... with Parameter Changeable. 2,Gel, Sealed and Flooded batt Solar System Controller with (NEW) ---------ViewStar Series The controller ... optionBackup battery, no need to reset the time after power failureHigh efficient Series PWM charging mode &state of charge ... Over Discharging, Over load , and short circuitReverse Polarity protection: Solar Module, BatteryLoad work mode: ON/OFF,Dusk to Dawn,Light ...