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Q&A2018-07-16T21:06:53+00:00
What is the price tag of a SILENT yacht?2018-07-10T07:21:52+00:00

Hybrid systems and Epoxy-Carbon-constructions are usually expensive. SILENT yachts are the proof, that these up to date technology is affordable. Our yachts are within the same price-range as conventionally powered and constructed sailing- or motor-yachts of the same size.

How does cooling and heating work?2018-07-04T18:07:14+00:00

When the windows have to be closed in bad weather or when mosquitoes are outside, you will enjoy using the unique aeration-system. It is installed in all cabins, bathrooms and the saloon. It provides individually adjustable cool and fresh air at any time. It also can be combined with the air-conditioning. The roof  overhang and the UV protection of the saloon windows also help to keep the inside of boat cool. In reverse mode the heat-pump provides a cosy interior for an all-season use.

What is the difference between a Silent Yacht and a conventionally powered yacht?2018-07-04T13:52:22+00:00

Conventional motoryachts are powered by diesel- or gas-engines. Additionally they use to have a generator on board to supply all household appliances.

Depending on the size of the yacht, in sum 2 or 3 diesel-engines are working for propulsion and household.

Also sailing-yachts need a diesel-engine. Depending on the operational area and the wind- and weather-conditions, additionally to the sails a diesel-engine is needed for the propulsion of the boat. When anchored in a quiet bay, the diesel-engine ensures the energy-supply of the consumers.

Most yachts are using gas for cooking, the open flame heats up the interior of the yacht and cause an imminent threat. On many yachts the consumables like water and energy are managed in a way that enforces the skipper to visit a marina every two or three days to charge the batteries and to buy water for shower and drinking. Larger Yachts operate water-makers, air-conditioning and generators. They do not need to got to a marina but they have to run the generator.

The use of a combustion-engine is inevitably combined with noise, exhausts vibrations and oily films in the water. Is it that, what you are looking for in an otherwise quiet bay?

A conventionally powered boat has a range of 300 to 500 nautical miles under diesel-engine. With a sail the range can be extended – but only when the wind is coming from the right direction and in matching force.

Does the Silent 64 provide different cabin configurations?2018-07-05T10:41:04+00:00

All SILENT yachts can be configured in several different layout versions, here is SILENT 64 as an example:

SILENT 64

  • VERSION 4: galley in saloon, 4 cabins with en-suite bathrooms, all bathrooms incl. sink, electric toilet and separate shower

Other options:

  • VERSION 5: galley in saloon, 4 VIP-cabins with en-suite bathrooms
    One skipper cabin and one skipper bathroom in the forepeaks
  • VERSION 3: galley in saloon, 2 VIP-cabins with en-suite bathrooms in port hull, 1 large master-cabin and master-bathroom at starboard, large storage-room in the stb. forepeek
  • Version 3 + 1: Like Version 3 with an additional crew-cabin with bathroom instead of the storage-room in the forepeek
  • Saloon / Galley similar in all versions
  • VERSION 3 “MASTER SALOON”: large saloon with separate couch- and dining areas, large helm-position and office-desk, 3 VIP-cabins with en-suite bathrooms, separate crew-compartment with galley and skipper-cabin with en-suite bathroom in aft-port-hull
What kind of batteries and storage capabilities are built in?2018-07-04T18:13:39+00:00

Lithium batteries – high energy density,  the same product as Tesla uses. To be more flexible, we always use the latest generation which is a bit more powerful. The storage capacity depends on the chosen configuration, it enables you to go up to 20 knots and to run air conditioning all night without the need to start the generator.

Which company builds the electric propulsion system?2018-07-04T13:34:14+00:00

We do this ourselves by using high quality industrial grade products, which we configure in a special way that makes the system unique.

Can SILENT yachts be built for commercial use, for instance as passenger ferries?2018-07-04T18:17:13+00:00

Yes, we did it already! For commercial use the boat probably has to be customised to your needs. Just as a ballpark figure – for commercial use as a public transport ferry, e.g. with up to 50 seats, the boat requires less interior but more safety-equipment and typical commercial adaptions. Depending on the applicable regulations and required certifications as well as on the chosen options (high power motors, larger battery capacity, VIP version or simple transport version) the price can vary significantly.

Can you summarise the testing process of the first Solarwave 46? What did you learn that has had the biggest impact?2018-07-04T18:18:22+00:00

We ran the following long-term tests:

2005-2009 with a converted Fountaine Pajot 37, in which we installed the same household appliances as on our current boats – fridge, freezer, washing machine, electric oven, induction cooktops, coffee-machine, bread-maker and a water-maker. In addition we installed solar-panels and wind-generators and all necessary equipment to measure the energy production and consumption.

2010-2013 with Solarwave 46, a dedicated solar-yacht which we launched in 2009. More then 12.000 miles exclusively solar-powered, you con find more information here://www.solarwave-yachts.com/english/history
We found out, that spending less is the key factor, so we worked a lot on reducing the energy consumption e.g. by insulation the hull to increase the efficiency of the AirCon and we optimised the hull and the propulsion system for higher performance and less consumption.

