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The Promises and Pitfalls of an All-Electric Yacht

• By Tim Murphy
• Updated: November 8, 2021

This past October, I saw one of the most interesting exhibits in more than 500 new cruising sailboats I’ve reviewed over two decades. It was the Arcona 435Z, built in Sweden and introduced by Graham Balch of Green Yachts in San Francisco. Balch describes his business as “a new brokerage dedicated to the electric revolution on the water,” and it was the “Z” in the boat’s name, which stands for “zero emissions,” that made this boat so interesting. This was the first electric propulsion system—not hybrid but all-electric —I’d ever seen on a cruising sailboat.

Electric propulsion isn’t new. Since 1879, electric motors have propelled boats; a fleet of some four-dozen electric launches transported visitors around the 1893 Colombian Exposition in Chicago. But cruising sailboats are not launches, and the open sea is not a protected canal. When we’re using cruising boats as they’re meant to be used, they seldom end their day plugged into a shore-power outlet. Cruising boats comprise many devices —stove, refrigerator, freezer, windlass, winches, autopilot, radar, lights—whose power typically comes from a tank of fossil fuel. And today’s cruising sailors are accustomed to using diesel auxiliary power to motor through lulls or punch into headwinds and seas.

Starting about 15 years ago, we saw a wave of diesel-electric and hybrid propulsion systems on production and custom cruising boats ( see “Perpetuated Motion,” CW , March 2005 ). Both of those systems ultimately start with an onboard internal-combustion engine. A diesel-electric propulsion system relies on a running genset to directly power the electric motor that turns the propeller. A hybrid system relies on batteries to power the electric motor, plus an internal-combustion genset to recharge the batteries. One of the promises of a hybrid system is the ability to regenerate electrical power. Regeneration means using boatspeed under sail to turn the propeller, whose spinning shaft sends electrons from the electric motor back through an electronic controller to recharge the batteries. In such a system, the boat’s propeller is both an electrical load (when running under power) and a charging source (when sailing in regeneration mode).

The Arcona 435Z was different from both of these systems: It incorporates no onboard fossil-fuel engine at all. Instead, it has a bank of lithium batteries, several solar panels, and a proprietary propulsion leg that looks like a saildrive. “This boat,” Balch said, “has the very first production unit in the world of Oceanvolt’s newest electric propulsion system, called the ServoProp.”

For our sea trial, Balch was joined by Derek Rupe, CEO of Oceanvolt USA. “If you can sail the boat and you have some solar, you can go anywhere in the world, and you can make all your power underway while you go,” Rupe said. When we spoke in October 2020, he touted three high-profile sailors who were using the Oceanvolt electric propulsion system: Alex Thomson, for his Hugo Boss Open 60 Vendée Globe program; Jimmy Cornell, for his Elcano 500 expedition; and Riley Whitelum and Elayna Carausu, who had been teasing their new boat for months on their popular Sailing La Vagabonde YouTube channel.

The efficiency of Oceanvolt’s ServoProp and the regeneration from it is the promised game-changer in each of these boats. The ServoProp is a leg with a ­feathering propeller that can be set for optimal pitch in three modes: forward, reverse and regeneration.

“You don’t need fuel,” Rupe said. “You don’t need to dock; you can go anywhere you want to go and always have the power for living and propulsion.”

That’s the promise. But are there also pitfalls?

Innovation and Risk

Marine electric propulsion is an emerging technology. Compared with the mature and settled technology of diesel engines and lead-acid batteries, electric-propulsion systems—with their electronic controllers and lithium batteries—are in a stage of development best described as adolescent. Every sailor has his or her own tolerance for technical innovation. For the promise of fewer ­seconds per mile, grand-prix-racing sailors willingly trade a high risk of expensive damage to the sails, rig or the boat’s structure itself; cruising sailors, by contrast, tend to favor yearslong reliability in their equipment as they seek miles per day.

Folks who identify as early adopters take special joy in the first-wave discoveries of a new technology; if they’re clear-eyed about supporting an ongoing experiment, they see themselves as partners with the developers, accepting failures as opportunities for learning. Sailors motivated primarily by changing the trajectory of climate change might be especially willing to modify their behavior to limit their own output of greenhouse gases. Investing in any emerging technology asks you to start with a clear assessment of your own risk tolerance. We’ll return to this theme with one or two real-life examples.

The American Boat and Yacht Council, founded in 1954, sets recommended standards for systems installed on recreational boats. For decades, ABYC has published standards related to installations of diesel and gasoline engines, as well as electrical systems based around lead-acid batteries. By contrast, it was only three years ago that ABYC came out with its first electric-propulsion standard (revised July 2021). And only last year it published its first technical-information report on lithium batteries (a technical-information report is an early step toward a future standard). The takeaway is that if you need help servicing your diesel engine or electrical system built around lead-acid batteries, you can pull into any reasonable-size port and find competent technicians to help you. With electric propulsion and lithium batteries, that pool of skilled talent is significantly scarcer.

To say that a technology is mature simply means that we’ve learned to live with it, warts and all, but that it holds few remaining surprises. Certainly, diesel-propulsion and lead-acid-battery technologies each leave plenty of room for improvement. When a charge of fuel ignites in the combustion ­chamber of a diesel engine, some three-quarters of the energy is lost in heat and the mechanical inefficiencies of converting reciprocating motion to rotation. Lead-acid batteries become damaged if we routinely discharge more than half of their capacity. During charging, they’re slow to take the electrons we could deliver.

Lithium batteries are comparatively full of promise. Their power density is far greater than that of lead-acid batteries, meaning they’re much lighter for a given capacity. They’re capable of being deeply discharged, which means you can use far more of the bank’s capacity, not merely the first half. And they accept a charge much more quickly; compare that to several hours a day running an engine to keep the beers iced down.

But the pitfalls? Let’s start with ABYC TE-13, Lithium Ion Batteries. Some of its language is bracing. “Lithium ion batteries are unlike lead-acid batteries in two important respects,” the report says. “1) The electrolyte within most lithium ion batteries is flammable. 2) Under certain fault conditions, lithium ion batteries can enter a condition known as thermal runaway, which results in rapid internal heating. Once initiated, it is a self-perpetuating and exothermic reaction that can be difficult to halt.”

Thermal runaway? Difficult to halt? Self-perpetuating?

