Re: [electricboats] Silly question - powering with a 120V AC motor?

A 3-phase AC motor is easy to put into reverse mode. "Boating by wire", i.e. putting the helm wherever you want and just running a few electrical cables, is easier with an electric motor.
Efficiencies depend on operating point. Especially with a battery, you can run the genny at its optimum operation point, independently what the propulsion motor requires at the moment. There are diesel electric locomotives for a reason.

The disadvantages that I see (having contemplated that by myself): A quiet genny that uses the surrounding water for cooling isn't easy to find for low power applications (i.e. less than 10 to 20 kW).

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