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You are not better of using the generator instead of batters. using the generator you will need to have investor plus the speed controller (PWM) to control the DC motor. Or if you use a AC motor you will need a frequency control to control the speed. It is throw that energy is not lost but transform, you will have to coll of the electronics that are getting hot because of the wiring and the constant convention of AC to DC, or AC to DC and AC(new frequency). So batteries will be more efficient if you plan to use the car in small trips.
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