When P2001 is charging by home outlet, and the AC port has output, P2001 will switch to 1100W UPS mode. At this time, the maximum output power of the AC port is only 1100W. If P2001 AC output is larger than 1100W，it will be in overloaded mode. Except for electrical appliances (rated AC input larger than 1100W), press the AC button again to restore the AC output, or cut off the home outlet, then P2001 can restore 2000W power output.