... 12 bit A/D high-precision sampling 4.Full electronic protection PWM solar charger controller 20A 12/24VProduct ... PWM charging with temperature compensation·Use MOSFET as electronic switch, without any mechanical switch·Widely used, automatically recognize day ... control mode·Gel, Sealed and Flooded battery type option·Electronic protection: Overheating, over charging, over discharging, overload, ...