A solar charge controller is used to keep the battery from overcharging by regulating the voltage and current coming from the solar panel to the battery. Solar charge controllers are an essential element to any off-grid solar electric panel system. What size do you need? Add up the total watts of solar panels and divide by either 14.4 for 12-volt systems 28.8 for 24 volts or 58.8 for 48-volt battery banks. This will give you maximum output amps from the controller.

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