Electric Yacht

Frequently Asked Questions

Q:  How does the weight of an electric system compare to a conventional gasoline or diesel system?

A:  Depending on battery capacity, a 48V 100AH system weighs less than 350 lbs.  A 48V 200-250AH system will weigh in at around 550 lb.  By comparison, a typical engine, fuel, fuel tank, exhaust and other equipment might weigh in the 400 - 600 lb range.

Q:  Are electric drive systems under powered?

A:  A 48V system has enough power to drive most boats up to 32 feet to hull speed.  Typically, an electric system can replace a diesel or gas engine of twice the HP without significant loss in top speed.  In many cases, customers find it acceptable to replace an ICE of 3 times the HP of the electric.  The loss in top speed is more than offset by the quiet and “on demand” power of an electric system.

Q:  How effective is regenerative charging?

A:  Your propeller size and average sailing speed determine the effectiveness.  Typically, it will serve as a supplement to other sources.  When sailing, you can expect to supply your house power needs and will be putting power back into the batteries.

Q:  What is the range of an electric system?

A:  This is a function of battery capacity, boat performance and power setting. A typical system will have 60 - 90 minutes of run time at full power.  At 6.5 knots, this translates into 6.5 - 10Nm. Reduce speed to 4 - 5 knots and the power consumption drops off dramatically.  Range will increase to 10 – 15Nm.  Range can be extended further at lower speeds.  As a rule of thumb, every 1.25 – 1.5 knot increase in speed requires a doubling of power.

Q:  Can I install the electric motor while still in the water?

A:  Yes. Our system is designed to make installation as simple and easy as possible. Since the existing shaft and propeller are used, it is not necessary to haul out to make the conversion.  We will provide the right reduction ratio to match the motor’s available torque to your propeller.

Q:  What maintenance is required with an electric system?

A:  Very little.  If you have flooded batteries, you will need to check the water level and add distilled water periodically.  Also, grease the output shaft bearings and inspect and clean the battery connections annually.  That is about it!!!  How does that compare to your old A4 or diesel???