CAN communication is a daisy chain communication, not a star communication !
Meaning all batteries communication are in series and only the master battery is connected to Cerbo BMS-CAN port.
Something like in the picture below, external device being Cerbo.
It’s a picture with a different type of battery, but the idea it’s the same for all manufacturers.
LE:
Additionally, a connection schematic from a Basen Green battery manual.
