SMAKN&reg; 48V 30 Amp PWM Charge Controller Regulator Off Grid for Battery Charging This controller can charge and discharge at the same time. Electronic Protection; PWM Charge Mode (SOC); Microcontroller Digital Accuracy Double Digital LED Display; Full Automatic operation. High Efficiency PWM charge mode State of charge(SOC), micro controller digital accuracy. Automatic detection of the voltage, short circuit protection.