Mohoo 30A Charge Controller Solar Charge Regulator Intelligent USB Port Display 12V-24V The product can automatically manage the working of solar panel and battery in solar system. It is easy to set up and operate.For protecting the lifespan of your battery, once the voltage of the battery drop below 8V, the solar controller will turn off automatically (LCD will be unavailable at the same time). Change the default setting of solar controller, requires:firstly,Disconnect the solar panel.Secondly,ensure the remain voltage of battery no less than 12V. Caution:Controller should connect the battery first,and then connect the solar panel,and finally the load!The disassembly sequence is contrary to the wiring order ! Solar controllers are built-in electronic fused that do not require replacements.Overloading & Short-circuit protection, Reverse discharging & reverse-polarity protection.Easy to set up and operate. Suitable for home, industrial, commercial etc. The controller has a low failure rate and will last a long time and protected with moisture-tight coating, minimizing damage from humidity and from nesting insects.