How was the decision made to be fully hybrid-electric, with no fuel onboard (except the diesel generator set as a range extender)2018-07-05T10:34:33+00:00

After several years of testing we found out, that the overall energy balance of solar-panels is much better than of a sail. In an average application – holiday boat or world traveller, the energy produced by the solar-panels – which are specially designed for this purpose – exceeds by far the energy produced by the sails for propulsion. It is a simple fact, that you use a sail only a fraction of the time, whereas the solar-panels produce energy every single minute of daylight, energy you can use for propulsion AND for cooking, cooling the boat, refrigeration, washing-machine, water-maker etc.

How many kW do the panels generate?2018-07-04T18:25:54+00:00

On the SILENT 55 about 10 kWp, which results in about 60 kWh per day. This enables you to travel up to 100 miles every day, exclusively powered by the sun and run all the amenities like air conditioning, TV etc. as well as domestic appliances.

What yachts are currently under construction? What are your future plans?2018-07-05T10:43:08+00:00

As of Summer 2018

Boats in water:
* 1 Solarwave 46 Cruiser – launched 2009
* 4 Silent 55 “Sailor” – launched 2017
* 1 Silent 55 “E-Power” – launched 2018
* 1 Silent-Solarwave 64 “Cruiser” – launched May 2016
* 2 Silent-Solarwave 64 “Hybrid Power” – launched 2017 / 2018

Boats in production:
* 2 Silent 55 “E-Power”
* 1 Silent-Solarwave 64 “Cruiser”
* 1 Silent 79 “Cruiser”
* 1 Silent 79 “E-Power

Sea-trials:
* Silent 55 “E-Power” – summer 2018 in the Med / approx. autumn 2018 in Miami
* Silent-Solarwave 64 “Cruiser” – currently in Miami Florida, can be arranged with the owner

What about maintenance and warranty?2018-07-07T18:13:33+00:00
  • Virtually no maintenance – batteries, panels and e-motors are free of maintenance. Service interval for the only part you must look (the 2 bearings of the e-motor) after about 100.000 hours. Then the costs to exchange the 2 bearings is about 100 USD
  • The batteries have a warranty of 10 years, in 12 or 15 years you will get Lithium batteries of latest technology for less money than today.
  • The solar panels guaranteed lifespan 25 years – the same like with the batteries – in 25 years solar panels will be cheaper and more efficient.
  • Only the small generator which is on board for safety reasons needs some attention. Last year we spent 300 USD for the service of the Generator on our demonstration yacht – ridiculous for about 4.000 miles on e-motors…
Do you provide enough energy for a Water Maker?2018-07-07T18:19:18+00:00

Estimating 8 guests and 3 crew, the 1,000-liter tank would require a water-maker.  Water makers are very efficient, however also some bigger loads say 50 liters per hour. So you need ~ 0.250 kWh for a 10-hour run ~ 2.5 kWh to make 500 liters.
Exactly – a water maker of 100 liter/ hour is what we would usually propose to our customers

Which CE Category you provide for a SILENT Yacht?2018-07-07T18:22:34+00:00

All our Yachts come with CE Category A! *) This is the highest class in Europe. Silent Yachts are designed to circumnavigate the world. If you require further reinforcement of the hull e.g. against ice, we can discuss it and build it accordingly.

*) CE A Certification means: 
Category A: Ocean. This is the category with the toughest standards and covers vessels of 40’ and over designed to be self-sufficient for extended voyages. It is defined as the “category of boats considered suitable for seas of up to 23 feet (7 meters) significant wave height and winds of Beaufort Force 9 (41-47 knots) or less but excluding abnormal conditions such as hurricanes.”

Can the generator both charge depleted batteries and power the ship (e.g. air, stove, lighting) while the boat is underway?2018-07-07T18:27:50+00:00

Yes, of course. Just to make this clear: The generator recharges the batteries when necessary. It is NOT required to start the generator for the operation of household appliances, not even for cooking. You do not even need to start the generator for higher speeds. Only when you go for a longer distance at higher speed the batteries could get depleted, so it is best to start the gen in such a case. Just to give you an idea – you can go for 12 hours solely on batteries (during the night) at 6 knots speed. About 100 nm per day are feasible without starting the generator. If you want to go faster, the gen runs a short time a day.

What about the Sky Sails System? Is it available for all types of your yachts?2018-07-07T18:57:53+00:00

The Sky Sails System is available for the SILENT 75. The price is almost similar to a complete performance rigg (including sails, all winches, rails, blocks, ropes, mast, boom, stays and all other parts and reinforcements required for a standard rigg) but Sky Sails comes with the big advantages of a kite:

  • does not create any shade on the solar panels, which doubles the energy production per day.
  • has a much higher performance than a sail on courses from 90 – 180 °.
  • significantly less and lower cost maintenance than sails
  • safer, quieter, up-to-date technology

An article about the cooperation between Sky Sails and SILENT-YACHTS you can find here. More details about the Sky Sails system you can find in this document.

Sky Sails is NOT available for the SILENT55, which has the sail option instead, as the Sky Sails System which is currently  available is too big for the 55.

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