The household energy storage system is similar to a micro energy storage power station, and its operation is not affected by the pressure of urban power supply. At the time of low power consumption, the battery pack in the household energy storage system can be self charged to be used in case of standby power peak or power failure. In addition to being used as an emergency power supply, the household energy storage system can also balance the power load, thus saving the household electricity expenditure. Stackable design to meet the power demand of different customers. Easy to use and low installation cost.