Features:1.Automatically manage the working of solar panel and battery in solar system.2.Overloading and short-circuit protection. Build-in short-circuit protection, open-circuit protection, reverse protection, over-load protection.3.Protection from lightning strike4.Prolong the battery life cycle and keep the load work well.5.Easy to set up and operate.6.Big LCD display,all adjustable parameter.7.Fully 4-stage PWM charge management.Description:Suitable for small solar energy system.Specifications:Material: plastic and metalSize: 133 x 70 x 34mmType: 20AColor:black and blueModel Name: RBL-20A(20A)Rated Charge Current:20ASystem Voltage: 12/24V DC AUTOMax. PV open circuit voltage:50V(24V System) 25V(12V System)Max. PV input power: 240W when your battery is 12V;480W when your battery is 24VPackage Included:1x Solar Charger Controller