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Rated discharge current: 20 A; USB output voltage: 5 V/2 A; battery voltage: 12 V/24 V car. Avoid detection errors of the controller: the battery must be connected first! !!! and then connect the solar panel. !】 Safety protection: built-in short circuit protection, idle protection, reverse protection, overload protection. With full 3 level PWM charging management. Good heat dissipation: dual mosfet reverse current protection, low heat production. Adjustable power rate with two USB ports; 3-stage (bulk, ABS, float) charging management and 4-stage PWM charging Functionality: Built-in industrial microcontroller. Both charging and discharging parameters are adjustable. The charging mode can be adjusted. Easy to use: comes with a display that can clearly indicate the status and data, it can conveniently switch modes and parameter configuration, suitable for home, industrial, commercial etc