“Typically, the best approach is to remove heat as fast as possible, which is most effectively done by flooding the battery with water,” TE-13 continues, “although this may have serious consequences for the boat’s electrical systems, machinery, buoyancy, etc.”

If you were following the news in January 2013, you might remember the ­story of Japan Airlines Flight 008. Shortly after landing at Boston’s Logan Airport, a mechanic opened the aft ­electronic equipment bay of the Boeing 787-8 to find smoke and flames billowing from the auxiliary-power unit. The fire extinguisher he used didn’t put out the flames. Eventually Boston firefighters put out the fire with Halotron, but when removing the still-hissing batteries from the plane, one of the ­firefighters was burned through his ­professional protective gear.

Samsung Galaxy cellphones, MacBook Pro laptops, powered skateboards—in the past decade, these and other devices have been recalled after their lithium batteries burned up. In that period, several high-end custom boats were declared a total loss following failures from lithium batteries. In March 2021, a 78-foot Norwegian hybrid-powered tour boat, built in 2019 with a 790 kW capacity battery bank, experienced thermal runaway that kept firefighters on watch for several days after the crew safely abandoned the ship.

Yes, experts are learning a lot about how to mitigate the risks around lithium batteries. But we’re still on the learning curve.

ABYC’s TE-13 “System Design” section starts, “All lithium-ion battery ­systems should have a battery ­management system (BMS) installed to prevent damage to the battery and provide for battery shutoff if potentially dangerous conditions exist.” It defines a bank’s “safe operating envelope” according to such parameters as high- and low-voltage limits, charging and discharging temperature limits, and charging and ­discharging current limits.

Graham Balch takes these safety recommendations a step further: “To our knowledge, the BMS has to monitor at the cell level. With most batteries, the BMS monitors at the module level.” The difference? “Let’s say you have 24 cells inside the battery module, and three of them stop working. Well, the other 21 have to work harder to compensate for those three. And that’s where thermal events occur.”

Balch followed the story of the Norwegian tour boat this past spring. He believes that the battery installation in that case didn’t meet waterproofing standards: “The hypothesis is that due to water intrusion, there was reverse polarity in one or more of the cells, which is worse than cells simply not working. It means that they’re actively working against the other cells. But if the BMS is monitoring only at the module level, you wouldn’t know it.”

On the Green Yachts website, Graham lists five battery manufacturers whose BMS regimes monitor at the cell level. “If I were sailing on an electric boat, whether it be commercial or recreational, I would feel comfortable with having batteries from these five companies and no other,” he said.

The broader takeaway for today’s sailors is that lithium batteries bring their own sets of problems and solutions, which are different from those of conventional propulsion and power-supply technologies. A reasonably skilled sailor could be expected to change fuel filters or bleed a diesel engine if it shuts down in rough conditions. With lithium-ion batteries aboard, an operator needs to understand the causes and remedies of thermal runaway, and be ready to respond if the BMS shuts down the boat’s power.

Real-World Electric Cruising Boats

When we met Oceanvolt’s Derek Rupe a year ago, he and his wife had taken their all-electric boat to the Bahamas and back the previous season. Before that, he’d been installing electric-propulsion packages for six years on new Alerion 41s and other refit projects. “My real passion is on the technical side of things—installations, really getting that right. That’s half the picture. The technology is there, but it needs to be installed correctly.”

When talking to Rupe, I immediately encountered my first learning curve. I posed questions about the Oceanvolt system in amps and amp-hours; he responded in watts and kilowatt-hours. This was yet another example of the different mindset sailors of electric boats need to hold. Why? Because most cruising boats have just one or two electrical systems: DC and AC. The AC system might operate at 110 or 220 volts; the DC side might operate at 12 or 24 volts. On your own boat, that voltage is a given. From there we tend to think in terms of amps needed to power a load, and amp-hours of capacity in our battery banks. Going back to basics, the power formula tells us that power (watts) equals electrical potential (volts) times current (amps). If your boat’s electrical system is 12 volts and you know that your windlass is rated at 400 watts, it follows that the windlass is rated to draw 33 amps.

But an all-electric boat might comprise several systems at different voltages. A single battery bank might supply cabin lights at 12 volts DC; winches and windlasses at 24 volts DC; the propulsion motor at 48 volts DC; and an induction stove, microwave and television at 110 volts AC. A DC-to-DC power converter steps the voltage up or down, and an inverter changes DC to AC. Instead of translating through all those systems, the Oceanvolt monitor (and Derek Rupe) simply reports in watts coming in or going out of the bank.

“We keep all our thoughts in watts,” Rupe said. “Watts count in the AC induction. They count in the DC-to-DC converter. They count the solar in. They count the hydrogeneration in. And the ­power-management systems tracks it that way for shore-power in.

“On a boat like this, maybe I have 500 watts coming in the solar panels,” he continued. “So then I can think: ‘Well, my fridge is using 90 watts. My boat has an electric stove. When I cook a big meal, I can see that for every hour we cook, we lose about 10 to 12 minutes of our cruising range.’”

During his Bahamas cruising season, Rupe observed that on days that they were sailing, the combination of solar panels and hydroregeneration supplied all the power he and his wife needed. “When we weren’t sailing,” he said, “we found that we were losing 8 percent each day, in the difference from what the sun gave us to what we were using for the fridge, lights, charging our laptops, and all that stuff.”

Rupe’s solution? “Twice in Eleuthera and once outside Major’s, we went out and sailed laps for a couple of hours because the batteries were below 30 percent of capacity. It was good sailing, and the wind was coming over the shore, so we didn’t have any sea state. We did a couple of hot laps on nice beam reaches, and generated about 700 watts an hour.”

Of the three sailors Rupe touted in October 2020—Alex Thomson, Jimmy Cornell and the Sailing La Vagabonde couple—only Cornell can report back on his all-electric experiences with Oceanvolt. Alex Thomson ended his circumnavigation abruptly last November, just 20 days after the Vendée Globe start, when Hugo Boss collided with an object in the South Atlantic. And at press time in early fall 2021, Riley and Elayna had just recently announced the build of their new Rapido trimaran; keep an eye on their YouTube channel for more about their experiences with the Oceanvolt propulsion system.

