The Residential Energy Storage Inverter Upconverter integrates the temporary storage of green energy such as solar and wind power in a battery system, and sends it out to a three-phase AC step-up transformer via an energy storage inverter when necessary. It effectively addresses the instability and periodicity issues of wind and photovoltaic energy. The unit consists of an energy storage inverter (PCS), busbar bridge, low-voltage room (communication + power distribution), oil-immersed transformer, high-voltage room (with vacuum load switches/circuit breakers), and the unit's outer shell.