosen a range of sizes, styles, and price points so there should be something for everyone on this list!

1. Silent Yachts – Silent 55

The Silent 55 by Silent Yachts is one of their smaller solar yachts and can be handled by two people, with or without any additional crew.

It is spacious, and beautifully designed to be as economical as possible without losing any of the luxuries of their larger boats. With three to six cabins and all the amenities you can imagine, it offers everything you need to live on board permanently.

Check out this video by Kara and Nate to see their experience of the Silent 55 and meet the couple behind the iconic Silent Yachts company:

[embedyt] https://www.youtube.com/watch?v=iIte4FNI0U0[/embedyt]

Where to Buy: Silent Yachts

Price: From €1.97 Mio.

2. Serenity Yachts – Serenity 64

The Serenity 64 is a solar-powered hybrid yacht with a diesel engine. It can run on either, giving it a combination of unlimited range using solar or faster cruising using diesel.

It is a spacious and luxurious yacht, with plenty of living space and four cabins with en suite bathrooms.  The Serenity is the smaller of the two solar-powered boats offered by Serenity. The Serenity 74 is bigger and more luxurious, with an interior designed by Neiman Marcus Fashion Director Ken Downing.

Take a look at this video by Serenity Yachts to see more of the Serenity 64:

[embedyt] https://www.youtube.com/watch?v=ltyu-KPesg0[/embedyt]

Where to Buy: Serenity Yachts

Price: From $3.3 million

3. Sunreef Yachts – Eco 80 Sail Catamaran

Sunreef Yachts Eco sail catamarans take eco-friendly sailing to new heights. Their luxury solar yachts use a special ‘solar skin’ that covers any composite structure on the yacht to provide solar power from every angle.

They also use hydro and wind power to supplement the solar and have a sail. The green power generated on their innovative solar boats is enough to propel the boat, run all the onboard appliances and charge the electric water toys.

Taking their commitment to the environment up a notch, they use recycled and reclaimed materials, non-toxic paints, and natural fibers.

Check out the video below by SUNREEF YACHTS OFFICIAL on a day aboard the Sunreef 80 Eco Catamaran:

[embedyt] https://www.youtube.com/watch?v=hXFg1R1qcgI[/embedyt]

Where to Buy: Sunreef Yachts Eco

Price: Price on Request (depends on the custom specifications)

4. Soel Yachts – Soel Senses 48

The Soel Senses 48 is a 48ft solar electric catamaran. It was designed to be solar-powered and is slender and lightweight to make it more economical.

There are two sleeping berths for two people each, and another four people can sleep in the salon. The interior and the exterior are both sleek and modern.

Everything on the Soel Senses 48 has been designed thoughtfully to make it as comfortable and functional as possible. It is faster than other solar yachts, due to its smaller size and innovative design.

Check out this video by Jim Waltz to see a little more of the Soel Senses 48:

[embedyt] https://www.youtube.com/watch?v=t5IOCWPwGXY[/embedyt]

Where to Buy: Soel Yachts

5. Azura Marine – Aquanima 40

The Aquanima by Azura Marine is powered entirely solar and features some innovative adaptations that make it even more economical and eco-friendly. For example, rainwater collection from the solar panels on the roof and the fact that excess solar can be sold back to shore stations.

The Aquanima is beautifully designed and the interior is clean and modern. It has two double guest cabins and two single crew cabins. It is one of the most cost-effective options if you’re looking for a purely solar-powered boat.

Take a look at this video by Azura Marine to see the Aquanima in action:

[embedyt] https://www.youtube.com/watch?v=X25IRdHoHqI[/embedyt]

Where to Buy: Azura Marine

Price: From €523,000

6. Silent Yachts – Silent 80 Tri-Deck Solar Catamaran

The Silent 80 Tri-Deck Solar Catamaran is a superyacht that is completely customizable. It offers huge amounts of space, with three decks that can be customized to suit the owner’s needs.

The top deck can be open or enclosed and can be used as additional living space or a luxury master suite, opening onto a private outdoor space. Both open and closed versions include four to six customizable cabins.

As a solar-powered yacht, it has more space where the engines would normally be and that storage space can be used to house water toys and additional recreational equipment.

