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1, the generator is parallel to the battery, and the battery negative pole must be grounded. The positive pole of the battery is connected by the ammeter (or directly) to the positive pole of the motor. The static electromotive force of the battery is often 11.5V to 13.5V, and the output voltage of the generator is often limited between 13.8V and 15V (24V electrical system 28V~30V). When the generator operates, the normal voltage is 0.3 to 3.5V higher than that of the battery. This is mainly to overcome the voltage drop of the circuit, so that the battery can be recharged and not overcharged.