Product Description:<br /><br />    Brand New And High quality<br />    Rated Voltage: 12V 24V Auto<br />    Application: Solar System Controller<br />    AUTO DETECT   AGM・ GEL・ OPEN<br />    Current: 10/20/30A<br />    With Timer and light sensor・it could work for solar light system.<br />    Only For off-Grid PV Solar System.<br />    For 12V Pv System: 120W Solar Panel・12V Lead-acid Battery・21V for Max input Voltage<br />    For 24V Pv System: 240W Solar Panel・24V Lead-acid Battery・42V for Max input Voltage<br /><br />SAFETY INSTRUCTIONS:<br /><br />    1.Make sure your battery has enough voltage for the controller to recognize the battery type before first installation.<br />    2.The battery cable should be as short as possible to minimize loss.<br />    3.The regulator is only suitable for lead acid batteries: OPEN・AGM・ GEL<br />    it is not suited for nickel metal hydride・ lithium ions or other batteries.<br />    4.The charge regulator is only suitable for regulating solar modules. Never connect another charging source to the charge regulator. <br /><br />FEATURES:<br /><br />    1.Build-in industrial micro controller.<br />    2.One-key setting・digital display・auto memory function.<br />    3.Fully 4-stage PWM charge management.<br />    4.Build-in short-circuit protection・open-circuit protection・reverse protection・over-load protection.<br />    5.Dual mosfet Reverse current protection ・low heat production.<br /><br />SYSTEM CONNECTION: