6 Electrical Connection
SMA America, LLC
40
SI4548_6048-US-TB_en-13
Technical description
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 cabling through the supply line from the inside of the distribution board into the
enclosure of the Sunny Island.
3. Strip the insulation of the grounding conductor.
4. Plug the grounding conductor into the DC terminal block for grounding and tighten the fastening
screw to a torque of 21 ft-lbs. (28 Nm). Use an Allen key of
5
⁄
16
in. (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 cable dimensions depend on the type and size of the
battery connected, the external fuse (DC side) and the material used in the grounding conductor.
Calculating the required 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).
Summary of Contents for Sunny Island 4548-US
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