silent yachts 44 review

• Yachting World
• Digital Edition

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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Silent Yachts – Noiseless Limitless Cruising Catamarans

Solar power catamarans...ingenious and real.

Imagine leaving no footprint except those in the sand on faraway beaches as you silently cruise. With these solar catamarans, it’s possible! We covered these amazing solar-electric yachts back when they were mere concepts.

The Austrian-based solar catamaran producer drew stronger interest after the Silent 55 earned the Best of Boats Awards 2019 in “Boat for Travel” being “suitable for long distance travels with all amendments to live on board permanently, adapted for both inland waters and the tough conditions at sea.” Amazing results for where electric-solar catamarans were only a year or so before.

Silent Yachts began delivery of the Silent 55 in 2019 and in 2020, during a global pandemic, sold six Silent 80 catamarans (starting from $4.6 million). Construction in Ancona, Italy, was slightly delayed due to COVID19 closure of 2 of the 4 factories, but the shipbuilder continues with delivery of these amazing catamarans as well as their evolution. At the end of 2020, Silent Yachts had a dozen luxury electric catamarans in production from 55′ to 80′ at a starting price of $1.8 million.

After these successes, designer Marco Casali of Too-Design continued innovating crafting a Loft version of the Silent 80 to excite solar catamaran enthusiasts.

Founder and CEO, Michael Köhler, birthed the concept. Interior and exterior designs are by Marco Casali of Too-Design with Amedeo Migali of MICAD in charge of naval architecture.

The Silent 80 with its silent electric propulsion, has unlimited range; no noise or fumes. Seventy solar panels, electric motors, and lithium batteries (used by Tesla) have been incorporated into the design to make it most efficient while maintaining the overall balance in shape. If you want to know more in depth on this efficiency, read this excellent article on Silent Yachts’ engine, battery configuration, and power management .

All components are virtually free of maintenance which makes the running-costs much lower than that of a comparable conventionally powered catamaran. The Silent Yacht is powered by electric motors and has a cruising-speed of 6-8 knots, and maximum speed is 10 knots. Without an engine room, the Silent 80 has enough space for a 4.5 meter tender, and gyrocopter!

Success has not stopped this solar catamaran designer from striving for bigger and better ideas. Recently Silent Yachts Silent announced its plan to build catamarans in collaboration with Volkswagen, powered by VW electric drive matrix (MEB). The catamaran ranges will be designed by VW subsidiary, SEAT’s Cupra brand. Auto and marine manufacturers joining forces have shown success before when BMW teamed up with Torqeedo for outboard engines, so it will be interesting to watch.

High Cost of Solar Catamarans Debunked

As with any new paradigm, the skeptics have loud voices during early introduction of new concepts. And solar-electric catamarans are no different. As excited as we are about this, we must confess our healthy skepticism is still alive. But we recently read an interesting article that compares the Silent 80 to the Lagoon Seventy8 . It points out that because operation and maintenance costs are so low that only a few years of ownership negate the higher purchase price of the Silent 80.

It’s actually quite a tempting proposition to enjoy all the comforts and necessities that requires lots of power aboard without the smell, roar, and Earth-damaging emissions of diesel generators. And eliminating the dangers and inconvenient refills of the propane cooker in the galley is another reason to give a second and a third look at these new solar catamarans.

Read on for pictures and more details of these solar-powered cats with lots of options including hybrid diesel operations and and a true “sail” option.

Silent Yachts Solar Catarmarans in All Sizes

Silent-Yachts is producing the following models:

• Silent 55 – Specifications ,  Panoramic Tour
• Silent 60 – Specifications
• Silent 64 – Specifications  (discontinued)
• Silent 80 – Specifications ,   Panoramic Tour
• Silent 80 3-Deck – Specifications

CONTACT US FOR SPECIFICATIONS & PRICING

All models come with the following options:

• Cruiser – 2×30 kW – with top speed of 12-20 Kt
• E-Power – 2×250 kW – stronger dual e-motors than the “Cruiser” and more powerful battery banks for double the power and speed of the “Cruiser version”
• Hybrid Power – 2×220 HP + 2×14 kW – powerful diesel engines together with the electric motors achieve top speeds of 20+ knots
• Sailor – convenience of sails added to the Cruiser in the 55′ range
• Sky Sails – towing kite system with full automatic control for the 64′ and 80′ ranges which eliminates shade on solar panels by sails and frees up valuable deck space. 