Check out this video by Yachts For Sale to see more on the Silent 80 Tri-Deck Catamaran, how it is built and what sets it apart:

[embedyt] https://www.youtube.com/watch?v=KCZMzE5Q8lc[/embedyt]

Price: From €5.51 Mio.

Final Thoughts on Solar Boats

As solar and battery technology has improved, and boat owners have become more conscious of their environmental impact, solar boats have become both more viable and more desirable.

Modern solar boats, from small solar-powered yachts to solar superyachts, are equipped with state-of-the-art technology to make them economical, easy to maintain, and a pleasure to use.

They’re also becoming increasingly affordable, and we hope, will be a mainstream option available to every eco-conscious sailor soon!

Electrek: I Drove A Rare Solar-Electric Yacht to Test Clean-Sea Propulsion, Here’s How It Went

Environmental Protection: The Environmental Impacts of Boating

Custom Marine Products: A Cruiser’s Guide to Selecting and Sizing a Solar Charging System

Forbes: Solar-Powered Yachting: A Look Inside ‘The Tesla of Yachts’

Knysna Yacht Company: Top Things to Know About Yacht Solar Power

Robb Report: How Zero-Emission, Solar-Powered Yachts Entered Boating’s Mainstream

Robb Report: Solar-Powered Yachts Are Taking Over. Here’s Why That’s a Good Thing

The Land Between: Recreational Boating and the Environment – Tips and Tricks for Environmentally Conscious Boating

Yachting Monthly: Sailing with Solar Power: A Practical Guide

Frequently Asked Questions

How does a solar boat work.

Solar boats use renewable energy from the sun to run their motors, electrical systems, and onboard appliances. They do not use petrol/diesel generators or engines and meet all their power needs using solar panels and batteries. Read the full guide for more details on how a solar boat works.

What are solar boats used for?

Solar boats are used for any boating purpose but they’re most frequently used for recreational sailing, such as yachts and catamarans, as ferries and tour boats, or as houseboats. Solar boats are generally slower and less powerful than fuel-powered boats. In situations where speed is needed, solar is usually supplemented with wind-sail or fuel-driven motors. Read the full guide for more on solar boats.

What is a solar yacht?

A solar yacht is a yacht that uses solar energy to power its electric motors and all the electronic equipment on board. Solar yachts do not rely on diesel or petrol engines and run solely on solar power. They do sometimes have other power sources, like backup diesel generators or engines. Read the full guide for more on solar yachts.

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Solar Yachts, A Very Bright Idea

Tens of thousands of years ago, humankind discovered that standing on a log and pushing with a stick would allow a person to cross a pond or a shallow lake. The push pole evolved into an oar, and we ventured across seas and along coastlines. Some genius figured out how to sail with the wind, and we crossed oceans.

We assumed for eons that maritime propulsion had evolved to its ultimate destiny. Then came the Industrial Revolution. Over several decades, Eli Whitney invented the steam engine and Etienne Lenoir, Nicholas Otto, and Rudolf Diesel all invented versions of an internal combustion engine. Throughout the last century, either the wind or a petroleum fired mechanical engine provided propulsion for pleasure craft.

The Solar Revolution is upon us. The yachting community and the maritime industry are actively adopting the next step beyond petroleum powered propulsion. Solar yachts, vessels propelled by the sun, are showing up in ports and marinas around the world.

What defines a solar yacht?

Any pleasure vessel using electricity derived from solar panels as a primary or alternative source of power for propulsion can be considered a solar yacht. Even if there are other propulsion systems aboard, the term “solar yacht” may be legitimately used. Consider that we call a vessel with masts and a “sailboat” even though there is typically another propulsion system available. The sails are seldom in constant use. Likewise, most solar yachts are not exclusively or constantly powered with electricity generated from photovoltaic cells.

Unique pleasures of solar and electric yachting

Sailors are more quickly prepared to appreciate the esthetic joys of traversing the waters at a leisurely pace. Imagine cruising where the cries of seabirds swirling overhead, the gentle slap of waves against the hull, and normal conversational tones are not drowned out by the 60, 70, or 80 decibel background drone of a rumbling diesel or thundering gasoline power plant. On an electric yacht, a shift in the wind doesn’t send everyone fleeing from the aft deck as exhaust smoke and fumes foul the air.

