JoyiQi PWM 20A Solar Controller/Regulator Power Charge Controller/Regulator 12V/24V 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