Silent 55 Seatrial Reviews, Video, & Pictures

Read these Silent 55 catamaran reviews:

• Yachting World’s Silent 55 Review
• Power and Motor Yachts’ Silent 55 Review

Be sure to visit the links above for more images and info. Here is a video and a few photos of the elegant Silent 55.

Estelle Cockcroft

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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
• Top stories

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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Greener and Better: the Silent 60

• By Chris Caswell
• December 16, 2022

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Built for Safety

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

Kite Sailing

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

Big Sisters

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

Take the next step: silent-yachts.com

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Boat of the Week: This Solar-Powered Electric Catamaran Can Cruise Silently and Emissions Free

Minimal emissions from a solar-powered, 60-foot motoryacht is a very big deal. but we found other big features that could be improved., howard walker, howard walker's most recent stories.

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John, Paul, George and Ringo singing “Here Comes the Sun” would make the perfect anthem for Austrian-owned Silent Group’s newest 60-foot power catamaran, the $3 million Silent 60.

Why? Without sunshine, you won’t get very far.

Thankfully, the searing Florida sun is beating down as we take to Fort Lauderdale’s bustling Intracoastal Waterway to try-out this eco-friendly Silent 60. With its roof and foredeck crammed full of solar panels, the sixty-footer is humming along at a leisurely six mph on just zero-emissions battery power.

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The batteries are recharged by solar panels that occupy nearly every available square foot of exterior space.  Courtesy Silent Yachts

Just as its name suggests, the ride is hushed, with just the gentle, soothing sound of water bubbling-up in the wake to interrupt the peace and quiet.

“Silent running is top of the list when it comes to what appeals to our customers. They don’t want to hear engines or feel vibration,” Silent Yachts ‘ in-house designer Juliana Miguel told Robb Report , during the run.

“These days it’s also about fuel costs,” adds US sales director, Philip Bell. “One customer ordered a new 60 after getting tired of using his 80-foot Italian motoryacht for weekend trips to the Bahamas and spending $12,000 on fuel each time.”

The 30-foot beam delivers strong interior space and wide social areas on the outside.  Courtesy Silent Yachts

The Silent 60’s claim to fame? Quiet, zero-emission, electric-only cruising at 7 to 8 mph for up to nine hours, or roughly 100 nautical miles a day. Throttle back to 4 mph, and the company says you have the possibility of near perpetual motion.

We’re sampling the third hull of the constantly evolving Silent 60 series that launched last summer. Silent has been the leader in inventing the solar-powered electric-cruiser niche. Replacing the original Silent 55, the 60 has been such a boat-show hit that more than 30 are currently awaiting construction at Silent’s yards in Fano, Italy and Istanbul, Turkey.

The yacht we’re on is an original folding-hardtop version, with its cantilevered roof panel that, at the push of a button, lowers to cover the small, open flybridge area. Tastes, however, are evolving.

The boat’s 30-foot beam allows for an apartment-sized, open salon.  Courtesy Quin Bassett

According to Bell, most of the new 60s currently in build are “tri-deck” models, featuring a significantly larger flybridge area, a fixed rather than folding roof (also covered with solar panels), and the option of a fully open flybridge, or glass-enclosed “sky lounge,” designed for additional entertaining space or even a master suite.

At the dock, given its 30-foot beam, the 60 looks humongous. To our eyes, it’s not going to win any beauty contests. Towering, vertical hull-sides, a fairly-shapeless upright bow design, and straight up-and-down cabin sides give the catamaran a square-edged, boxy look. All function with little form.

