Power wall is a stationary home energy storage product equipped with rechargeable lithium-ion battery. Generally the power wall stores electricity for solar self-consumption, time of use load shifting, and backup power, which is able to charge the whole family, including TV, air conditioner, lights, etc and mainly intended for domestic usage. It usually comes in different shapes sizes, colors, nominal capacity and so on, with the aim to provide homeowners with a reliable source of clean energy and help reduce their reliance on the grid.