The American-style energy storage inverter step-up unit converts solar, wind, and other green energy into a DC current and stores it in a battery system. It can be inverted and sent out to a three-phase AC step-up transformer through the energy storage inverter when necessary, effectively addressing the instability and periodicity issues of wind and photovoltaic energy. The integrated unit consists of an energy storage inverter (PCS), busbar bridge, low-voltage room (communication + power distribution), oil-immersed transformer (including oil-immersed load switch + fuse), high-voltage cable room, and the integrated unit housing.