Nominal discharge current: 20A; USB output voltage: 5V/3A; Battery voltage: 12V / 24V automatic. Adjustable power rate with dual USB ports; 3-stage charge management (Bulk, ABS, Float) and 4-stage PWM charging. Function: Equipped with an industrial STM 8 microprocessor to control the charger and discharge process, and it has a reliable battery to manage the charging and discharging period. Multiple electrical protections: over-current and short-circuit protection, reverse connection protection, low voltage and overload protection. Good heat dissipation: double mosfet back current protection, low heat generation (ALL components electronics generate heat when working, it is best to protect them for better heat dissipation, avoid direct sunlight or damp places). Easy to use: comes with a screen that can clearly display status and data, it can switch modes and parameter configuration, suitable for home, industry, commerce, etc. Contents: 1 solar charge controller, 1 user manual. happy meeting