Brunton SolarController 12V Battery Charge Monitor for safe solar charging. Prevent overcharging of 12V batteries when using solar panels. This 12V Battery Charge Monitor from Brunton is an excellent companion to their solar panels. It helps prevent overcharging of 12V batteries when you are using solar panels that provide more than 10 watts of power. This unit can handle up to 100 watts of electricity. Approx. dimensions: 3 3/4 x 2 3/4 x 1" ; weighs 4 1/4 ozs. Comes with a 1-year limited warranty. Get one today at a great price! Brunton SolarController 12V Battery Charge Monitor