Here is the best project kit from Edgefx on solar panel charge controller to protect battery from over charged, a transistor is used to bypass the solar energy.
http://www.edgefxkits.com/solar-power-charge-controller
http://www.elprocus.com/solar-charge-controller/
http://www.elprocus.com/sun-tracking-solar-power-system/
Post time: Jun-19-2017