Interestingly many motors used in boats are PMAC - permanent magnet AC 3-phase motors. These are controlled by a controller (such as Sevcon Gen4) that converts 12VDC to the AC to operate the motor.
that said, your idea to use an AC motor powered by your existing inverter and battery bank is doing essentially the same thing. You are still using your DC battery to power the motor.
bottom line - if you want to propel your boat using an electric motor the power has to come from somewhere. Either a generator (serial hybrid) or a battery - which in turn can be charged by solar, wind, shore power or a generator.
why reinvent the wheel when dc-powered systems are available and proven? Check out www.thunderstruck-ev.com.
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