As for Cornell—circumnavigator, World Cruising Routes author, creator of the transoceanic rally, and veteran of some 200,000 ocean miles—he suspended his planned Elcano 500 round-the-world expedition solely because of the Oceanvolt system in his new Outremer catamaran. His Aventura Zero Logs on the Cornell Sailing website, particularly the Electric Shock article posted on December 2, 2020, are essential reading for any sailor interested in sailing an electric boat. “Sailing around the world on an electric boat with zero emissions along the route of the first circumnavigation was such a tempting opportunity to do something meaningful and in tune with our concern for protecting the environment that my family agreed I should do it,” Cornell wrote. “What this passage has shown was that in spite of all our efforts to save energy, we were unable to regenerate sufficient electricity to cover consumption and top up the batteries.”

Cornell’s experience in that article is raw, and his tone in that moment bitterly disappointed. We recommend it as essential reading—not as a final rejection of the electric-boat concept or of Oceanvolt’s system, or even as an endorsement of Cornell’s own decision that the system didn’t work. I suspect that I may have arrived at the same conclusion. Yet given the same boat in the same conditions, one imagines that a new breed of sailor—a Graham Balch or a Derek Rupe—may have responded differently to the constraints imposed by an all-electric boat, as nearly every cruising sailor today habitually responds to the inconvenient constraints of diesel engines and lead-acid batteries.

“If you bring electric winches, electric heads and an induction stove, and then sail into a high-pressure system, you’ll set yourself up for failure,” Balch said. “You have to balance your power inputs and your power outputs.

“Sailing an electric boat is a return to the tradition of sailing that the crutch of a diesel engine has gotten us away from,” he added. “Magellan’s fleet got all the way around the world, and they didn’t have a diesel engine.”

Tim Murphy is a Cruising World editor-at-large and ­longtime Boat of the Year judge.

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The 18’ 2025 Volt Electric boat is a cutting-edge watercraft that combines innovative technology with sustainable energy solutions. With a focus on electric propulsion, the Volt 180 offers a clean and efficient alternative to traditional gasoline-powered boats. This model is designed to provide a smooth and quiet ride while minimizing environmental impact. Enjoy a comfortable, slow cruise under the optional sunshade.

Equipped with advanced features and a sleek design, the 18' 2025 Volt Electric boat represents a step forward in the evolution of eco-friendly marine transportation. Join Yacht Hampton in its efforts towards sustainability as Yacht Hampton is quickly becoming the national leader in electric boats.

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Yacht Hampton charters and boat rentals operate 7 days a week seasonally, starting May 1st and until October 15th.

Charters operate during the below timeframe. Flexible scheduling for 2-hour trips.

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We also obviously care about your safety, so we will not set sail in unsafe weather and during any small craft advisory. We will generally make those decisions 2-hours before sailing time. If our captain decides not to set sail that day, due to rain or if a small craft advisory is in effect, you will have the option to receive a rain date for a period of 28 months. This allows you 3 seasons to reschedule. We will apply your payment and you will receive that credit to sail again within the next 28 months.

Once a client books a boat we notify all subsequent inquiries that “the boat is unavailable and taken”, so for this reason we do not offer any refund on cancellations. If you cancel a reservation greater than 30 days away we do allow a no-cost change of date. Inclement weather as stated above is the sole reason for a cancellation.   Please click the "Booking Calendar" link above, check the calendar and book away!

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At VALENCIA Marine Services SLU, we specialize in marine electric conversions, using the latest technologies and techniques to transform traditional boats into fully electric vessels.

Our team of experienced technicians will work with you to design and install a custom electric propulsion system that meets your specific needs and budget.

Our electric conversion services include everything from selecting the right battery system and motor to installing solar panels for charging and integrating the latest control systems for optimal performance.

We also offer a range of other electrical services, including:

• lighting systems,
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• entertainment systems.

In addition to the environmental benefits of electric boating, there are also significant economic advantages. Electric propulsion systems are highly efficient and require less maintenance than traditional gasoline engines, saving you money on fuel costs and repairs over time.

At VALENCIA  Marine Services SLU, we are committed to providing the highest standards of quality and safety in all of our work. We use only the highest quality components and materials, and our installations are rigorously tested to ensure optimal performance and reliability.

If you are interested in converting your watercraft to full electric, contact us today to schedule a consultation. Our team of experts will work with you to develop a customized plan for your electric conversion project, and help you enjoy a cleaner, quieter, and more efficient boating experience.

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• Electric Boat Conversion: Converting a traditional gasoline-powered watercraft to an electric watercraft involves several steps, including selecting an appropriate electric motor, batteries, and control systems. The conversion process also includes removing the internal combustion engine, fuel tanks, and exhaust system, and installing the new electric components.
• Marina Charger Installation: To charge an electric boat, you'll need a charger installed at your marina. There are many factors to consider when selecting a charger, such as the type of battery, charging speed, and power requirements. Our  professional electricians or marine technicians can help you select and install the appropriate charger for your electric boat.
• Technical Support: There are many resources available to provide support for electric boat conversions and marina charger installations. Our companies are specialized in watercraft  conversions and offer installation services, maintenance support, administrative and technical assistance.

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The first step in converting a boat or yacht to electric power is to install an electric motor. There are many types of electric motors available, including DC and AC motors, and choosing the right one will depend on the size and type of boat.

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In order to power the electric motor, a battery bank will need to be installed. The size of the battery bank will depend on the range and speed desired, as well as the size of the boat.

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A charging system will need to be installed in order to keep the battery bank charged. This can include solar panels, shore power, or a generator.

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Onboard electricity basics & faq.

Want to keep your mobile devices charged or use a small appliance away from shore? If your bareboat charter plans include being away from the dock for more than a few hours, beforehand, it's a good idea to understand your boat's electrical system and how to properly utiitize it. 

MSC boats are equipped with two types of electrical power systems onboard.

1) The 12 volt DC system is electrical current supplied directly from the house batteries (direct current = DC).

• Critical onboard systems such as navigation lights, cabin lights, and bilge pumps are wired to the 12 volt DC system.
• You can access 12v DC power through the round “cigarette lighter” outlets, which are often located near the chart table.
• 12v USB charging ports can also be found on some MSC boats, typically in the Gold, Platinum, and Catamaran Fleets.

12v Outlet on SV Attitude Adjustment.jpg

12v USB outlet.jpg

2) The 110 or 120 volt AC system is alternating current that comes from a connection to shore power or from an onboard power inverter.

