The BYD BCU Battery Control Unit is compatible with all BYD LVS batteries and is supplied complete with base plate, cover, BCU and wall bracket. The BYD-LVS-Base-Cover is an essential accessory to the BYD low voltage battery system. A minimum of one module is required per battery tower, with a maximum of six modules. A maximum of 16 x 4 battery towers can be combined in a storage system.