Household storage is usually installed in combination with household photovoltaic systems to provide electrical energy for home users. During the day, the electricity generated by the photovoltaic system is preferentially used by the local load, and the excess energy is stored in the battery, which can be selectively incorporated into the power grid if there is still a surplus of electricity. At night, when the photovoltaic system is unable to generate electricity, the battery discharges to provide electricity for the local load.