When P2001 is working, there will be self-consumption power. Different ports have different self-consumption power when they are turned on. The DC port is about 8W, the USB port is about 5W, and the AC port is about 25W (the higher the power of the AC transformer,and the self-consumption power will be larger), all ports of P2001 comply with industry design standards, and some of the power consumption is better than that of similar competing products in the industry. When using the load device to discharge, it is necessary to increase the self-consumption power when calculating the battery capacity. usage time = nominal capacity * 90% ÷ (load power + port self-consumption power)