Huawei Backup Box-B0 Quick Manual page 3

Supported Grid Types
The Backup Box supports the following grid types: TN-S, TN-C-S and TT. When the inverter is in
three-phase, three-wire mode, the Backup Box does not support off-grid operation.
Appearance
(1) Front panel
(3) Hanging kit
(5) Grid AC port (GRID)
(7) COM port (COM)
(9) Ground point
(2) Lock
(4) Off-grid load port (BACKUP LOAD)
(6) Inverter AC port (INVERTER AC)
(8) Ventilation valve
2