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The Coleman 30 Amp Solar Charge Controller prevents overcharging of 12 Volt batteries. It is intended for use with 12 Volt solar panels, and can handle up to 30 amps of array current and up to 450 Watts of solar power. This unit will provide maintenance free protection of your solar panel and batteries. The controller will automatically indicate the charged state of your battery on the LED status indicators. It is is designed to work with a variety of 12 Volt solar panels.