• Inverters draw 12v DC electricity from the house batteries and convert it to alternating current. This enables the electrical system to power small electronics and appliances such as laptops and coffee makers.
• Connect to the 110 or 120v AC system via the standard house electrical outlets.
• Not all MSC boats come equipped with an inverter. Depending on the inverter, there are limits on how many watts of power an inverter can supply.

Standard 110v Outlet on SV.jpg

110 and 12v Outlets on SV Attitude Adjustment.jpg

Below, we've compiled a list of common questions we've encountered from bareboat newcomers.

How do I use the inverter on my boat?

• Disconnect from shore power, if connected.
• Locate the AC system selector switch, if your boat has one, and ensure it's switched on.
• Locate the inverter's power switch to turn it on. In some cases, the power switch will be on the main electrical control panel. Some inverters have their own power switch built into them.
• If in doubt as to the location of switches, check the boat's white binder or ask an MSC fleet technician for assistance.
• Be sure to power off the inverter when the house outlets are not in use. The inverter will draw power from the batteries even when there is nothing plugged into the outlets.
• Use caution when operating small appliances to avoid draining the batteries or overloading the inverter. Any device that draws more than 800 watts is likely to overload and possibly damage the system. High wattage appliances such as hair dryers and microwaves cannot be used away from shore power.

Inverter Switch.jpg

Inverter on SV Ry Whitt.jpg

How can I prevent battery drainage or damage?

To learn more about smart onboard power management and preventing battery drainage, see our article Marine Battery and Power Management Basics .

Which MSC boats have inverters?

Some boats in the MSC fleet do not have inverters and supply only 12v DC power when disconnected from shore power. If access to 110/120v AC electricity during your time away from shore matters to you, see the article Choosing the Right Boat for Your Charter and check the fleet spreadsheet to see how boats are equipped. 

MSC has one portable inverter that charterers can borrow for boats that do not come equipped with an inverter. Please call or email the office if you'd like to reserve it for your charter (no additional cost).

How can I access 12v power to charge a mobile device?

If your chosen boat does not have an inverter nor 12v USB ports, you can keep your mobile devices charged by bringing your own 12v USB device charger, such as the one pictured here.

12v USB charger.jpeg

Can I run the refrigerator away from shore power?

Please do not run refrigeration when the boat is disconnected from shore power. If you're wondering about refrigerators and the power they draw, see the article Charter Boat Icebox and Refrigerator Basics and Best Practices . 

Do you have a question about using electricity onboard? Please email our friendly office team and we'll add your question to this article.

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I took ASA 101 with them recently. They have the best customer service I've ever seen! I mistyped my address when I signed up online so didn't receive the textbook. I called and the lady immediately sent me another copy! Everyone at the club is super friendly.

I would like to compliment Stan Lander for his coaching, counseling and teaching Heavy Weather Offshore Sailing. Stan was very accommodating to all of the student's interests and shared his many years of insight on handling the boat in heavy seas. I would certainly recommend Stan and this course to sheltered waters sailors. My confidence in handling a boat of this size was certainly enhanced by the experience.

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Field test: PV Modules

A real world comparison between Mono, Poly, PERC and Dual PV Modules.

* This is a field test and the results are specific for this installation on this location please research which is the best solution for your own situation as the results can be different based on environmental influences.

Total solar yield as of 27/03/2023 when the results were reset: Mono: 9158 kWh Split-cell: 9511 kWh Poly: 9113 kWh Perc: 9471 kWh Perc-east: 1970 kWh Perc-west: 1730 kWh

Enjoy the sound of silence

Harnessing the power of the wind makes sailing an unforgettable experience. All you want to hear is the sound of the wind blowing and the waves breaking. But what is the best way to power the on-board electronics while the engine and generator are switched off? Victron combines energy storage and solar generation to provide the power you need. In absolute silence.

Whether you’re sailing away for the weekend or planning a trip around the world, big chance the very same Victron solution could support both. It’s the level of comfort that really determines your optimal solution aboard. With Victron you can power just about any plans, but as an example we illustrated ‘normal’ and ‘heavier’ power profiles in the below for the ‘average’ sailing yacht.

Consumption

• Power Profile
• Complete system

How much do you need?

A modern sailing yacht is packed with a lot of electrical equipment. Most things used to run the boat usually use DC, bigger (household) appliances need AC. When it comes to estimating power consumption, many just add up the Watts. Time is equally important. A microwave might use 1000 Watts, but only for 2 minutes. A fridge might consume as little as 50 Watts, but is turned on 24 hours a day.

For inspirational purposes we’ve outlined 2 system examples based on ‘normal’ and ‘heavier’ use.

1.2 - 2.4 kWh / day

'normal' and 'heavier' energy consumption. Read more

The microwave uses 1000W an hour but is only on for 2 minutes a day. 1000W / 60 x 2 = 0.03 kWh / 2 minutes

The fridge uses 50W an hour but is on the entire day (actually cooling ½ the day). 50W x 24hrs/2 = 0.6 kWh / day

Storage & conversion

How much energy should be stored.

Storing energy allows you to live of shorepower at sea or lets you use solar power harvested during the day over night. The inverter will convert the stored power to 230V. Sailing yachts typically experience long intervals between battery recharges, so your house battery should have a generous capacity. As a rule of thumb, we’re calculating with 48 hrs on board without shore power shore/engine/generator/solar power. Multiply the daily power consumption x days for even greater independency.

The storage capacity of a lithium battery should be two times the daily power consumption.

Due to its ±50% smaller discharge capacity, the storage capacity of a lead-acid battery should be four times the daily power consumption.

The inverter should be sized to handle the average load continuously and should match the expected peak power current, which our inverters handle very well (on average 2 x their continuous current).

Where does the power come from?

Sources of power, power profile.

Normal and heavier power profiles in kWh, based on the daily energy consumption, which should be in balance with the generation.

Storage batteries in Ah, double the capacity using lead-acid batteries.

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System diagram

For a lithium and lead-acid battery based system.

How do the system design considerations translate into a robust system?

GX 4G modules

The professionals choice:

You’ll want to bring small devices on board for your trip. Or use household appliances like a microwave. These usually run of an AC outlet. Think of:

• Phone charger
• Refrigerator

Being able to plug-in these device saves you the trouble of finding a DC version.

Boat engines

Sailing yachts have one or two diesel engines (Catamarans) to get from harbour to horizon. The engines come with alternators to charge the engine batteries, drive fuel pumps, etc.

