Home energy stroage system and method for allocating electronic energy thereof

According to the present invention, a home energy storage system allowing only life essential load for life maintenance to be operated to be able to perform actual operating efficiency and optimal operation in case of need when power failure or abnormality of a power system is detected comprises: an energy storage unit including a battery module storing electric energy; a power conversion unit including a power module for converting the electric energy to match a rated voltage of life essential load; a smart distribution unit supplying the converted electric energy for the life essential load and blocking the electric energy being supplied; and a control unit detecting power failure or abnormality of a power system and changing electric energy supply to the life essential load to be transmitted through the energy storage unit through control of the smart distribution unit when the power failure or the abnormality of the power system is detected.