PowerOak designs and manufactures 0.4~32KWh Li-ion energy storage systems. our ESS equipment has integrated most of components inside a box (all-in-one) such as inverter, solar controller and lithium battery pack, and they were controlled by our own software working coordinately. This product can help to store electric energy from the Sun as millions of solar home systems have been keeping increasing installed at residential rooftops for every year, so that you can easily get energy in nights even when there's power failure.