Once the starter batteries are recharged, the engines can also power the boat electrics and recharge the house battery. On bigger yachts you’ll find power hungry DC equipment such as anchor windlasses and bow thrusters. The engines have to be running before you can use them.

BatteryProtect

Discharging your battery too far will damage it. Adding a Victron BatteryProtect will disconnect the boat’s electronics when the battery voltage drops below a pre-set level. It will also automatically reconnect everything when the battery is sufficiently recharged.

There is more to a Victron BatteryProtect. The built-in shutdown delay ensures that vital electronics aren’t disconnected in error, i.e. when starting the engine causes a short drop in battery voltage.

Battery Management Systems

Battery management systems take excellent care of Lithium batteries, protecting the individual cells of LiFePO4 batteries against over voltage, under voltage and over temperature and will shut down or reduce charging (VE.Bus products only) or disconnect the loads when this occurs.

Victron Energy offers several BMS options, in general the VE.Bus BMS and smallBMS signal separate devices to disconnect the charging (Inverter/Chargers, Cyrix-Li, DC-DC chargers) or disconnect the loads (BatteryProtect, Inverter/Charger), the modular Lynx distribution system features the Lynx BMS and other modules for more control over the DC busbar. For vehicles and boats all-in-one functionalities are available in the Smart BMS versions for Victron Lithium batteries, but also include current limiting to protect the alternator from overheating and BatteryProtect-like functionality to shut down the loads when pre-set critical battery conditions are met.

Victron Energy also offers full flexibility when it comes to selecting a third-party off-grid battery bank (and their BMS) of choice. A large number of well supported Lithium battery manufacturers can be easily integrated through the use of a mandatory GX-device. This flexibility enables our customers to perfectly match their off-grid needs for their unique power situation. When working with unsupported brands, a Victron Energy Battery Monitor is required to pass on accurate state of charge readings to the wider system.

Battery Monitors

BatteryCombiner

The Cyrix BatteryCombiner is the only safe way to connect the house battery to the starter battery (to start your boat’s engines). With a BatteryCombiner you can charge the house battery from the alternator without running the risk of draining the starter battery (which always should be ready to go). When other sources of power are available (eg. shore/solar/generator power), the Cyrix BatteryCombiner will allow bi-directional charging from the house battery to the starter battery.

When the Voltages of the starter and house batteries are the same, use a Cyrix: its current rating should be equal or bigger than the current rating of the alternator. If the house battery is Lithium and the alternators Amperage is smaller than the house battery, or when the Voltages of the starter and house battery are different: use a Orion or Buck-Boost.

Boat Network

Keeping grips on all the systems on board can be a hassle. The solution: tie everything together in a single boat network using NMEA communication standards. Your boat network can include navigation equipment, tank senders, battery monitoring and much more. The status information can trigger alarms and shutdowns, adding to the safety on board. The Cerbo GX now supports the NMEA2000 out protocol, allowing you to monitor your boat’s network of systems from wherever you are.

The BMS 12/200 is a dedicated battery management system (BMS) that protects Victron Smart 12,8V LFP batteries against deep discharges, overcharging and high temperatures with up to 200 Amps maximum DC current. When critical values are exceeded, the BMS acts immediately: loads are disconnected physically in case of a deep discharge and charging is stopped when there is a risk of overcharging. High temperatures trigger an immediate end to both charging and discharging.

This is the only BMS that can be directly connected to an alternator, protecting them from overload/overheating. This works with a combination of an AB fuse (rated in accordance with the expected max load current of the alternator) and an internal programmable input (which limits the input current electronically to 80% of the AB fuse).

Please check your manufacturer for the maximum charging current of your alternator and size AB fuses of the BMS 12/200 accordingly, see manual.

When different Lithium batteries & higher voltages are used, other solutions are needed, such as the VE.bus BMS and Lynx Ion BMS.

Boat Electronics

A sailing yacht is home to several electronic devices. These are all connected to the house battery. Think of:

• Boat control panel
• Log/depth sounder
• Chart-plotter or GPS
• Navigation lights
• Bow thruster
• Interior lighting
• Music player

The Victron Cerbo GX is the communication-centre of your boat’s installation, allowing you to always have perfect control from wherever you are and maximises its performance. Simply connect through our Victron Remote Management (VRM) portal, or access directly, using the optional GX Touch 50 screen, a Multi Functional Display or our VictronConnect app thanks to its added Bluetooth capability.

The Victron Cerbo GX is an easy to use visual system. Instantly monitor the battery state of charge, power consumption, power harvest from PV, generator, and mains, or check tank levels and temperature measurements. Easily control the shore power input current limit, (auto)start/stop generator(s) or even set quiet periods to avoid starting the generator in the middle of the night. Change any setting to optimise the system, follow up on alerts, perform diagnostic checks and resolve challenges remotely. The Cerbo GX turns any power challenge into an effortless experience.

DC-DC chargers

DC-DC converters, or battery-to-battery chargers (converters with built-in charge algorithms) are used in dual battery systems, where the (smart) alternator and the start battery are combined with the service battery (of equal or different voltages) to charge it. They can also be used to charge applications that have dedicated batteries (eg. bow thrusters), or to power applications that have a voltage different than the service battery bank.

Most DC-DC chargers can be used in 12V or 24V systems and all are suitable for both lead acid and lithium batteries. Some DC-DC charger models can be parallel connected to increase the output current. DC-DC chargers are a perfect and safe solution to charge Lithium battery banks from smart alternators (and lead-acid batteries for that matter).

Charging lithium batteries from the alternator Most alternators cannot be directly connected to lithium batteries. A lithium battery will draw more current than the alternator can supply, which may result in permanent alternator damage. To not damage the alternator, current limiting is one of the options to stay within the safe zone of the alternator.

Victron offers multiple solutions to solve this problem, of which one of them are the DC-DC converters:

• DC-DC converters act as a current limiter between the alternator and the battery: the battery can be safely charged without blowing up the alternator.
• Victron also offers alternative solutions for dual battery systems powered by alternators. Some (smart) BMS products physically limit the current drawn from the alternator, in other systems, battery combiners might be a solid option. See the datasheets for more info.

GX GSM Dongle

The Victron GX GSM is a 3G cellular modem that enables GX devices with mobile internet for the system and connection to the VRM Portal, allowing you to monitor your system from remote. When the boat is in range of a 3G network, it will send data to the VRM website and you can monitor the boat from your smartphone. The GSM module adds tracking the boat, recording your trips and putting up a geo-fence around the boat. You will get an alert via mail when the boat travels outside the geo-fence area.