But what the owner gets are huge interior spaces. Inside, it feels like a floating apartment, with a cavernous salon, spacious galley, large dining area, and huge aft deck. Down below are choices of three or four spacious en-suite cabins in the hulls.

A good boat for the sunny canals of Fort Lauderdale.  Courtesy Quin Bissett/Silent Yachts

But the quality of the interior doesn’t track with the boat’s $3 million-plus price tag. Thin cabinet doors, dull-looking fabrics, gelcoat fiberglass on the salon ceilings, faux-wood vinyl flooring, and an inside helm station that was little more than an upholstered board with instruments that looked haphazardly arranged, were all below par, considering the upscale market Silent is targeting.

Miguel says the interior will change with the next generation of 60s arriving towards the end of the year, with a big step-up in terms of quality of materials, attention to detail, style, and fit and finish. So, why didn’t they wait to unveil the boat to the media before they got to that point?

The man at the helm is Silent Yachts’ delivery captain and chief tester Kyle Miller. With a jiggle of a joystick control and a touch of bow-thruster, he maneuvers the 60 out of its tight, side-on slip and eases into the busy Intracoastal Waterway.

All function, no form? The 60-footer’s boxy shape is out of synch with other cat manufacturers that use more curves in their superstructures.  Courtesy Silent Yachts

The yacht features Silent’s E-Power propulsion package, with twin Dana TM4 200kW or 268 hp electric motors and 207kWh lithium-ion batteries. They’re good for an 8 mph cruise speed and claimed 16 mph top speed. There’s also a base version with twin 50kW or 67 hp motors juiced by a 143kWh lithium-ion battery bank. Even Miller admits this is short on power.

The best, and of course the priciest, option is the E-Power+ package, featuring twin 340kW 455 hp motors and 286kWh batteries. It’s said to be good for tide-punching bursts of up to 20 mph.

“For anyone who wants to dash around at 17 knots all day long, our recommendation is to buy a different boat,” says Miller. “The Silent 60 is designed for relaxing on the move, gliding from one anchorage to the next, and being self-sufficient on the hook.”

Open space on the flybridge.  Courtesy Silent Yachts

As we discovered, the 60 isn’t always a Tesla of the seas. Running over 6 mph will necessitate firing up the Hyundai diesel generator for one of every three hours of running time to keep the batteries charged. And that’s not silent.

While ambling along at 6 mph is fine for laid-back cruising, we also had concerns about a lack of reserve power for tackling strong currents and adverse tides.

Even our test boat’s twin 200kW motors struggled to keep the 60 under control when maneuvering against a fast, incoming tide under Lauderdale’s narrow 17th Street Bridge. The bigger 340kW motors are definitely the way to go for running in fast currents or tidal waters.

Galley and dining area  Courtesy Silent Yachts

Without doubt, this new Silent 60 showcases the appeal of electric power on the water. The way it efficiently and effectively harnesses the sun’s rays, its largely zero-emissions running, coupled with its huge and versatile interior space, is impressive for a family cruiser.

Just don’t plan on getting anywhere in a hurry—and beware of fast-running tides.

Read More On:

• Electric Yacht
• Silent Yachts

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SUNPOWER VIP 44

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

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

Special Features :

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

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

SPECIFICATIONS

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

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Sunpower Sports Sedan 44

Electric boats

Silent yachts, silent yachts launches solar catamaran with kite wing sail and 100 mile daily range from the sun.

Solar boat engineer and designer Silent Yachts has shared new details of the SILENT-60, a 60′ catamaran with 42 solar panels and two electric propelled motors backed by 286 kWh of battery capacity. While Silent Yachts’ solar-powered vessels are all unique, the SILENT-60 will also be fitted with a 9-13 square meter kite wing, generating additional clean power to pull the yacht.

Silent Yachts was founded by Heike and Michael Köhle, who together have sailed over 75,000 nautical miles around the world, and decided there had to be a better way to propel yachts with clean energy.

After beginning research into solar yacht technologies in 2004, Silent Yachts gathered five years of sailing data and constructed its first fully self-sufficient solar-powered catamaran , the Solarwave 46.

