The off-grid solar power system uses solar panels to convert solar energy into electrical energy when there is light, and supply power to the load through the solar charge/discharge controller and charge the battery at the same time; in cloudy weather or when there is no light, the DC load is supplied by the battery set through the solar charge/discharge controller, and the battery also has to supply power directly to the independent inverter, which is inverted into AC power through the independent inverter to supply power to the AC load power supply through independent inverter.