7 Electrical Connection
SMA Solar Technology AG
Operating ManualHS-BM-3.28-10-BE-en-1038
Prerequisite:
☐ Make sure that the battery modules were correctly mounted.
Procedure:
1. Disconnect all products from voltage sources.
2. Connect battery modules mounted directly above each other via
the supplied grounding cable. To do this, tighten the provided
screw and washer assemblies at the connection points closest to
each other (TX20; torque: 2.5Nm). For batteries not directly
mounted above one another, use a longer grounding cable.
3. Strip off the insulation of a grounding cable suitable for the external grounding and crimp a ring terminal lug to
the cable.
4. Tighten the provided screw and washer assembly at the lower
connection point for the additional grounding (TX20; torque:
2.5Nm).
5. Connect the grounding cable to the external grounding point. The external grounding points of battery and
inverter must have the same potential.
Also see:
• Grounding cable requirements⇒page36
• Overview of the Connection Area⇒page35
• Wiring overview with hybrid inverter⇒page36
7.6 Connecting the battery data cable between the battery modules
To connect the data cables of the battery, always use the COM socket and always connect the 2 closest battery
modules to each other. The unused communication terminal with RJ45 socket of the last battery module must retain the
premounted RJ45 termination plug.
Additionally required material (not included in the scope of delivery):
☐ To connect the battery modules, 1 longer battery data cable with an RJ45 connector is required if the battery
modules are not mounted directly above each other. This is unavoidable for:
– 4 or 5 battery modules
– Back-to-back
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