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If 750 watts is all that the motor and controller can handle then it's less then a horse power, so with the weight of the car, batteries, motor and driver, I would guess you are going 5-10mph up hills, is that correct?
It boils down to that your motor and speed controller are way to small for what you are asking them to do.
The speed controller is the box between the motor and the batteries, is there any info on it? is it labeled for peek output or peek amps?
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