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 sea travel first, 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, in Evoy’s view is between 0 and 15 meters or 0 and 50 feet. Our system is best suited to inboard planing hull boats between 20 and 30 feet. The reason is that size affects 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 can give 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 batteries are the most costly part for now. But the calculations we have done so far, indicate that 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 74-671kW systems meaning 100-900hp.
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?
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 simplicity of an electric motor linked to our marine electric management system. Simply put, our system has four 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?
Our system has been designed for commercial use. We have de-rated 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 reason is that when an ICE goes in gear, it connects at 600 – 1000 rpm which can be really hard on the stern drive. This is avoided with an electric drive, as it can connect to the stern drive at 0 rpm. We recommend you start with a “clean sheet”, by replacing your stern drive, so you do not have any unpleasant surprises.
Some claim my boat will plane faster and easier with electric propulsion, is that true?
Unlike ICE, the full torque of an electric motor can be available from 0 rpm (depending on your programming choices). Thus, 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 and infrastructure.
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 rule, you can expect a higher top speed than with your current ICE installation.
How far can I go?
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. At Evoy, we aim to offer a 25 nautical mile range at a 25 knots speeds and a 100 nautical mile range at 5 knots.
What is ICE?
ICE stands for an Internal Combustion Engine. The majority of marine inboard and outboard engines are ICE.
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.