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This New 62-Foot Electric Catamaran Is a Triplex Penthouse for the High Seas

The zero-emission multihull is topped by a sky lounge with a bar and galley., rachel cormack.

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Rachel Cormack's Most Recent Stories

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Silent Yachts is taking its fleet to new heights, literally.

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The catamaran debuting at Cannes sports an open sky lounge with a bar, a galley, a 12-seat dining table, a fly helm, and numerous sofas. On the decks below lie four beautifully appointed staterooms, a generous crew cabin, and a sprawling main salon of 164 square feet.

Outside, the cat has lounges in the aft and bow for alfresco entertaining and a hydraulic stern platform that can accommodate a vessel of up to 13 feet, like, say, the electric Silent Tender 400. Additional toys can be stowed in the bridge deck.

Like the rest of the Silent fleet, the 62-footer can cruise silently and sans emissions. Designed and engineered by the in-house team, the multihull showcases a sleek exterior and a high-performance reverse bow that can cut through the waves. She is also equipped with two 340 kW e-motors, a 150 kW diesel generator, a 286 kWh lithium battery, and 42 powerful solar panels capable of generating up to 17 kWp.

Silent says the self-sufficient cruiser has an unlimited range and is able to cover 100 miles per day using energy from the sun. As a result, the running costs of the cat are significantly lower compared to traditional, diesel-powered motor yachts. She can cruise at between six and eight knots or soar to a top speed of between 18 and 19 knots

If you’d like to see the cat in action, Cannes Yachting Festival is taking place from September 12 to 17.

Rachel Cormack is a digital editor at Robb Report. She cut her teeth writing for HuffPost, Concrete Playground, and several other online publications in Australia, before moving to New York at the…

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• Cannes Yachting Festival
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Silent Yachts 55: Liveaboard test of this future-proof electric catamaran

• Photos: Jack Haines / Silent Yachts

With there being no engine noise the skipper could make an early start without disturbing charter guests

The crew meet up with another Silent 55 on charter in Mallorca

• Silent Yachts CEO and Tinker head ashore on the tender

The solar array is most effective with the hardtop retracted so it doesn’t shade the other panels

• The 27ft 7in beam gives the 55 excellent natural stability when at rest or on anchor
• You only need to head into port to replenish food stocks – the rest takes care of itself

Returning to the Silent 55 after an evening walk ashore

Breakfast at anchor is the norm when shore power isn’t an issue

• The heart of the boat is a brilliantly sociable space
• The American-style domestic fridge/freezer in the galley

The internal dinette is the team’s workspace during the summer months

• Familiar controls mean the Silent 55 feels no different to helm than a “normal” boat
• The master suite is a great cabin but it needs blinds or curtains
• The VIP ensuite runs most of the length of the starboard hull and it’s a real gem

This spectacular Mallorcan sunset marks a suitable end to a day of silent cruising

• The energy harnessed from the solar panels is stored in a 210kWh battery bank
• The compact electric motors reside beneath the floor
• The digital management system displays power usage and battery life
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An extended stay on board the revolutionary Silent Yachts 55 allows us to assess whether this really is the future of the motorboat

The April 2019 edition of MBY – our Future of Boating special – included a boat test of the Silent Yachts 55 in, shall we say, less than ideal conditions. Given that the boat is a solar-powered power catamaran the sheeting rain that we endured during our short sea trial somewhat hindered the boat’s ability to show us what it could do.

At the time I lamented the weather and commented that to assess properly whether the Silent 55 is a viable cruising machine we’d need more time on board to test its technology in realistic conditions and, ideally, somewhere sunny. Luckily, Silent Yachts agreed so in July we headed out to Mallorca to live aboard the boat for three days to see if it works.

Our meeting point is Santa Ponsa in Mallorca’s south west, not the most salubrious of locations, but the bay, with shelter from the prevailing winds and excellent holding, is where the Silent Yachts team base themselves for the summer months.

It says much about the liveaboard potential of this boat that Silent Yachts’ CEO Michael Köhler and his wife Heike run the business from the Silent 55 during the season and are regularly joined by members of their team and potential clients so that they can experience the boat for themselves.

