The home energy storage system is similar to a miniature energy storage power station, and its operation is not affected by the pressure of urban power supply. The battery pack in the home energy storage system can be self-recharged during the time of low power consumption, and it can be used in the event of peak power or power failure. In addition to being used as an emergency power source, household energy storage systems can also save household electricity costs because they can balance the load on electricity.

      Grid-connected home energy storage system consists of five parts, including: solar cell array, grid-connected inverter, BMS management system, battery pack, and AC load. The system uses a hybrid power supply of photovoltaic and energy storage systems. When the mains power is normal, the photovoltaic grid-connected system and the mains power supply power to the load; when the mains power fails, the energy storage system and the photovoltaic grid-connected system jointly supply power. The grid-connected home energy storage system is divided into three working modes, mode one: photovoltaic provides energy storage, and surplus electricity is connected to the Internet; mode two: photovoltaic provides energy storage, and some users use electricity; mode three: photovoltaic only provides part of energy storage. The grid-connected home energy storage is shown in Figure 1: