The system accessories for storage and inverters: Felicity high voltage BMS control modules, FLH48100UCG2 for clusters up to 81.92kWh and FLH96050SCG2-H in IP65 with heating built in, the SolaX TBMS-MCS0800E BMS with base for TP-HS50E batteries, and the Deye GB-W-PDU-2 PDU control box for 200-1000V and 230A.
On high-voltage storage the master BMS is not an accessory but the heart of the system: it gathers data from every slave module, works out state of charge and current limits and talks to the inverter. A cluster does not run without its compatible control module.
The PDU handles isolation, pre-charge and protection of the DC bus.