This is a microcontroller-based charge controller, for automatic, intelligent operation with 12V solar panels and 12V battery systems. It has 3 stage charging (bulk, absorption, float) for 100% return of capacity and long battery life. It can be used with 2 types of batteries: flooded/web cell or sealed AGM. Automatically turns on lights when dark and turns off during the day. Comes with MOSFET-based reverse-current blocking to prevent night-time battery discharge and lowers power loss.