The embodiment of the present application discloses a method, device and system for output power adjustment as well as a storage medium. The method comprises the following steps: when the output power supplied to a load by a first inverter is detected to be greater than a rated power or the ratio between the output power and the rated power is detected to be less than a preset threshold, adjusting a first power weight coefficient of the output power in the total power of the load; obtaining first power information of the first inverter and receiving second power information and a second power weight coefficient sent by at least one second inverter supplying power to the load; and adjusting the output power according to the adjusted first power weight coefficient, the second power weight coefficient, the first power information and the second power information. The embodiment of the present application can improve the flexibility of power allocation and the stability of an inverter parallel system.
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