While a solar yacht will facilitate many happy experiences formerly reserved for sailors, there’s no need to scramble around the deck adjusting sails and rigging. No need to adapt to cruising “heeled over” at a 20 or 30-degree angle. No need to wait for the next opening of a drawbridge.

Solar yachts combine the ease of mechanical propulsion with the majesty of sail.

Limitations of solar yachts

Everything “under the sun” (pun intended!) has both advantages and limitations. The major limitations with solar powered yachts, compared with petroleum powered vessels, are range and speed. The hundreds or thousands of gallons of increasingly expensive fuel aboard a petroleum powered yacht provide a predictable, and often long range. The range comes at definite and measurable cost, as even moderate cruising speeds can burn more 3, 4 or more gallons per nautical mile. (One might observe that under sail range is unlimited- at least on those days when the wind is cooperating).

Very few builders are producing yachts relying exclusively upon solar power. Such vessels are recognizable by an oversized array of panels. Critics compare their appearance to an aircraft carrier defined by a huge flight deck, or a “floating solar farm.” The larger the square footage exposed to sunlight, the greater potential for electric power- but at some point, the sheer size becomes unworkable in close quarters and sea-keeping characteristics can radically change. Even with a 100% solar design, speed and range limitations remain.

According to leading scientific experts, the sun doesn’t shine at night. Just as sailboats rely on alternative power when the wind isn’t blowing, solar yachts will require an additional source of propulsion to allow operation after dark.

Solar yachts and current technology

Solar voltaic technology is rapidly advancing, but it’s likely that the industry remains decades away from any breakthrough technologies that will provide a 100% solar yacht with range and speed options comparable to contemporary petrol-powered vessels.

Fortunately, hybrid technology facilitates combining the benefits of solar yachting with the greater speeds and longer ranges of yachts powered solely by internal combustion engines. Everyone is familiar with hybrid technology in use by automobiles. Electric motors operate the vehicle at slower speeds, with an internal combustion on standby for longer distance and higher speed driving. The automotive and marine approaches to “hybrid” power are similar.

The largest commercial ships normally rely on a "serial" system, which uses diesel-driven generators to create electricity to energize motors turning the propeller shafts. In contrast, smaller vessels and private yachts use a “parallel” hybrid system, which uses two or more methods of propulsion to turn a prop shaft. Hybrid redundancy provides a margin of safety and convenience. Should one propulsion system fail for any reason, there’s “backup” available so a vessel can remain underway. Most solar yachts are configured as hybrids, with electricity from solar panels used to recharge batteries powering electric motors.

Greenline solar hybrid yachts

Greenline Yachts is the acknowledged leader in the solar hybrid yacht industry. While many builders have solar and hybrid powered boats “on the drawing board,” Greenline has launched more than 600 premium-quality vessels since establishment in 2009.

Greenline’s approach to solar yachts includes the reasonable and aesthetically pleasing use of solar panels on the upper surfaces of their boats. Energy from the photocells is transferred through a converter-charger to a large bank of lithium/ion batteries below decks- occupying the space where one would expect to find the large engines and fuel tanks on a petrol- powered yacht.

Greenline resolves speed and range considerations by employing small diesel engines driving the same shaft as the electric motors. Like the automotive application, the electric motors manage the slow speeds, and the diesel engines are called upon when higher speeds are desired. When the internal combustion portion of the hybrid system is in use, it provides an elevated level of DC power to quickly and efficiently recharge the storage batteries.

Solar cruising is now a reality

Greenline Yachts specify that their solar hybrid vessels can travel 20 nautical miles, up to 6 knots (sailing speed) without engaging the diesel-powered portion of the system at all. With an optional expanded lithium battery bank, a range of 40 nautical miles can be achieved. Many boaters who are not in a particular hurry to “get there” will discover that a 40 nautical mile range is more than adequate for local excursions on summer evenings, or even a weekend cruise to a nearby park or marina.

Most pleasure boaters spend more time on the water during the summer months. Days are much brighter and longer. More solar energy is available to rapidly recharge the batteries and extend the range of a solar yacht.

Solar yachts used primarily for cruising from one marina to another have access to an already existent charging network- the shore power pedestal at every slip. Lithium batteries charge in about half the time of old-fashioned lead/acid batteries. Lithium batteries can be discharged further, additionally extending range.

