YueYueZou&reg; 20A Charge Controller Solar Charge Regulator Intelligent USB Port Display 12V-24V Floating Charge Voltage (HVD 13.3V-15V), Recovery After Under Voltage (LVD 11V-13.5V) Under Voltage Protection (RVD 9V-12.3V), Load Mode (24hours,1-23hours,0hour), Battery Option (GEL,LEAD-ACID,FLOODED) It is designed for high quality and high reliability. Solar controller is fully automatic and requires no adjustments or user selections. Overloading & short-circuit protection.Reverse discharging & reverse-polarity protection. Easy to set up and operate.Suitable for Home, Industrial, Commercial etc.