What does the company name Evoy stand for?
Evoy comes from the term Electric Voyage. A voyage is by definition: “A long journey involving travel by sea or in space”. Evoy will focus on the sea travel firstly, then ocean space later.
What does Evoy mean by boat? What is the size of fast boats you recommend for your system for?
A boat is in Evoy’s view between 0 and 15 meters or 0 and 50 foot. Good fits for our system are typically planning hull boats with inboards between 20 and 30 foot. The reason is that size effects energy consumption, at the same time as having fairly heavy ICE systems installed. However, when removing an ICE system either in real life or during planning for new boats this will free up a lot of weight that can be used for the electric propulsion system. Since the motor and converter typically only weigh between 100 and 200 kg (depending on specification on the boat) that again means there is a lot of room for the batteries, which again gives an acceptable range for most.
Where do I buy my Evoy Electric Propulsion System and how long does the delivery take?
For now, you can talk with our existing dealerships and boat making partners. We are aiming to have the first deliveries in Q3 2019. See our regional partners and boat builders listed here.
Is Evoy systems just for new boats and businesses? Do you do retrofits?
Evoy’s standardised turn-key system can be used in both new and used boats. We have regional partners for retrofitting. To see our regional partners, click here.
How long time does it take to earn back the higher cost of first time investment?
This is very dependent on the system that is ordered and particularly the size of the battery system as it is the most costly part for now. But the calculations we have done so far, the ROI is typically between 500 and 1000 hours.
What are the benefits of electric propulsion?
Silence, zero emissions and low operating cost are the core benefits of an electric propulsion system. Evoy’s system will not compromise your current boat usage, allowing you to use your boat how, when and where you want. The use of a lightweight electric motor, efficient battery management and maritime batteries make this possible.
Isn’t it easy to run out of battery mid-trip?
At Evoy we have thought carefully about how to maximise range. Our range rings on our display unit and our energy management system allows you to understand your speed and power constantly. This ensures that with a slight speed adjustment, you can get to where you want to go. As a rule of thumb, you quadruple your range if you reduce from a plane hull speed to below 5 knots.
What is the conversion rate between kW and hp?
1hp = 0.74kW. Evoy offers 100-450kW systems meaning 135-600hp.
How long does it take to charge my batteries?
Evoy has developed a range of different charging options. Our standard 11kW system can charge a standard Evoy system (a 100kWh battery) in 10 hours, whilst our supercharging 300kW system can be charged in 30 minutes.
Doesn’t it pollute when they produce the batteries?
Evoy has spent significant time and resources in evaluating battery suppliers that manufacture sustainably. Batteries from DNV-GL have met strict environmental requirements (see here). Evoy has also gone one step further and decided to use Chooose to carbon offset all other aspects of our business and production. See more about Chooose here.
The energy source in my country is not just renewable energy, how much do I pollute using the boat?
At Evoy we have found that 1kWh would equate to 0.94 kg of CO2 from 100% coal generated electricity (according to CNEF). Whilst 1 litre of diesel would equate to 2.68 kg of CO2 (according to Exeter). Therefore, even if your electricity is produced from unsustainable means, our Evoy system will reduce your emissions by 65%.
How long does it take before I have to change the batteries?
Our batteries have been rated for 13000 cycles when used to 80% depth of discharge (original capacity of the battery).
How reliable are electric propulsion systems?
Electric propulsions systems are highly reliable. The reason for this is the simplistic system of an electric motor and the marine engineering of our electric management system. Simply put, our system has 4 moving parts whilst on average a combustion engine has over 200 moving parts. This explains how Evoy can achieve a highly reliable and robust system.
Do you refer to the peak or continuous power of the electric engine?
As our system has been designed for commercial use we have derated our system to continuous power.
Won’t the extra torque kill my stern drive? Can I keep the same propeller?
Evoy’s computerised engine controller can be set with parameters that match the stern drive’s torque ratings. Retaining the existing propeller is most likely an option as the computerised engine controller and electric motor can be selected to match rpm and torque. However, changing the propeller may be desirable in order to achieve increased operational efficiency. In a retrofit, we will usually recommend that the stern drive is changed at the same time as the propulsion system. The main cause is that when an ICE goes in gear it connects with 600 – 1000 rpm which can be really hard on the stern drive. This is avoided with electric drive as it is controllable all the way from 0 rpm and we recommend you to start with a clean sheet, so you do not have any unpleasant surprises with your drive.
Some claim my boat will plane faster and easier with electric propulsion, is that true?
Torque is no longer a factor with electric systems. The full torque from 0 rpm (or as programmed to fit your choice of tech to transfer the power to the water) from an electric propulsion system allows you to achieve a plane with your boat more efficiently and faster.
Can I mount solar panels to extend my range?
You can add solar panels to your boat and integrate them with our system. However, the limited surface area on a boat, plus the additional weight of the panels may reduce the effectiveness of adding solar panels. Therefore, for optimal speed and range, we recommend that people use land-based charging stations instead of onboard solar system installation, but this depends hugely on the boat. For fast boats, this usually holds true with today’s technology.
You say Evoy will have full autonomy with time, what is that?
Autonomy is commonly divided into 4 or 5 steps. At “entry level” a system allows you to follow a route that is plotted on your navigation aid, either manually or automatically (auto-routing), whilst requiring the navigator to constantly monitor the system. However, with “Full Autonomy” (Stage 4 or 5) you and your boat can travel from A to B without the need of human interaction, even including docking. This is where Evoy will be with time.
How fast can I go?
That is fully dependent on the boat and how big a system is installed. As a general, you can expect a higher top speed than with your current ICE installation.
How far can I go?
This is dependent on the material type of your boat and your desired range. At Evoy, we aim to offer a 25 nautical mile range at a 35 knots speeds and a 100 nautical mile range at 5 knots.
This is fully dependent on the boat and the size of the system that you put in it. However, with today’s battery technology you can expect between 25 to 50 nautical miles at a planing hull speed. At a slower speed, below hull speed (approximately 5 knots for a 25-footer), this range can be quadrupled.
What is ICE?
ICE stands for an internal combustion engine, which is what the majority of marine inboard and outboard engines consist of.
When will Evoy deliver to my country?
We are looking at international sales and dealership partnerships. Many of our current suppliers and boat makers offer their products internationally. With time we too will be across the globe.