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A charge controller or charge regulator is basically a voltage and/or current regulator to keep batteries from overcharging. It regulates the voltage and current coming from the solar panels going to the battery. Most "12 volt" panels put out about 16 to 20 volts, so if there is no regulation the batteries will be damaged from overcharging.

You can find here for sale two different types of solar charge controllersMaximum power point tracking (MPPT) and PWM (Pulse Width Modulated).

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