Stephan Hinni wrote:
My idea is to use the yacht for scuba diving and pleasure trips. I'd
like to cruise at 6 to 8 knots and have a daily range from 40
nautical miles.
I want to use two 10 kW Mars Motors and let them run at 72 Volts.
Battery storage is no problem once the gas engines are out! The
battery charging is at the slip (110V) and while navigating 4 Solar
Panels bring in a bit of extra amperes. A gas generator is on board
too but it have to be fixed first.
The yacht is currently powered by 2 Chrysler 250HP gas engines. The
length is 30.4 ft, breadth is 12.8 ft and she weights 16000 lbs. The
propellers are 16RH16 and 16LH16 and the gear ratio is 1.52:1.
Even with some added weight from the batteries your boat should run
at about 6 knots at 20 kW power.
So 40 miles take 7 hours, using 7*20 = 140 kWh net energy. With
lead-acid batteries at 50% depth of discharge this would add around
15000 lbs to the weight, so this does not look realistic. Lithium
batteries at about 80 or 90% d.o.d. would weigh in at around 4000
lbs and would cost you a small fortune.
--
Hans Rijnbout
Utrecht, Netherlands
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