Solar yachts can enhance the experience when cruising to remote locations. Many docks at destinations in northern BC and Alaska, for example, have no shore power. Solar panels will keep the battery banks topped off to provide lights, refrigeration, and other essential needs no matter where one chooses to dock or anchor. No need to disturb the peace and tranquility by firing up a noisy generator.

There is, however, one destination that solar hybrid yachts won’t visit with any remarkable frequency: the local fuel dock.

For Additional Information

A highly select network of about sixty dealers, worldwide, represent Greenline hybrid yachts. In the Pacific Northwest, Ocean Pacific Yachts represents the line from their offices in Seattle, Washington. Contact us at 206-659-0710 for more details and to schedule a sea trial. Our sales team is considered an authoritative resource for answers to general questions about hybrid yachts and electric yachts.

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SUNPOWER VIP 44

The Sunpower 44 VIP Solar-Powered Catamaran features two 30kW high-efficiency motors that provide sustainable, comfortable cruising. Owners can expect a 6-7 knot cruising speed with top end speeds between 11 and 15 knots.

The Sunpower 44 VIP version features a master stateroom in the front starboard area with a full-length ensuite bathroom and an office. Portside, there are two guest cabins including one with two single bunks and one with a double berth. Both guest cabins share a bathroom. Customized versions of the Sunpower 44 can be created upon request. 

Special Features :

o Length overall: 13,40 m (44.0‘) o Beam overall: 7,20 (23.6‘) o Draft: .750 m (2.5‘) o Light displ. (EC): 22,000 Lbs. o Water: 250L – 1 Tank. o Waste-Water: 1 Tank x 250L o Fuel: 250L – 500L o Solar Generator: 9,000 Wp o E-Motors: 2 X 30KW / 2 x 80kW / 2 x 135kW o Generator: 22 kW / 100 kW o Cruising Speed: 6 – 8 kt / 6 – 10 kt o Top Speed: approx. 12 kt / 15 kt o CE Certification: A

For more information on Sunpower Yachts, please contact Wille McCormick at 561-301-8126 or at [email protected] . 

SPECIFICATIONS

• Make Sunpower Yachts
• Length Overall 44'
• Max Draft 2' 5
• Displacement 24,250 lbs. (Light)
• Water Capacity 2 x 54.9 Gallon Tanks

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What You Need To Know About Boat Solar Panels

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Sunshine and boats are a natural together, so why not use all that free energy? Here’s the lowdown on solar panel selection and installation

I first embraced the idea of solar power while up a pole (literally) in the Atlantic Intracoastal Waterway replacing dead batteries. It was the early 1980s, and I was maintaining buoys, beacons, and other such Aids To Navigation (ATON) for the U.S. Coast Guard, replacing massive, nonrechargeable batteries with rechargeable solar-powered ones. The higher-ups said the solar rechargeables would last six years – twice as long as the one-shot batteries. As the deck-ape in charge of lugging all those batteries up and down the ladders, my back and I immediately appreciated the whole “free power from the sun” thing, a concept I continue to embrace.

The strategy behind s olar energy onboard is simple: A solar panel converts sunlight into electricity, after which wiring conducts it to your batteries for storage until needed. Solar panels are used to keep batteries or banks charged rather than to power equipment directly. This arrangement allows the panels to store generated power whenever produced, while providing a steady source of power to a piece of equipment even when the panel is producing no power.

While they do require an initial outlay, solar panels can easily pay for themselves in money saved and independence gained over their service life. They’re noiseless, have no moving parts, and they provide free electricity for years with minimal maintenance. Solar panels also have the benefit of being modular, letting you start small and add more as your power requirements increase.

The benefits of solar

Almost any boat can benefit from solar power. Whether at a slip, mooring, or on a trailer, boats can keep their batteries topped off without the need for external power. You can also use solar power to supplement or even replace other onboard charging sources, reducing or eliminating the need to run engines or generators to keep batteries topped off (a wasteful practice that burns fuel while wearing down the costliest pieces of equipment onboard).

While underway, it’s a plus to be able to recharge a dead battery in an emergency – say, to operate a VHF radio or navigation gear. While dockside, solar panels keep batteries charged and vital systems (such as bilge pumps) up and running without the need for shore power.

Just about any boat can benefit from solar power, whether it’s to keep batteries topped off or supplement other onboard charging sources.

Mount solar panels where they are exposed to maximum sunlight but do not interfere with operation of the vessel. 

