SMA Home Storage HS-BM-3.28-10 - Requirements for the electrical connection

7 Electrical Connection
SMA Solar Technology AG
Operating ManualHS-BM-3.28-10-BE-en-1036
7.2 Wiring overview with hybrid inverter
ROUTER
UTILITY
GRID
Distribution board
with protective
devices
LOAD
DC+ cable
DC– cable
AC
Speedwire/Ethernet
CAN
Max. of 5
batteries
Figure 16: SMA Home Storage with 1 hybrid inverter (example)
7.3 Requirements for the electrical connection
7.3.1 Grounding cable requirements
An additional grounding of the battery modules is required to protect from touch current in case the grounding
conductor fails at the terminal of the DC cable.
☐ The supplied grounding cables for the connection between the battery modules must be used.
☐ If the length of the supplied grounding cables is not sufficient, longer grounding cables must be used with a cross-
section of 6mm² and the supplied terminal lugs.
☐ To connect the additional grounding via an external grounding point, a ring terminal lug must be used.
7.3.2 DC cable requirements
☐ If a battery connecting cable is part of the inverter scope of delivery, this battery connecting cable and a provided
MC4 connector are to be used.
☐ If a battery connecting cable is not part of the inverter scope of delivery or if a longer cable is needed, the
provided MC4 connectors and a battery connecting cable with a cross-section of 6mm² must be used.
☐ The cables must be made of copper.