The Victron Energy Cerbo GX is the communication-centre of your systems installation, allowing you to always have perfect control from wherever you are and maximises its performance. The optional GX Touch 50 is a companion to the Cerbo GX, it’s five inch touch screen display gives an instant overview of your system and allows you to adjust settings in the blink of an eye.

Instantly monitor the battery state of charge, power consumption, power harvest from PV, generator, and mains, or check tank levels and temperature measurements. Easily control the shore power input current limit, (auto)start/stop generator(s) or even set quiet periods to avoid starting the generator in the middle of the night. Change any setting to optimise the system, follow up on alerts, perform diagnostic checks and resolve challenges remotely with the free Victron Remote Management (VRM) portal.

Galvanic Isolator

A galvanic isolator prevents electrolytic corrosion. The isolator is mounted directly behind the shore power connector on board. It blocks DC currents that might leak through the shore power earth terminal. These currents can cause corrosion to all metal parts under water, like the hull, propeller, shaft, etc. The galvanic isolator should have the same power rating as the incoming shore power.

It’s a misunderstanding that galvanic corrosion occurs only in metal and aluminium hulls. In fact it can occur on any boat as soon as a metallic part (the shaft and propeller) is in contact with water. Galvanic corrosion will quickly dissolve your sacrificial anodes, and attack the shaft, propeller and other metal parts in contact with water as soon as the boat is connected to the shore-side supply. It might therefore be tempting not to connect the ground conductor: this is however extremely dangerous because Ground Fault Current Interrupters will not work nor will a fuse blow in case of a short circuit to a metal part on the boat.

The safe option is to use a Galvanic Isolator for non-metal smaller boats, or use an isolation transformer for metal boats or boats with bigger systems.

House battery

The house battery stores power for the boat’s electrical system. Sailing yachts typically have long intervals between battery recharges and the house battery should have a generous capacity.

For a house battery you can choose from two types: lead-acid and lithium. There are various reasons to favour one over the other. Here are a few common ones:

Inverter/Charger

The inverter/charger is the heart of the system. In the marina, it charges the batteries from shore power. While sailing it inverts the energy from the boat’s battery into AC power for household devices. The switch from charging to inverting and from inverting to charging is seamless.

• Victron inverter/chargers come with a handful of outstanding features:
• PowerControl: automatically manage battery charging to prevent an overload of the generator or shore power.
• PowerAssist: uses the battery as a buffer to assist the shore power during peak power demand.
• Perfect power: even sensitive devices run flawlessly on the pure sine wave power.
• High peak-power: use motorised equipment without overheating.
• Low self consumption.

For this power profile we would recommend:

We would recommend our Multiplus-II inverter/charger. If you have a generator on board you’ll need a Quattro inverter/charger, which has an extra input (shore power and generator).

We strongly recommend 24 Volts for new boats. The higher voltage is simply a better choice when it comes to meeting the power demands of a modern sailing yacht. If your boat’s system is based on 12 Volts, select a 12 Volts unit instead.

MFD GX Integration

The Victron integration between our GX range and several leading Multi Functional Display manufacturer brands enables you to easily connect an MDF to the heart of your power system such as the Cerbo GX, or the GX enabled Multiplus-II GX. Once connected you can easily monitor and control your boat’s power system, right on your Glass Bridge.

Shore Power

In the marina, the boat will be connected to shore power. Shore power recharges the batteries. It can also be used for maintenance and to run large AC loads.

Often shore power is limited in how much power you can draw, i.e. just 10 Amps. Berths with higher ratings might not always be available. Victron inverter/chargers allow you set a maximum shore power current. Now you can charge your batteries and turn on any equipment without blowing a fuse.

Sometimes shore power is less than perfect. You might run into voltage drops if you’re at the far end of the harbour. There could also be power surges, which could harm sensitive equipment on board. Victron’s inverter/chargers smooth out these problems and turn bad power into perfect power.

Solar charger

A solar charger- also called MPPT controller, harvests the power from the solar panels to charge the house battery. Solar chargers have the same charging cycles as our regular, fully automatic, battery chargers. When your boat is moored without shore spower, solar power is a great way to keep the batteries charged.

In a marine environment, the performance of solar panels changes constantly. Victron’s solar controllers use ultra fast maximum power point tracking to squeeze up to 30% more power out of your panels.

The rating of the solar charger is defined by the size of the solar panel. For solar panels of less than 150W or less, choose a 75/10 charger. If your solar panel produces between 150 and 220W, pick a 75/15 instead.

Solar panel

More and more sailing yachts area equipped with solar panels. After all, they extend the autonomy range without the noise of a diesel engine and… for free. Victron offers a wide range of small, highly efficient, solar panels that are just perfect for boats.

Starter Battery

The starter battery is needed to start your boat’s engine. These batteries are different from house batteries and engineered to deal with a large discharge current. The starter battery should always be ready to go. It’s best to isolate the important starter battery from all other electrical circuits on board, so it cannot be accidentally drained of power.

VE.Direct Bluetooth Smart dongle

The Bluetooth dongle enables you to use the VictronConnect app with VE.Direct enabled devices (without Bluetooth built-in). With the app you can have real-time insight and full control, and you can access all VE.Direct enabled devices such as the smaller VE.Direct inverters, the BMV 70x series battery monitors or MPPT solar controllers.

VictronConnect

All Victron products on your boat can be monitored and controlled from the palm of your hand. Just connect the VictronConnect App via Bluetooth and you’ll have direct access to values like battery voltage and current. You can also turn devices on or off, as well as change their settings.

VRM - Victron Remote Management

Monitor and manage.

Monitor and manage your Victron Energy systems from anywhere and catch potential issues early by setting alerts and alarms. With VRM you are always in perfect control from wherever you are.

VRM works with a GX-device such as the Cerbo GX with internet connection, the GlobalLink 520 or GSM LTE 4-g for smaller systems.

Monitor the battery state of charge, power consumption, power harvest from solar, generator and mains in real-time. Optimise the energy harvest and usage with history graphs and detailed analytical reports. Catch potential issues early by setting alerts and follow up on alarms to prevent definitive system failure.

Easily control the shore power input current limit, switch on the inverter, (auto)start/stop generators or even set quiet periods to avoid starting the generator in the middle of the night. With VRM you can change any setting, follow up on alarms, perform diagnostic checks and resolve challenges from wherever you are.