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A sailor at heart, Michael is not a man who likes to be tied to marinas (they spent one night in port last season) so this tranquil anchorage is ideal. We are met on the quayside by the tender (powered by a Torqeedo electric outboard , naturally) and whisked silently towards the transom of the awaiting Silent 55 where we are welcomed by the Köhler’s Australian sheepdog, Tinker, and meet the other crew members Euan and Christian, who both work for the shipyard.

Every berth on board is occupied, meaning the boat’s living spaces and the technology used to keep the creature comforts running smoothly are going to be thoroughly tested.

Article continues below…

VIDEO: Silent Yachts 55 review

The Silent Yachts 55, with its battery bank and solar panels, is a glimpse into the future of motorboats, but

Welcome to the future: 5 futuristic yachts being built today

Our hosts graciously offer me and my wife our pick of the cabins but they usher us towards the master suite and after some token protestations, we cave and head forward to stow our bags. The master on this four-cabin version (there are five- or six-cabin options available) is a beauty that straddles the hulls and has a vast ensuite that occupies the forward portion of the starboard hull.

The bed is huge, there’s more storage space than you can shake a stick at and the separate toilet, shower cubicle and open-plan basin are particularly luxurious touches. The lack of curtains or blinds over any of the numerous windows catches my eye, however, as this odd omission was also noted on the boat I originally tested back in April.

The boat we’re on is the E-Power version; there is a Cruiser with smaller electric motors and a Hybrid , which mates two 14kW electric motors to a pair of 220hp diesel engines. Our boat has two 250kW (the equivalent of 335hp each) electric motors, an array of 30 solar panels on the roof with a maximum output of 10kW and a 210kWh battery bank.

This neatly interlinked system is tasked with propelling the boat up to a top speed of 18 knots and running its domestic supply, which on top of the usual lighting and sockets includes an American-style domestic fridge/freezer, air-conditioning and a water maker. There is some internal combustion going on, though, because there is a 100kW generator on board, employed as a range extender or charging aid if there is nothing but liquid sunshine in the air.

It’s a beautiful late afternoon so we haul the anchor and creep, in total silence, past our neighbouring boats for a shakedown around the headland. Much of the driving experience is the same as a boat with engines: you turn a key to activate the drivetrain and, though there is no gearbox, the throttles still have neutral, forward and reverse settings – more for their familiarity than anything else.

And it is totally silent; the gearbox whine of the boat I tested earlier this year now eradicated, all you can hear is the gentle swish of water folding around the bathing platform.

Though our boat has twin 250kW motors it’s only got 70kW of power per side because it is still in the final stages of manufacturer testing, which is a shame. That said, even with the full 500kW on tap, you’re still going to run the boat most economically at 6 knots.

Even an increase of speed to 10 knots could decrease running time by two hours or more, so it pays to stick in the slow lane – no hardship on a power cat of such dimensions and inherent stability with a litany of places to chill out in as the boat glides towards its destination.

We found ourselves gravitating towards the padded nets on the foredeck where you can sit with the sun on your face and breeze in your hair, gently bobbing up and down with the motion of the swell. The nets, your proximity to the water and the hushed progress engender a unique connection to the sea beneath you that is really rather special.

Though we have over 50% charge in the batteries Michael fires up the generator on the way back to base to top them up a touch; doing this while running is the best time because you barely notice the noise of the generator on the move.

We awake early the next morning as bright sunshine cascades through the windows of our cabin. Every other cabin on board is fitted with blinds, but the splendour of our huge master suite is dampened a touch by the lack of them in here. The windows are at least heavily tinted so we can get changed safe in the knowledge that we can’t be seen by the crew on deck.

These quibbles evaporate as we head to the main deck for breakfast, which is laid out invitingly on the sprawling cockpit table. This is the heart of the boat, an area where the cockpit and galley merge and one where the crew naturally congregates. The weather is beautiful so we plan a longer cruise to an anchorage a few miles east near Puerto Portals.

With the sun beating down already we depart our base with 65% charge in the batteries, pick up the 6-knot cruising speed and settle in for the ride. To get the best out of this boat you have to think like a sailor when passage planning, manipulating the elements as best you can so that they are helping and not hindering progress.

Tidal flow or current and wind direction all have an impact on range so it pays to have nature’s forces on your side. If high-speed blasts between islands is your thing then this boat isn’t going to work for you, but if time is your friend then the Silent 55 makes a lot of sense. Consider this too, if it’s autonomy you’re after then the 55 is in a league of its own. You only need to head in to port to top up with water (if you don’t have the water maker) and replenish food stocks.