After a five-year trial at sea that began in 2010, Silent Yachts had a proven solar yacht concept, and began serial production of luxury sustainable vessels in 2016 with the SILENT-64. By 2018, The SILENT-64 had become the first serial-production solar-powered bluewater catamaran to cross the Atlantic, from Cartagena, Spain to Barbados in 16 days.

In 2020, the company announced a partnership with Volkswagen Group , which will supply all the components and batteries for a new 50-foot yacht. The yacht will be designed with the help of Cupra, and will utilize VW’s MEB Platform.

Earlier this year, Silent Yachts launched the SILENT-60 as a more powerful, revamped generation of the SILENT-64. With the company’s latest announcement, the SILENT-60 catamaran looks to separate itself from other solar yachts by utilizing even more sustainable propulsion techniques.

The SILENT-60 solar yacht specs

In addition to being a yacht completely powered using solar energy, Silent Yachts has now shared an additional kite wing option that can deliver even more clean range to the Silent-60.

According to the press release, the SILENT-60 will be the first vessel to be fitted with a nine or 13 square meter kite wing, although the option will now be available on all Silent Yacht models.

After deploying the compact kite, it drifts away on the surface of the water before pulling taught and launching into the air. When it reaches its optimal flight height, the kite begins to trace a “figure 8” in the sky, generating additional power to pull the solar yacht. Silent Yacht founder Michael Köhler elaborates:

The main advantages of a kite over a conventional sail system are that it does not throw shade on the solar panels, does not need a tall mast, and generates up to 10 times more power per square meter than a traditional sail. In addition to that it saves about 1.5 tons of weight compared to conventional rig and costs much less. It makes even more sense for the SILENT boats that run on renewable solar energy because the power generated by a kite easily exceeds the energy consumption of the system, so you can charge the batteries while cruising under kite power. And besides that, it’s great fun!

When yacht owners want to stop kiting, an automated app controls the kite, moving it to a position right above the boat where it has the least pull on the line. This allows for more easy electric winching down over the foredeck for stowage.

In addition to the wind kite option, the SILENT-60 yacht comes with 42 solar panels, garnering 17 kWp of energy from the sun to power two, 340 kW electric motors. The system is backed by a battery capacity up to 286 kWh.

As a required safety measure, the SILENT-60 is equipped with a generator and 1,000 liters of fuel. However, according to the Silent-Yachts’ owners, they almost never use it because they have enough solar power and electric energy.

According to Silent Yachts, the SILENT-60 can cruise efficiently with zero emissions using solar power only for up to 100 nautical miles a day and can maintain that pace for weeks. The vessel’s cruise speed is six to eight knots, but it can get up to a top speed of 20 knots using the all-electric motors.

The SILENT-60 comes with four guest cabins but can be designed with a custom layout for those willing to pay a bit more. Speaking of which, the SILENT-60 starts at 2.39 million euros ($2.69 million).

The first of these SILENT-60 solar yachts was built in Thailand, but the company plans to build future units in Italy. Furthermore, Silent Yachts has already shared design plans for a SILENT-80 and SILENT-100 Explorer vessel.

More electrified boats are sure to make their maiden voyage soon. In the meantime, check out this launch video detailing the style and luxury of the SILENT-60:

Electrek’s take

The more I see electric propulsion on larger and larger boats, the more excited I get. While this is still such a niche segment in not just maritime transportation, but electrified mobility overall, it really excites me personally.

Many of you (hopefully) saw my previous article where I got to captain a solar-powered yacht called the Ramblin’ Rose, thanks to Sunwater Marine . That experience helped me learn and experience a lot of similar technology that Silent Yachts has implemented on an even larger and more powerful scale with its catamarans.

While it’s safe to say that my current income level might get me on board a SILENT-60 solar yacht as a mere stowaway, those who can afford their own are going to be blessed with luxury and performance with zero emissions. The quicker we stop burning diesel in our Earth’s waters (and anywhere else while we’re at it), the better.

