The electric vehicle controller is designed to be 48 volts, slightly higher than 48 volts to work, when the voltage is 47 volts when the controller stops working, the car can not drive at all, if you want to change 36 volts, you must change the 36 volt controller, the electric vehicle motor was originally designed to use 48 volts, if you use 36 volts, The power of the motor is more than half of the original reduction [motor power = current x voltage, the voltage is reduced, the current is also smaller than the original], if the original motor is about 350 watts, now it can only be about 150 watts, the car power is too small to walk, so the battery voltage is not worth the loss.