Wednesday, June 10, 2020

Re: [electricboats] AC vs DC gensets, how many?

Well, there’s no actual system yet except in my head.
I would certainly like the ability for the motor to act as a generator when running under diesel.
i understand though that it depends on the type of motor - AC, BLDC, BDC? Still learning...

Question - if we did have a 10kW continuous motor Acting as a generator, probably using a 2:1 or 3:1 reduction (or opposite!) to keep the same prop as diesel, how much of the diesel power will I lose to the New “alternator” and how much of that will actually get back to the batteries?  For example, if at half max rpms the diesel is putting out 20 kW (in hp :), would I lose half the 10kW =5kW into the electric-now-generating? So only 15kW getting to prop (ignoring loss for stern gland)?  If so, how much of the 5kW would actually recharge the batteries - ie. would a 90% efficient motor recharge at 90% to?

We will definitely be running all DC if possible.

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