Bottom: Something as simple as the shadow of a line or shroud can reduce or halt output.

Types of panels

Solar panels contain photovoltaic cells – small silicon semiconductor devices that convert sunlight into electricity. Each cell generates between 0.45 and 0.5 volts, depending on exposure to direct sunlight. Cell size determines amperage, with a 3-inch cell producing roughly 2 amps, a 4-inch cell a little over 3 amps, and a 5-inch cell around 5 amps.

Construction-wise, the three main types of solar panels are monocrystalline, polycrystalline, and amorphous (or thin-film) technology.

Monocrystalline panels have been around the longest and remain the most popular. The panels are constructed of thin slices of crystal silicon (each cell is cut from a single crystal) housed in a rigid, aluminum frame and covered with tempered shatterproof glass. The panels have a uniform black, blue, or gray appearance and are generally quite rugged, although they can be cracked or broken if subjected to extreme abuse.

Monocrystalline panels have the longest service life of the three types. With a conversion efficiency of around 17%, they’re also the most efficient and have the highest electrical output per area, but they are also the most expensive.

Polycrystalline cells are sliced from a cast silicon block and have a shattered glass appearance. Built in much the same way as monocrystalline panels, they’re rectangular, giving the panel itself a tiled look. Their life span is similar to monocrystalline panels, and while their conversion efficiency is lower (by 14%), they’re also a bit less expensive.

Amorphous panels are made by placing a thin film of active silicon on a solid or flexible backing (such as stainless or aluminum sheeting) depending on whether the panel is to be rigid-framed and glass-fronted or flexible. Flexible amorphous panels, in which cells are sandwiched between rubber and polymer covers, are light and tough enough that you can walk on them and, in some cases, even roll them up for storage.

This type of solar panel is also better if shade is an issue. With crystalline panels, even the thin shadow of a rope or shroud across one cell can reduce or halt output of an entire module. Amorphous panels have “bypass” diodes that essentially turn off shaded cells and provide a current path around them. Some monocrystalline panels also have bypass diodes, but this feature comes at an increase in cost.

Amorphous panels are the least expensive of the three types, but their efficiency is also lower – around 8%, or roughly half that of a monocrystalline type. This lower output is somewhat mitigated in newer panels, however, which use three-layer construction. Each layer absorbs different colors of the solar spectrum, so the panel will deliver more power longer each day and during lower light conditions than the other two types.

The charge controller should be mounted below decks and as close to the battery as possible. 

Follow manufacturer instructions for wire connections.

Planning the system

While factors such as cost, mounting options, and output are important, a successful installation depends on knowing what you want the system to accomplish. Is the goal to float-charge a single battery or supplement an overall vessel energy plan? Answering these questions up front will help determine the type, size, and number of panels required.

To understand the process better, let’s walk through the basic steps to determine power requirements and installation considerations for a single solar panel installation. While the example itself is simple, the steps are the same used to plan more complicated installations.

For our example, the goal is to install a solar panel to provide charging for a single 12-volt, 100-amp-hour wet-cell battery used to power an automatic anchor light on a moored vessel.

The first step is compiling a daily power consumption estimate to determine how much solar power is needed.

The daily self-discharge rate for a wet-cell battery is roughly 1%, meaning our 100-amp-hour battery requires one amp every 24 hours just to maintain the status quo. The anchor light draws 50 milliamps per hour of operation, and we’ll assume it operates 10 hours each night. Multiplying current draw (50 milliamps) by hours of daily operation (10) generates a daily energy expense of 500 milliamps or .5 amps.

This means our solar panel must meet a minimum daily energy tab of 1.5 amps – one amp of battery self-discharge rate plus .5 amps of power draw for the anchor light.

Next up is figuring out panel size and the best mounting location. For our example, let’s assume the panel will be a horizontal, fixed-mount installation. A 10-watt horizontally mounted panel should generate between 3- and 5-amp hours per day.

We’ll need at least 13 volts to fully charge our 12-volt battery. As most solar cells generate at least 0.45 volts, you’ll want a panel with a minimum of 33 cells, which should provide around 14.85 volts.

