The Deye CB002 is the high-voltage cluster control box for the Deye BOS-A 7.68kWh battery (DEYE-HV-BAT-BOS-A7680). Every BOS-A cluster needs exactly one.
It mounts at the top of the rack and manages the cluster: the master BMS, the circuit breaker and the DC and communication links to the inverter. Its two PCS DC output pairs are both used when cluster current exceeds 100A.