Features: 12V/24V auto adapt,LCD display,USB Charge Automatically manages the working of solar panels and batteries in your solar system. Overloading & short-circuit protection. Reverse discharging & reverse-polarity protection. Under-voltage and over-charging protection. Protection from lightning strikes. Prolong the battery life cycle, and keep the load working well. This controller can charge and discharge at the same time. It has a perfect SOC function,control charge current, and supply power to the loads. The controller will automatically compensate the temperature of the charging voltage according to the changes of ambient temperature. Specification: Battery Voltage: 12V/24V auto adapt Current:20A Max Solar input:<50V Charge drop:<0.2v Discharge drop:<0.25v Equalization: 14.4v/12v system,28.8v/24v system Acceptance:14.2v PWM/12v system,28.4v PWM/24v system Float:13.7v(adjustable)/12v system,27.4v(adjustable)/24v system Charge reconnect:12.6v(adjustable)/12v system,25.2v(adjustable)/24v system Discharge stop:10.7v(adjustable)/12v system,21.4v(adjustable)/24v system Discharge reconnect:12.6v/12v system,25.2v/24v system Self-consume Load 8 amp Max On/Off Load is for small amp light etc. Heavy load items fridges etc, std method connect direct to the battery on all regulators. USB output: 5V/2A max Operating temperature:-35 degree -- +60 degree Size/Weight:150*78*35mm/150g 1 Year Warranty Safety Instructions: Make sure your battery has enough voltage for the controller to recognize the battery type before first installation. The battery cable should be as short as possible to minimize loss. 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. The charge regulator is only suitable for regulating solar panels. Never connect another charging source to the charge regulator. System Connection: Connect the battery to the charge regulator - plus and minus. Connect the solar panel to the regulator - plus and minus. Correct wiring method for heavy amp accessories, is to connect them direct to your battery Package Includes 1 X 20amp Solar Charge Controller 1 X User Manual