Keep in mind that’s the minimum needed, which may not be enough once you factor in a few cloudy days. Most panels are designed to generate between 15 and 20 volts to overcome problems like cloudy days or inherent electrical resistance within the panel or installation components. While this higher voltage lets you make up for less electrically productive days, it also means you’ll want to install a solar charge controller (voltage regulator) to avoid battery damage due to overcharging.

Attempts to plan a system that tries to use the output of the panel and capacity of the battery to prevent overcharging (and avoid the installation of a charge controller) is false economy and should not be done. The system will never meet its full output potential and, worst case, can damage the battery due to overcharging.

A word on ‘charge controller confliction’

If your vessel has multiple charging sources, such as solar panels and a wind turbine, a crucial but often overlooked consideration is “charge controller confliction.” In short, this is an issue where the charge controller for your solar panel and the charge controller for your wind turbine are internally adjusted to the same maximum charge voltage set point. This means they are constantly fighting each other to be the dominant power source, which results in diminished overall charging output and performance. An in-depth article on this issue can be found at ­missioncriticalenergy.com (in the website footer, click “Superwind Turbine Manuals & Technical Bulletins.” Under the header “Charge Controllers,” select the document “Resolving Charge Controller Confliction”).

While this article addresses charge controller confliction at remote, off-grid sites, the information provided is also applicable to vessel installations. — F.L.

Location and mounting

Solar panels should be mounted in a location where they are exposed to the maximum amount of sunlight but do not interfere with operation of the vessel or the movement of passengers and crew. Solar panels will typically be either fixed or mounted on some type of movable bracket that allows you to actively point the panel toward the sun for maximum output. Both methods have their pros and cons. Fixed panels (which are normally mounted horizontally) don’t produce as much power as a panel that can be adjusted to face the sun. The downside is that adjustable panels must be aimed throughout the day to maximize their output.

Use good quality, marine-grade heat shrink connectors (top) and liquid electrical tape (right) to create airtight, waterproof seals and reduce corrosion.

Installation

After choosing and mounting your panel, it’s time to connect it. The first thing you need to determine is the size (gauge) of the wiring to be used. Multiply your panel’s rated amp output by 1.25 (which adds a 25% safety factor). Then measure the length of the entire wiring run, panel to battery, and multiply by 2. Once you have these two numbers, refer to the American Boat and Yacht Council’s (ABYC) 3% voltage-drop table for wire size. Ancor Products offers a handy wire calculator on its website ( ancorproducts.com/resources ).

Always use good quality marine grade connectors  and tinned, multi-stranded copper wire with vinyl sheathing. The wire will run from the solar panel to the charge controller first, then to the battery. Try to keep the wire run as short as possible, and if it transits an external deck or cabin house (it likely will), be sure to use an appropriate weatherproof deck fitting.

The charge controller should be mounted below decks and as close to the battery as possible. You’ll always want to follow the manufacturer’s instructions for connections, but in a typical installation you’ll connect the solar panel’s positive (red wire) lead to the charge controller’s positive input wire or terminal and the negative (black wire) lead to the charge controller’s negative input wire or terminal.

Next, connect the charge controller’s negative output to the battery negative terminal and the controller’s positive output to the battery’s positive terminal via an appropriately sized in-line fuse (or circuit breaker). ABYC recommends these be installed within 7 inches of connection to the battery or other point in the DC system. To reiterate, the installation of the charge controller can vary among models, so follow the manufacturer’s installation instructions.

Finally, ensure all connections are waterproof and secure any loose wire runs with wire ties and cable clamps for a neat installation. Then get ready to lean back and soak up some free sun.

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Frank Lanier

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Capt. Frank Lanier is a SAMS Accredited Marine Surveyor with more than 40 years of experience in the marine and diving industries. He’s also an author, public speaker, and multiple award-winning journalist whose articles on boat maintenance, repair, and seamanship appear regularly in numerous marine publications worldwide. He can be reached via his YouTube channel “Everything Boats with Capt. Frank Lanier” and website captfklanier.com.

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More From Forbes

Candela’s all-electric-powered hydrofoiling passenger ferry poised to transform global ferry transportation.

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The all-electric-powered Candela P-12 ferry flies over the water on hydrofoils

I would never say “I told you so,” but…now that Candela , the world’s leading producer of all-electric-powered hydrofoiling boats, has just closed the largest funding round in the company's history, I might be bold enough to say…”I’m not surprised.”