Lynx Smart BMS

The Lynx Smart BMS is a dedicated Battery Management System for Victron Lithium Smart Batteries (for non Victron Lithium batteries, see below). There are multiple BMS-es available for our Smart Lithium series of batteries, and the Lynx Smart is the most feature rich and complete option. Its main features are:

• Built-in 500A contactor, used as a fallback safety mechanism and also suitable as a remote controllable main systems switch.
• Battery monitor, indicating state of charge percentage and more data.
• Pre-alarm signal: provide a warning before the system shuts down due to -for example- a low cell.
• Bluetooth for use with our VictronConnect App, for setup and monitoring.
• Local and remote monitoring using a Victron GX device, for example the Cerbo GX.

Battery Management System

The dedicated battery management system (BMS) protects Victron Lithium Smart batteries against deep discharges, overcharging and high temperatures. When critical values are exceeded, the BMS acts immediately: loads are disconnected physically in case of a deep discharge and charging is stopped when there is a risk of overcharging. High temperatures trigger an immediate end to both charging and discharging.

Battery monitoring

Lynx Distribution system

Non Victron Lithium batteries

Lynx Distributor

The Lynx Distributor is a modular DC busbar, with locations for four DC fuses. It will monitor the status of each fuse, and indicate its condition with a LED on the front. When connected to a Lynx Smart BMS or Lynx Shunt, the status of the fuses will be visible in VictronConnect and VRM (when the Lynx Smart BMS is connected to a GX-device).

Multiple Lynx Distributors can be used to connect all the DC-loads and charge sources on one side of the BMS, on the other side, a Lynx Power In (without fuses) or another Lynx Distributor (with fuses) can be used to connect the battery bank to the modular busbar.

This product is part of the modular Lynx busbar system that also provides the Lynx Smart BMS, a dedicated Battery Management System for Victron Lithium Smart Batteries (for non Victron Lithium batteries, use the Lynx Shunt).

Power consumption will vary from yacht to yacht and from owner to owner, even on sailing yachts. Here are two examples - with a normal and a heavier daily energy consumption - of what an Optimal Energy plan for a sailing yacht could look like. Please note that many more factors come into play when designing and installing your optimal solution: your Victron Professional will gladly help you with that.

To see this detailed table and the entire section properly, consider using a modern browser.

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MultiPlus magic: small generator, big power.

An expert view: lithium or agm aboard, get your wiring right with wiring unlimited, see your system performance right from your glass bridge, see all our marine products and more configurations., real-time insight and complete control with our victronconnect app, find your local dealer.

Our well established global network of local Victron Professionals is dedicated to help find an optimal solution for your challenge.

Count on our worldwide service

At Victron we find it essential that customers are serviced and supported quickly and competently. This is why our global network of Victron Professionals pack the highest level of technical know-how and are committed to deliver repairs as fast as possible.

So you can start or continue your journey, wherever you’re headed.

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Electric catamarans

Electric ribs, electric day cruisers.

• Center Consoles
• Dual Consoles
• Motoryachts
• Sport Cruisers
• Tenders & Ribs
• U.S. Atlantic
• Engine Buyers Guide
• Electronics

Shore Power Solutions

Fluctuating shore power problems? Yacht Boost gives you shore power solutions.

Yacht boost.

How it Works

Safety issue.

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Shaft drive

Oceanvolt shaft drive motors.

Oceanvolt offers a range of Shaft Drive motor systems to provide propulsion and hydro generation for vessels that require mid-ship motor placement.

Oceanvolt Shaft Drive systems offer a silent, vibration-free propulsion solution that is easy to install, requires minimal cabling and is maintenance free.

Shaft drive (AX)

• Synchronous permanent magnet electric motor
• Shaft drive with 2.46:1 reduction
• Lightweight:  weighs as little as 22kg
• The only complete electric inboard propulsion system with EMC certification
• Dual function:  propulsion & hydro generation (while under sail)

system installation layout (example)

• Nominal Power
• Reduction Ratio
• Motor weight

OCEANVOLT AXC – Modular shaft drive motor systems

The new Oceanvolt AXC series provides higher performance, greater durability and more comfort than ever before. The motors have been designed for the benefit of customers operating larger, heavier displacement boats including charter catamarans, non-planing motorboats, heavy duty commercial boats & small passenger ferries.

The Oceanvolt AXC series is a modular system available in four power configurations 10kW, 20kW, 30kW or 40kW; the latter of these provides power to the equivalent of up to 100hp.  The AXC system can also be installed as a twin system in catamarans and motor boats.

The AXC offers many of the same benefits as Oceanvolt’s SD sail drive and AX shaft drive systems - only now with a longer cruising range, higher top speed and even lower levels of vibration and onboard noise levels due to the direct drive. AXC systems also require significantly less space on board compared to a traditional diesel engine. 4rabet is a betting app that is available in India. 4rabet offers a wide range of betting options for Indian users, including online casino, sports betting, and horse racing. 4rabet also offers a welcome bonus for new users. 4rabet is a safe and secure betting app that offers a great experience for Indian bettors. 4rabet is the perfect betting app for those who want to bet on the go, look here . 4rabet is an excellent choice for Indian bettors who are looking for a safe and secure betting app. 4rabet is a great betting app for Indian bettors who want to bet on the go.

The AXC has an integrated motor controller and can be retrofitted on the existing mounting frame of a Yanmar or Volvo shaft drive motor.

Moscow Boat Tour

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Description

See all the gems of historical and cultural center of the capital in short time and without traffic jams or tiresome walking.

Depending on the itinerary and duration of the Moscow River boat trip, the tour can be 3 or 5 hours.

Highlights of the tour

• St Basil’s Cathedral;
• Stalin skyscraper on Kotelnicheskaya (Tinkers) embankment;
• The Kremlin;
• “House on the Embankment” Stalin skyscraper;
• Monument to Peter I;
• The Central House of Artists;
• Christ the Savior Cathedral;
• Gorky Park;
• Moscow State University;
• Russian Academy of Sciences;
• Luzhniki stadium;
• Novodevichy Monastery;
• Kiev railway station;
• Europe Square;
• Moscow City Hall;
• Government House;
• Expocentre Exhibition Complex;
• and other famous sights.

You will learn about the different epochs of the city from the foundation in 1147 till Soviet times of 20 th  century.

