6 Electrical Connection SMA Solar Technology America LLC
42 SI4548-6048-US-BE-en-21 Operating Manual
Connecting the Grounding Conductor
1. Install a conduit with a diameter of 1
1
/
2
in. (38.1 mm) at the opening in the center of the
Sunny Island. Attach the conduit in the inside of the Sunny Island using the appropriate nut.
2. Pull the cable with the grounding conductor through the supply line from the inside of the
distribution board into the enclosure of the Sunny Island.
3. Strip off the insulation of the grounding conductor.
4. Plug the grounding conductor into the DC terminal for grounding and tighten the fastening screw
with a torque of 21 ft-lb (28 Nm). Use an Allen key (8 mm).
☑ The grounding conductor is connected.
Calculating the cross-section of a grounding conductor
SMA cannot state generally valid values for the cross-section of the grounding conductor required for
the external grounding of the battery. The conductor dimensions depend on the type and size of the
battery connected, the external fuse (DC side) and the material used for the grounding conductor.
Calculating the grounding conductor cross-section according to applicable standards
Exact calculation of the grounding conductor cross-section must take account of the regionally
applicable standards and directives (e.g National Electric Code
®
Article 250.122).
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