With a 600-litre diesel capacity the generator’s tank will not need regular fills and there are no mechanicals to service apart from the generator itself so you need to carry very few spare components. You don’t depend on shore power either so if you genuinely want to live on board and get away from the crowded surroundings of a marina this boat delivers that.

The powercat frame is ideal for this usage too, given the sheer amount of living space. Where you’d normally find a pair of big engines are two enormous storage voids because the compact electric motors live beneath the floor in the aft cabins. Its twin hulls and 27ft 7in (8.46m) beam endow it with inherent stability, too, creating what feels like your own little island and a tremendous base from which to enjoy the piercing blue water of a Mallorcan cove .

She’s electric

Our 10nm mile journey on electric power took around two hours and during that trip the charge diminished from 65% to 48% (giving a theoretical range of 59 miles on a full charge). Once the anchor hits the seabed we use just 2kW of power running the domestic supply, though there is a spike when we turn on the air-conditioning to cool the cabins down before bed.

There is sufficient energy to run the air-con without turning the generator on, but with a stiff breeze blowing through the boat a quick blast is all we need for a comfortable night’s sleep. As the day boats make a dash for home at dusk, the bay becomes our own and after a refreshing dip we shower and change before the teppanyaki grill is set up on the cockpit table and we prepare to enjoy a beautiful dinner as the sun melts into the horizon.

The next day we have to return to Santa Ponsa so it’s up early for a glorious morning dip to shake off the previous evening’s digestif. The pace of life mirrors the pace of boat, but we decide to have breakfast on the move so we can get back to base before it gets too busy.

With there being no engine noise or vibration the skipper could easily make an early start without disturbing charter guests, something you would struggle to achieve on even the most well-insulated diesel boats.

Maybe it was the Mallorcan sun or a case of being caught in the moment but as we cruised silently west and I took to the cosy perch on the Silent 55’s port side deck I couldn’t help thinking what hard work it looked as other boats charged about with their bows in the air and guests glued to their seats. We pull up in Santa Ponsa with a healthy 37% of charge remaining in the batteries.

Our verdict

The Silent 55 is not perfect and you can see and feel the yard’s immaturity in the rudimentary finishing in places. I also have an issue with the terrible view from the lower helm, even though you spend most of your time helming from the flybridge. Nor is the Silent 55 a handsome craft; designs for the 80 and 60ft versions show a far more attractive look with much neater proportions and a tidier window line.

In early September, though, I receive a video from Michael via WhatsApp. It’s of him standing on one of the bathing platforms as the Silent 55 charges through the water at 17 knots on electric power. The testing phase, it seems, is complete and all 500kw can be laid down at once; it’s quite a sight to see the boat travelling at such speed with no engine noise whatsoever. The boat may still need some of its rough edges smoothing off but the technology works and sets an important motorboating milestone.

Price as reviewed:

£1,730,000.00 (ex. VAT)

Price from : €1,400,000 ex VAT LOA : 54ft 8in (16.7m) Beam: 27ft 7in (8.46m) Draught : 2ft 1in (0.64m) Displacement : 19 tonnes (light) Fuel capacity : 600 litres (132 gal) Water capacity : 500 litres (110 gal) RCD category: A for 12 people Design: Michael Köhler & iYacht

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Review: Silent 55, the extraordinary solar powered yacht

• January 18, 2019

Silent Yachts is tapping into the solar zeitgeist and creating a new meaning for the term ‘powercat’.  Sam Fortescue reports

There is a slow, silent revolution under way in the yachting world. It is a revolution that is introducing tonnes of lithium and a sprinkling of silicon to the spec list of new boats. Holding out the promise of silent mobility, plus limitless domestic power on board, it made a big splash at the last Cannes Festival of Yachting – not least thanks to the new Silent 55 catamaran which debuted there.

From the pontoon side, the Silent 55 looks like a typical modern catamaran, with a big coachroof studded with windows and a flybridge helm. Except there’s no mast. Now, bear with me here. I realise that this is a sailing magazine, but we will shortly get back to more familiar territory. The unique qualities of this catamaran only become apparent from up top, where an expanse of solar panels stretches away fore and aft, embedded into the coachroof. The hard top itself carries yet more panels, and can be folded down flush to give an unshaded solar array of 49m2. During the heat of a summer day in the Med, this is capable of generating 10kW of power and up to around 60kWh in the course of the day.

