1Efficient MPPT controller algorithm, MPPT efficiency is not less than 99.5%, the conversion efficiency of the whole machine is up to 98%, and the products have passed CE, ROHS and FCC certification. 2The charging method, the third-stage charging (constant current, constant voltage, floating charge) effectively extends the life of the battery. 3The output modes are normally open mode, normally off mode, PV voltage control mode, dual time control mode, PV voltage and delay control mode. 4Customers can choose to charge 3 types of commonly used batteries (sealed lead-acid batteries, gel batteries, open lead-acid batteries), and can be customized to charge other types of batteries. 5The controller LCD displays various parameters such as system type, PV input voltage, PV input current, day, month, total power generation, battery type, battery voltage, charging current, charging power, discharge current, and discharge amount.