Specifications: Rated Voltage: 12V 24V Auto Application: Solar System Controller Current: 10A 20A 30A Package: 1x Solar panels Battery Charge Controller With Timer and light sensor it could work for solar light system. Only For off-Grid PV Solar System. For 10A 12V Pv System: 120W Solar Panel 12V Lead-acid Battery 21V for Max input Voltage For 10A 24V Pv System: 240W Solar Panel 24V Lead-acid Battery 42V for Max input Voltage >> SAFETY INSTRUCTIONS 1.Make sure your battery has enough voltage for the controller to recognize the battery type before first installation. 2.The battery cable should be as short as possible to minimize loss. 3.The regulator is only suitable for lead acid batteries: OPEN AGM GEL it is not suited for nickel metal hydride lithium ions or other batteries. 4.The charge regulator is only suitable for regulating solar modules. Never connect another charging source to the charge regulator. >> PRODUCT FEATURES 1.Build-in industrial micro controller. 2.One-key setting digital display auto memory function. 3.Fully 4-stage PWM charge management. 4.Build-in short-circuit protections open-circuit protections reverse protections over-load protections. 5.Dual mosfet Reverse current protections low heat productions. >> SYSTEM CONNECTION 1.Connect the battery to the charge regulator - plus and minus.it will show 1 if it detects 12V battery 2 if it detects 24V battery. 2.Connect the photovoltaic module to the regulator - plus and minus. 3. Connect the consumer to the charge regulator - plus and minus. The reverse order applies when deinstalling! An improper sequence order can damage the controller!