But to make a solar system work in reality, Köhler had to go back to the drawing board on yacht design. The saloon and hulls have extra thermal insulation to keep air-con losses down, and the use of carbon and aramid in key areas helps reduce the overall weight to a decent 17 tonnes (a Lagoon 52 weighs 22.5 tonnes). He has tried to keep windows out of the direct sun with long overhangs and in contrast to the Lagoon’s 12 deck hatches, the Silent 55 has just two.

Holistic design

On the other hand, it has lots of opening windows, to allow a natural draught to do its job. “It’s a holistic approach – you can’t take the batteries and the drivetrain and drop it into another boat.”

Of course, using the propulsion system quickly takes its toll of the boat’s 140kW battery bank. The model on display at Cannes had two 135kW motors, giving you just half an hour of silent motoring flat-out, albeit at a top speed of over 20 knots. More reasonable 30kW engines and a single-digit speed give you greater range. Nonetheless, the electric drive alone isn’t going to allow you to outrun a storm, or race home after a day at anchor, so the boat is designed to work with a generator hidden in the heavily insulated transom of its starboard hull. At cruising speed of around 5-6 knots, Köhler says there is rarely any need to use the generator, citing an owner who has just emailed him triumphantly about a second year totally generator-free. “In the end, you have to compare it to the performance of a sailing boat,” Köhler says. “It is as fast as a sailing boat in similar conditions – after all, there is no wind without sun.” He went so far as to tell me during the sea trial in Palma, Mallorca, that he believed the majority of sailors would happily dispense with the hassle of sails and a rig if only they could enjoy silent motoring and anchoring. “As soon as people realise the incredible concept of this boat, they won’t understand why they ever did anything else.”

The market does not seem to agree with him – yet. Sales of the boat have been good – they have already sold six, five of which are already in the water. But of those, four customers have taken the sail option, which means planting a 19.7m tall mast complete with boom and rigging slap bang in the middle of the coachroof solar array. “I was a bit amazed,” Köhler admits. “The shade from the rig reduces the energy generated by the solar area, while it costs more and is heavier, so consumes more fuel. Maybe it is for optical reasons.” In fact, the shade of the rig slashes the average yield of the solar panels in half. In the Med, that means around 30kWh per day. But perhaps it figures. The typical profile of buyers is an environmentalist who has a Tesla electric car and is “an early adopter who likes to have things before others”. And at low speeds, with modest use of the air-con, the reduced energy generation should still cover daily consumption.

The performance under sail should be reasonable because of the lightweight build of the boat, its broad 8.47m beam and stub keels added to each hull. Control lines are led back via conduits in the coachroof to the flybridge helm station, to make single-handing under sail a possibility.

More interesting, I think, is a sort of halfway-house option using a kite rig. This optimises the performance of the solar panels and gives plenty of propulsion. On the smaller 55 and the 64, Silent Yachts currently recommends a 19m2 kite that costs around €25,000 – a fraction of the cost of a new mast, boom, shrouds and sails. “The sail automatically makes a figure of eight above the boat, and you can steer it with a joystick or an app on an android phone,” Köhler explains. “It can propel the 55 at up to 6 knots, even in light winds.” Perfect for an Atlantic crossing, then.

For the bigger Silent 79, which will hit the water in the summer, a commercial grade Sky Sail system needs to be used – a smaller version of the ones used on cargo ships. This kite can propel the boat at ten knots, but it costs more than ten times as much as its smaller cousin. Both are capable of pulling the boat upwind. So far, so new. But outside the novel energy and propulsion system, the Silent 55 aims to do what many other cruising catamarans are trying to achieve. “Most of our clients order for circumnavigation and long-term cruising,” Köhler says. So the boat is aimed to be as comfortable and capable as possible with watermakers, TVs and an induction hob that all capitalise on the boat’s abundant energy. A flexible configuration allows owners the choice 
of between three and six cabins – the latter designed for charter. The owner’s cabin lies forward of the saloon, under the windows of the coachroof, which provide magnificent views and abundant natural light. There’s a walk-around bed and steps down into the starboard hull give access to an en-suite shower room and heads.