That’s because I’ve been closely following the development of this wonderfully smart company’s hydrofoiling boats since I test flew a P-7 near their small and efficient shop in Stockholm in 2021. So, I’m really not surprised they just raised over $25 million to expand production of their game-changing P-12 ferry. And since yacht building powerhouse Groupe Beneteau is a key partner in the largest fundraising round Candela has ever completed it appears Candela’s brand of tech-controled hydrofoiling is about to go global.

“Our investment perfectly aligns with Groupe Beneteau‘s ecological transition objectives, scaling up innovative solutions for more sustainable boating and unparalleled experiences,” says Bruno Thivoyon, CEO of Groupe Beneteau, the world's largest boat manufacturer (15 factories, 9 brands, and more than 8,000 yachts built annually) with a total revenue of over $1.5 billion in 2023. “Candela’s technology, enabling significantly more efficient electric vessels, will transform waterborne transport into its next sustainable phase.”

A Candela P-8 and P-12 underway near Stockholm, Sweden

“We couldn’t be more excited about having Groupe Beneteau on board,” says Gustav Hasselskog, Founder and CEO of Candela. “As the leading global boat company, their trust is a stamp of approval for our technology to transform waterborne transportation. We’re excited for the possibilities ahead."

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The new investment round will help to scale up production to meet demand for the recently launched Candela P-12, the world’s first electric hydrofoil ferry. The P-12 is the first fast and long-range electric ferry on the market. Its efficient hydrofoil technology cuts lifetime emissions by 97.5% compared to diesel vessels, while simultaneously allowing operators to save up to 50% in operating costs. Since it generates minimal wake, the P-12 has been granted exemptions from speed limits, as for example on its maiden route in Stockholm, where it from July will cut travel times in half compared to road transport and legacy diesel vessels.

And it’s pretty obvious Hasselskog and company are on the right track. According to some projections the market for electric vessels is expected to be worth $14.2 Billion USD in 2030.

“We’ve spent years developing the technological maturity, and now we’re fit for scaling to commercial vessels. As in any industry, the fastest-scaling company will dominate the market,” says Hasselskog.

The Candela P-8 and P-12 hardly make a ripple as they fly over the water on computer-controlled ... [+] hydrofoils

Other backers in the round include longtime investors EQT Ventures , Ocean Zero LLC , and Kan Dela AB. The new investment brings total funding since Candela’s inception to over $75 million.

“EQT Ventures has steadfastly backed Candela's vision to accelerate the shift towards fossil fuel-free lakes and oceans since 2021. The launch of Candela's P-12 vessels signifies a watershed moment in sustainable transport", says Lars Jörnow, Partner at EQT Ventures.

The only question is: when will we see a P-12 ferry here in the US?

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Electric boats

Electric yachts, this new solar electric yacht with its own spa pool and theater awaits you.

Renowned luxury yacht maker, Sunreef, released plans for a new 108-ft (33-m) solar-powered electric superyacht complete with its own pool spa and indoor theater. Did I mention it’s also fully autonomous?

Best known for its comfort, stunning beauty, ultra-luxurious accommodations, and high performance, Sunreef continues to push the boundaries with its luxury catamarans.

Sunreef is well known around the world for its luxury sailboats, power catamarans, and superyachts, with customers including Tennis superstar Rafael Nadal.

On Friday, the company revealed its latest superyacht, the 33M Sunreef Explorer Eco. Sunreef says the new model “rewrites the rules with bold architecture and a fresh approach to travel.” Perhaps most importantly, the 100-ft-long yacht travels silently without harmful fumes or vibrations.

Powered by two 400-kW electric motors, a 990-kWh battery pack system, and two 300-kW range extenders, the 33M Sunreef Explorer Eco “was designed to take you to the most remote cruise grounds in silence.” However, no specifics were mentioned on the range yet.

Made from aluminum and advanced composite materials, the electric yacht’s design maximizes the space for harnessing solar energy.

With included solar panels built into the hulls, superstructure, bimini roof, and entire full-beam bow terrace, the electric superyacht’s photovoltaic system can generate up to 50 kWp of clean solar energy.

The 33M Sunreef Explorer Eco enhances efficiency with energy-saving air conditioning and a smart energy recovery system. It also features a rainwater collection system, water-saving traps, watermakers, and an ultra-efficient boiler using heat recovery.

