SMAKN&reg; 12V/24V 30 Amp PWM Charge Controller Regulator Off Grid for Battery Charging Solar regulator for street light, Dual load function, Battery type selection, Full electronic protectio High quality, efficient and reliable Solar Power Regulators They are perfect for rural electrification system Electronic protection:Overheating, over charging, over discharging, overload, and short circuit Reverse polarity protection : Any combination of solar module and battery