This is the 40kwh battery stackable lithium energy storage. 40kwh battery is the low voltage storage battery with 4 battery packs, each battery pack is 10kwh, and the top layer is the 10kw solar inverter, all in one, plug and play, you can use the 40kwh battery system to supply power for your house appliances, it is also suitable for small commercial applications, such as bring power for coffee shops lightings, monitoring electrical system, offices, canteens, shopping malls, and so on.