The grid-connected and off-grid scheme of household storage is mainly for the micro-small energy system at the user end, which realizes the energy time shift, dynamic capacity increase, and emergency backup power when connected to the grid through connection with the power grid, and can provide power supply in combination with the photovoltaic power generation system to reduce the dependence on the power grid; In areas sine electricity vel cum sit potentia outage, in stored electrica industria et electrica industria photovoltaic potentia generationem et converti in domum electrica electricity et captiosus industria.