A top speed 20 knots is nearly 23 mph, not bad for two electric motors getting all their energy from the sun. Obviously, that speed is not sustainable for the batteries, but being able to get 100 NMs from the sun each day truly means you can take this yacht out for weeks at a time if you want. Not to mention the unique wing kite that actually pulls the 60-foot yacht, unlike a sailboat that is pushed by the wind. No range anxiety here.

I’d love to get below deck on one of the Silent Yachts and explore the inner workings… while getting a tan in the Mediterranean, perhaps? A kid could dream, right? For now, I’ll simply have to report electric boat news from my squeaky chair, pretending the cars whizzing by outside are calm ocean waves lapping against the yacht’s hull. Is it too early for a mojito?

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Scooter Doll is a writer, designer and tech enthusiast born in Chicago and based on the West Coast. When he’s not offering the latest tech how tos or insights, he’s probably watching Chicago sports. Please send any tips or suggestions, or dog photos to him at [email protected]

The award-winning entry to solar-electric yachts

As the successor to the Silent 64 (the first ever solar powered production yacht to cross the Atlantic Ocean during January of 2018), the 60 Series is equipped with the most refined, efficient and clever technology available today. Being a multi-award winner, including the prestigious “Best of Boats Award” in the category of ‘Best for Travel’, she embodies solar electric yachting in its purest form. Available in a variety of deck and cabin options, the Silent 60 is ideally suited for families cruising with or without additional crew.

Specifications

Deck options, silent 62 flybridge.

The flybridge version with a retractable roof offers enough space for a dining area with a small lounge and a dedicated helm station. For owners who do not need the additional space of the 62 3-deck configurations, the flybridge version offers enough space and outstanding 360° visibility.

Silent 62 3-Deck Open

An additional open deck instead of the flybridge combines the benefits of larger catamarans with the compact dimensions of the 60 Series. The open sky lounge is a fantastic outdoor community space, equipped with a full dining area including a panoramic view and a superyacht atmosphere.

Silent 62 3-Deck Closed

The closed version of the 62 3-Deck further develops her character as a compact superyacht. Providing additional indoor space, the closed third deck is available in two options: a choice between a sky lounge or an exclusive owner’s deck makes sure it can be tailored towards individual needs.

Model variations

Front Master Version

• Available for every deck option (flybridge, 3-deck open & 3-deck closed versions)

The Master cabin is located below the bow in the front of the main deck. This replaces the additional exit in the front of the salon.

Front Exit Version

Hereby the salon on the main deck is equipped with an additional exit in the front. The Master cabin moves to the side of the hull in the lower deck.

3-Deck Open

3-Deck Closed

Front Master

Solar-electric yachting advantages

Unlimited range, noiseless cruising, zero emission, minimal maintenance, powertrains, 6o series highlights.

Kite sail system

Adding the option of a fully automatic towing kite gives the 60 Series the opportunity to make use of the wind without shading the panels. The either 9m² or 12 m² sized kite flies at heights where winds are much stronger, thus being able to create up to 10x more pulling power compared to a conventional sail.

Self-sufficient lifestyle

Designed from the ground up to be fully autonomous. By being able to produce your own energy and water while making use of coolable food supplies for storage as well as a worldwide internet connection, you have the possibility of creating a fully self-sufficient lifestyle on board.

Bridgedeck storage

Under the bridge deck, there are two spacious storage boxes for SUPs, surfboards, small RIBs or compact sailboats. Both of them can be accessed either from the aft cockpit deck or directly from the hydraulic tender lift.

Owner's suite

Being able to design the 60 Series with an exclusive owner’s suite on the 3rd deck us unique amongst 60-foot catamarans. The suite itself is fully equipped with an en-suite bathroom and measures 23 m² in size. It also gives direct access to the 36 m² lounge area in the aft.

8 Years Warranty Battery Banks

4 0 years warranty solar panels, lifetime warranty electric motors, ce-a category 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

120 Explorer

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.

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