The Chinese manufacturer BYD serves the commercial sector with its commercial packages and thus offers a product "off the shelf" for the first time. The BYD commercial storage system is used to optimise the self-consumption, to cap peak loads and to expand the connected load. BYD uses its experience gained in cell production from the residential sector and passes this on directly to its customers. Thanks to AC coupling, this commercial system is scalable and can be combined with any PV system.