Features - Solar Charge Controller regulates the voltage from solar panels going to battery. - Build-in industrial master chip to control the charger and discharge process.Parameters are adjustable. Prolong the battery life cycle and keep the load work well. - Professional PWM charge management, all necessary protections equipped. Short-circuit protection, open-circuit protection, reverse polarity protection - LCD screen with backlight function clearly indicates status and data. - Easy to install and operate, suitable for home, industrial and commercial solar energy system application. Specifications - Color: Color: Black. - Material: Plastic. - Size: Approx. 18.8 x 5.2 x 9.2 cm. - Battery Voltage: 12V/ 24V. - Charge Current: 20/30A - DC: 12V - Floating impulse voltage: 13.7v / 27.4v - Undervoltage protection: 10.5v / 21v - Under voltage recovery: 12.2v / 24.4v - Loop pressure drop: 170mV - Temperature compensation: - 4 mv/Cell / - Working temperature: - 20 ~ 60 - Storage temperature: - 30 ~ 70 - Humidity: no more than 90%.