In my view, the best cabin lies aft of this, accessed in the traditional manner down steps out of the saloon. The king-sized bed lies athwartships and the shower is larger than that of the master cabin. There’s more space down here, better headroom and still plenty of light courtesy of the many hull lights.

When I had the chance to sea trial the Silent 55, albeit in motorboat format, I jumped at it. It was a contrary autumn day on Mallorca with 15 knots breeze – just a shame, then, that this wasn’t one of the sailing configured versions.

To start with, getting on board is made really easy courtesy of deep boarding platforms on the skirts. She feels rather square because of that vast, glazed saloon with its deep overhang, and perhaps because of the utilitarian nature of the hard top, which is really about supporting more solar panels. Nevertheless, the side decks are broad and uncluttered. The space up top is designed to concertina down flat, hence the hydraulic rams, fold-down seat back and lowering console. It makes a great sailing position, though, with all round visibility, and is also perfect for sundowners at anchor. When the rain comes down, this feels quite exposed, but there is a fully sheltered helm at the front of the saloon, and it is also possible to drive the boat from anywhere using a tablet thanks to smart electronics. Under power, the handling is superb. The quietness of the motors is astonishing, and I gather they’ll be inaudible on the next boat, which will do away with the gearbox. Even in the aft cabins, directly above the motors, there is no more than a distant hum. The boat responds instantly to the power and the wind seemed to have no impact at all. As with any propulsion system, the power consumption jumps as you pile on the speed – it was sobering to see. At 6 knots, both motors drew 10kW but at 8 knots it was closer to 30kW. I liked the huge saloon with its raised table for 360º views. And the sliding door and window gives great access aft, connecting the saloon and cockpit in fine conditions. The finish was smart and in muted tones, feeling more Scandinavian than German.

Intriguingly, at least it seems to me, Köhler has tapped into something with the concept behind Silent Yachts – but not entirely for the reasons that he expected. Buyers are opting for the sail or kite versions of the boat because they want a comfortable wind-powered craft with abundant, quiet energy on tap. It brings a whole new meaning to the 
term ‘powercat’

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How SILENT-YACHTS has quietly helped fuel a sustainable revolution

“I see what we are doing at SILENT-YACHTS as being like what Tesla did in the automotive industry,” says chief marketing Franz Böse. “They started developing an electric car when no one else in the world thought it was a good idea. And just look now. Our founders did something very similar.”

SILENT-YACHTS is a disruptor in the superyacht industry, firmly set on a mission to spark a green revolution with its fully electric yachts. While other yards have been slowly – and, some might say, belatedly – investigating the possibilities of introducing alternative drive-train solutions, SILENT-YACHTS ripped up the blueprints for what a yacht could be.

Like at Tesla, the SILENT-YACHTS team didn’t want to compromise in chasing their objective. They wanted to combine the noiseless cruising and unlimited range of a sailboat with the comfort of a motor yacht. To have true ocean-crossing capabilities and virtually no need for maintenance. To allow luxury self-sufficient yachting to truly go hand in hand with nature.

And the result is a line of seven solar catamarans ranging from the SILENT 60 at 18 metres to the SILENT 120 Explorer at 36.7 metres. On each one, solar power is used for propulsion, powering all navigation, household and comfort appliances (including AC) and for charging toys and tenders. When the sun isn’t shining, power comes from state-of-the-art lithium batteries charged by photovoltaic modules on the top and middle deck roofs. There is no diesel motor lying ready “just in case” (although there is a diesel regenerator to top up the batteries if needed).

“The boats run very efficiently because right from the start we intended them to be solar electric boats,” says Böse. “You can live 100% from the solar energy. It’s quieter, more stable and you can do everything you want. You are also more independent – you have watermarkers, you can be out at sea for a very extended period of time. Our catamarans offer an environmentally friendly approach plus the opportunity for maximum freedom.”

SILENT-YACHTS has seen a change in owners becoming increasingly eco-conscious. “Most of our customers drive electric cars, they have solar panels on their houses or their company buildings, they are tech people that have a different mindset,” Böse says. “They are striving for a better future and are interested in something different. I am sure there will be customers who might get pressure from their children, who say ‘Dad, you can’t have a yacht that burns that much fuel’.

