The total power of the total 6 ports of the AC output port is less than 2100W, which can be used for a long time. When 2100W≤load<3000W, work for 2min; 3000W≤load 4000W, work for 5s; 4000W≤load work for 1s; when the output is overloaded, the AC icon on the screen flashes, and the buzzer hint. At this time, it is necessary to remove the overloaded electrical appliances, and press the AC switch key again to restore the output.