Moscow River

Moskva river has the form of a snake and is the main waterway of Moscow, consisting of a cascade of reservoirs. Within the city, Moskva river is 80 km long, 120 m - 200 m wide and up to 14 m deep. The narrowest part of the river is the Kremlin area in the city center, and the most extensive is around the Luzhniki Stadium in the south. 

Bridges in Moscow

Undoubtedly, bridges and embankments are among the most scenic spots and main attractions of Moscow. Plus, they are so romantic.

• Bolshoy Kamenny Bridge –  Great Stone Bridge –  is the main bridge of Moscow . The first stone bridge was constructed here in the 17th century.
• Patriarshy Bridge  is one of the youngest pedestrian bridges, built in 2004. The bridge connects the iconic Christ the Saviour Cathedral with funky Bersenevskaya embankment, extremely popular place among locals for its trendy art galleries, cafes and panoramic views. Patriarshy Bridge used to be a shooting location for ex-Russian President Dmitry Medvedev's New Year speech to the nation.
• Borodinsky Bridge,  erected in honor of the 100th anniversary of the glorious victory in the Battle of Borodino (which every Russian kid knows about), a fierce legendary battle during the Russo-French war of 1812.
• Bagration Bridge  one of the  pedestrian bridges with most picturesque views of the Moskva River with its numerous upper-level observation platforms. The bridge was erected to celebrate the 850th anniversary of Moscow city in 1997.
• Krymsky Bridge  used to be in Top 5 Europe’s longest bridges some 100 years ago. The bridge got its name after the ancient Krymsky ford which Crimean Tartars used to invade Moscow in the 16 th  century.

Embankments of Moscow

Moscow river boats 37 embankments, the most popular being Kremlevskaya, Sofiyskaya, Pushkinskaya, Vorobyovskaya and Kolomenskaya.

You can get the most spectacular views of the Kremlin from  Kremlevskaya and Sofiyskaya embankments.

• Pushkinkaya embankment  is the most romantic in Moscow. It meanders along Gorky Park and Neskuchnyi garden and is rich for all kinds of entertainment as well as cozy nooks, including Olivkovy beach, the famous Zeleny theater as well as a pier for river cruisers.
• Vorobyevskaya embankment  is part of Sparrow Hills nature reserve. This place opens a beautiful panorama of the river and city from the observation deck and is considered to be the place for taking serious decisions in life.
• Embankment in Kolomenskoye  Museum-Reserve has a special charm due to its peculiar geographical relief. The boat trip around Kolomenskoye would be the most peaceful in your life.
• Taras Shevchenko embankment  is popular among photographers for its modern Moscow City skyscrapers. Highly recommended for your night boat trip.
• Embankments of Moscow are the pride of the capital. A distinctive feature of each of the promenades is its architecture and beautiful views. In addition, almost all the embankments of Moscow have a rich history and a lot of notable buildings.

Different epochs

Taking a walk along the Moskva River by boat, you will witness the architecture of Moscow from different eras and styles. Archaeological studies indicate that already in the XI century there stood a fortified settlement on Borovitsky hill, which is now called the Kremlin. Little fortress could not accommodate all the residents of the rapidly growing city, and the Grand Duke ordered the construction of a new Kremlin, larger than the former.

Boat trip around Kolomenskoe Park

Moscow river boat trip starts from the pier Klenovy (Maple) Boulevard and provides reat views of Nicholas Perervinsky monastery.

Nicholas Perervinsky monastery was founded at the time of the Battle of Kulikov (1380). The monastery, got its name from the surrounding area – “Pererva”, which can be translated like “tear off” and because of the location –  here it abruptly changed its course, turning to Kolomna, standing on the opposite bank.

Nowadays Kolomenskoye is State Art, Historical, Architectural and Natural Landscape Museum-Reserve, which doors are open to everyone who wants to get in touch with the ancient history of Russia.

Take a break from the big city hustle in the shady parks and gardens of the Kolomenskoe Museum-Reserve. Don’t miss a wonderful Church of the Ascension and Tsar Alexey’s Palace in Kolomenskoye!

Monasteries and temples

• Novospassky Monastery
• Founded in the 13th century on the site where now is located the Danilovsky monastery. After a few decades, in 1330, Ivan Kalita moved the monastery onto the Borovitskii hill of the Kremlin. However, in the 15th century, Spassky Monastery again moved, this time to a more spacious place on Krasnoholmskaya waterfront.
• Church of St. Nicholas in Zayaitskom
• Erected in the middle of the XVIII century in baroque style. The building survived after the 1812 fire, but the utensils were destoyed. Parishioners collected donations and restored the temple on their own. In Soviet times, it was closed and re-opened only in 1992.
• Cathedral of Christ the Savior
• The church was originally erected in honor of the victory over Napoleon and was being under construction for long 44 years. Notoriously demolished in 1937 to be a giant swimming pool under open sky. The current building was constructed in 1990s. It is the tallest and one of the largest Orthodox churches in the world.
• The temple was built in 1679-82, during the reign of Tsar Fedor Alekseevich, in late Muscovite Baroque style and can be characterized as bonfire temple. Each gable is a symbol of a heavenly fire.
• Novodevichy Convent
• The most famous concent and monastery in Moscow, presumably founded in 1524. Novodevichy’s status has always been high among other monasteries, it was in this monastery where the women of the royal blood, the wives of Tsars and local rulers of Moscow were kept in prison as nuns.
• St. Andrew’s church  (male acts as Compound Patriarch of Moscow)
• St. Andrew’s church stands right on the slopes of the Sparrow Hills, on the way down to the Moskva River, on the territory of the Nature Reserve “Sparrow Hills”. The monastery is small in size but is very cozy. It’s situated in a quiet courtyard surrounded by temples, fruit trees and flowers.

What you get:

• + A friend in Moscow.
• + Private & customized Moscow river cruise.
• + An exciting pastime, not just boring history lessons.
• + An authentic experience of local life.
• + Flexibility: changes can be made at any time to suit individual preferences.
• + Amazing deals for breakfast, lunch, and dinner in the very best cafes & restaurants. Discounts on weekdays (Mon-Fri).
• + A photo session amongst spectacular Moscow scenery that can be treasured for a lifetime.
• + Good value for souvenirs, taxis, and hotels.
• + Expert advice on what to do, where to go, and how to make the most of your time in Moscow.

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