On the inside, you will be blown away by the vastness of the 535 m² of living space that can be customized to include a spa, a library, or a gym.

It also has space for ten guest rooms and seven crew members. The large main suite has an outdoor deck area, while the level below it features an outdoor pool, bar, and dining area.

This is luxury living at its finest with no emissions. What do you guys think? Are you ready for Sunreef’s new solar electric superyacht? Although the price is not yet listed, you can imagine how much it will cost for all of this.

FTC: We use income earning auto affiliate links. More.

Peter Johnson is covering the auto industry’s step-by-step transformation to electric vehicles. He is an experienced investor, financial writer, and EV enthusiast. His enthusiasm for electric vehicles, primarily Tesla, is a significant reason he pursued a career in investments. If he isn’t telling you about his latest 10K findings, you can find him enjoying the outdoors or exercising

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The Jackery Solar-Powered Generator Comes With Two Solar Panels—and It’s 39% Off at Amazon

It has eight ports to keep all your gear charged when you go off-grid this camping season.

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us?

Jackery Solar Generator 1000 with 2x SolarSaga 100W Solar Panels

Two of our editors tested the Jackery Explorer 1000, concluding that the brand’s solar-powered generator lives up to its reputation as the go-to model for car campers, remote workers, and overlanders. Maggie Slepian , a freelance writer and outdoor industry vet, tested the device during a winter camping trip. Meanwhile, Popular Mechanics test editor, Brad Ford , provided input following thorough at-home testing.

“I used it on a media trip where we had to keep multiple camera batteries charged during a week-long outing... We charged our photographer’s camera batteries while we were charging the power bank on solar power (it was a very sunny winter day), which proved effective and efficient,” says Slepian.

Jackery’s solar-powered generator features a 1002-watt-hour (Wh) power bank capable of producing 1000 watts of output power, with a peak of 2000 watts. It’s suited for charging personal electronics like a smartphone , laptop , or camera battery, yet powerful enough for small appliances, including a mini-fridge or coffee maker , allowing you to enjoy some creature comforts while off the grid. There are eight ports, including two AC outlets, two USB-C ports, two USB-A ports, and a 12-volt carport.

When you’re enjoying the warmer weather of spring, you can charge the Explorer 1000 with the included pair of 100-watt solar panels from Jackery. Together, they can replenish the generator’s battery in as little as 6 hours. The kit will give you the freedom to go off-grid and stay there without sacrificing a reliable power source.

As good as the Explorer 1000 is for outdoor use, it’s just as good indoors. During an emergency, the solar-powered generator can power your lights and, crucially, your TV, so you can watch your favorite movie as you ride out an outage. Since solar-powered generators like the Explorer 1000 don’t emit carbon dioxide, they’re safe to use indoors, unlike our favorite gas-powered generators .

Jackery has an entire lineup of solar-powered generators for use during emergencies, camping trips, and construction sites. The Explorer 240 , our favorite budget-friendly option, is also available at a discount if you want something smaller. It weighs less than 7 pounds and is about the size of a small cooler, making it easy to pack during a road trip.

Brandon Russell is a freelance writer covering gear and technology. He started his journey as a news writer at a small newspaper and later began reviewing smartphones, movies, and video games. In his free time, he enjoys the slower, more intentional experience of using a 35mm film camera and making short videos about movies he grew up watching.

Brad Ford has spent most of his life using tools to fix, build, or make things. Growing up he worked on a farm, where he learned to weld, repair, and paint equipment. From the farm he went to work at a classic car dealer, repairing and servicing Rolls Royces, Bentleys, and Jaguars. Today, when he's not testing tools or writing for Popular Mechanics, he's busy keeping up with the projects at his old farmhouse in eastern Pennsylvania.

Maggie Slepian is a full-time freelance writer in the outdoor industry and has tested gear professionally for almost ten years—she is an avid backpacker, trail runner, bikepacker, and horseback rider and has thru-hiked thousands of miles on the Appalachian, Colorado, and Ouachita trails, along with backcountry travel on terrain including coastal trails, the desert, and high alpine peaks. Maggie has written for New York Magazine, Huffington Post, REI, and Outside. She is a columnist with Backpacker Magazine and is the co-founder of BackpackingRoutes.com. Contact her at MaggieSlepian.com.

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