Features: Automatically manage the working of solar panel and battery in solar system. Overloading !#!amp!*! short-circuit protection. Reverse discharging !#!amp!*! reverse-polarity protection. Under-voltage and over-charging protection. Protection from lightning strike. Prolong the battery life cycle and keep the load work well. Easy to set up and operate. Suitable for small solar energy system. Specification: Voltage: DC 12V / 24V Self-consuming: 10MA Rated Charge Current: 20A Rated Load Current: 20A Over charge: Protection: 14.4V / 28.8V Floating charge: 13.5V / 27V Recover: 13.2V / 26.4V Over discharge: Protection: 10.8V / 21.6V Recover: 12.3V / 24.6V Load over voltage: Protection: 16.5V / 34V Recover: 15V / 30V Max open-circuit voltage of the solar panel: 25V / 36V Operating temperature: -20C-50C Color: Black Item size: 10.2 * 9.5 * 3.8cm / 4 * 3.7 * 1.5in Item weight: 120g / 4.1oz Package Included: 1 X Solar Charge Controller