“Most of our clients understand this is the right approach to yachting and how the future will be like.” And younger owners themselves are interested because they “don’t see motor yachts as an option for them because they know how much diesel and fuel big boats can consume”, he adds.

As awareness of climate change continues to grow, the yard believes the tide is turning in the industry. “The market is growing, interest in and enquiries about our boats is increasing,” says Böse. “We have customers that used to own a big sailing yacht or motor yacht but now they want a more relaxed and environmentally focused approach to yachting. Our niche will further grow; every year the slice of the cake will get bigger. Regular diesel catamarans will become outdated and unpopular. I am convinced they will die because eclectic cats have so many advantages.” He predicts a switch to electric boats in the smaller size ranges, too, once there’s an improvement in the charging systems

SILENT-YACHTS has sold more than 50 solar catamarans so far, with about 25 boats in build. By 2025, it expects to be producing 25 a year. Of its models, the 60 is the most efficient because it’s the smallest. With any new technology, there are bound to be some humps in the road. Böse admits that in port or on anchor, the 120 can run 100% on silent electric for a long time but might have more need of the diesel generator to add to the propulsion from time to time. 

SILENT-YACHTS’ green revolution is already starting to positively affect the wider industry, Böse believes. “We are convinced that what we did a decade ago, when SILENT-YACHTS was founded, ensured the industry started to change. Now we are seeing new companies opening with similar boats and big shipyards beginning to invest in alternative drive-train solution. And we welcome that transition. It was always one of our main motivations.”

The yard has plans to expand its offering, but for now it is – true to the brand name – keeping quiet. As Böse adds: “We will for sure enlarge our range – in which direction and with which boats we will keep a secret for now.”

To discover more about the SILENT-YACHTS, visit the company’s website. 

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Silent Yachts introduces Silent 80 Tri-Deck - the most spacious solar electric catamaran ever

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120 Explorer

The boldest expression of solar powered yachting yet.

Our 120 Explorer brings Silent technology to the superyacht level. Capable to taking you almost anywhere on the water, she pushes our dedication to engineering and innovation further than any other electric yacht before. Just as with our 80 Series, Marco Casali was responsible for the futuristic exterior and opulent interior design of this supercatamaran. Bespoke customization across all four decks ensures the owner´s vision will be transformed into reality effortlessly.

Specifications

Exterior deck

Flybridge & Helipad

Solar-electric yachting advantages

Unlimited range, noiseless cruising, zero emission, minimal maintenance, 12o series highlights.

Touch & go helipad

With the help of a sliding mechanism, the solar panels are capable of moving apart – revealing a sun deck which can also be used as a touch and go helipad. It was specially designed for eVTOLs (electric Vertical Take-Off and Landing aircrafts). This makes her the first Silent offering 4 complete decks.

Electric submarine

In combination with the NEMO, a series produced electric submarine, you can explore depths of up to 100 m. Designed by U-Boat Worx, the batteries of the optional submarine can be recharged by connecting it directly to the yacht.

2 Tender garages

The 120 Explorer is equipped with two tender garages. The first one is located between the hulls and accommodates limo tenders of up to 7.5 m. In addition, a smaller crew tender and toys can be stored in the side-loading garage in the port hull.

Incredible space

900 m² of combined exterior and interior space means this super catamaran offers similar amounts of space as monohulls measuring up to 50 m in length, giving you plenty of opportunity to play with.

8 Years Warranty Battery Banks

4 0 years warranty solar panels, lifetime warranty electric motors, rina class certification, ocean crossing capabilities.

If you would like to enquire about this electric yacht and get in touch with a member of our team, please click on the button below.

Other models

Silent Group

Our charters offer you the opportunity to book a memorable vacation on board of our electric yachts. Including our helpful crew, consisting of a captain and a chef, you will experience the comfort of solar powered yachting.

As the pioneers of solar yachting, we have almost three decades of experience regarding the research, design and build of electric yachts. Our team, shipyard and the hiring of new talent are the backbone of our operations.

By transferring our solar yachting technology, Silent Resorts develops sustainable beachfront resorts in beautiful locations worldwide. Memberships offer full or part ownership of an eco-property and a Silent yacht.

Create your infinite playground on the water. A selection of premium electric water toys, which can be recharged by simply connecting them to your Silent yacht, as well as other accessories for the ultimate experience on board.