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Throttle is proportional to current, so if you give it 50% throttle, the controller will do everything it can to get 50% of max current. Max current is 500 amps, so it will attempt to get 250 amps from that poor little 12v battery. It will fail in that attempt, so it will run the PWM duty all the way to 100%. The software is designed for controlling higher voltages and heavy vehicles. 50% of full throttle when you are just taking off feels nice and gentle. But it's still 250 motor amps. It just doesn't seem very ideal when driving a little 12v motor in a garage.
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