SMA Home Storage HS-BM-3.28-10 - Connecting the DC Cables

7 Electrical Connection
SMA Solar Technology AG
Operating ManualHS-BM-3.28-10-BE-en-1042
7. Attach the cable support sleeve between the swivel nut and
adapter and secure the cable. To do this, firmly tighten the
adapter and the swivel nut.
8. Repeat the procedure for connection on the battery side of the
communication cable. Make the connection on the top
communication cable of the top battery.
9. Make sure that the RJ45 termination plug is plugged in on the bottom battery data cable of the last battery
module.
Also see:
• Overview of the Connection Area⇒page35
• Battery data cable requirements⇒page37
• Wiring overview with hybrid inverter⇒page36
• Connection overview of the battery communication with the inverter⇒page40
7.9 Connecting the DC Cables
To connect the DC cables, always connect the 2 nearest battery modules to each other. All battery modules are
connected in series.
Additionally required material (not included in the scope of delivery):
☐ 2 DC cables for connecting to the inverter
☐ At least 1 longer DC cable is required to connect the battery modules to each other if they are not mounted
directly above each other. This is unavoidable for:
– 4 or 5 battery modules
– Back-to-back
Prerequisite:
☐ The battery modules must be mounted.
☐ All grounding cables must be connected.
Procedure:
1. Ensure that the battery modules and the inverter are disconnected from all voltage sources.
2. To make a longer cable, use the provided MC4 connectors.