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Just as an example if I take this generator 350W at 24V gives us about 14.6A (P=I*V). That means the internal resistance of the motor is 1.6 Ohms (V=I*R). What I've always used for calculating power loss in a wire is P=V*I^2; which gives us 350W. That would mean that the efficiency of a generator is 50% but I've always understood that under optimal circumstances generators operate closer to 90% (just talking about the efficiency of mechanical rotation to electrical power, not including the efficiency of producing that mechanical rotation). I'm not surprised that the values are coming out the same since I'm using the same equations in reverse.

Thanks for the help.