SMA America, LLC 6 Electrical Connection
Technical description SI4548_6048-US-TB_en-13 43
6.2.3 Cable Protection
The DC circuit breaker in the Sunny Island can interrupt DC currents of up to 10 kA. In addition to the
internal DC circuit breakers, install a separate, external fuse as close as possible to the battery. Install
a fuse link for the fuse suitable for the maximum occurring DC currents.
6.2.4 Connecting the Sunny Island on the DC Side
Requirements
• One conduit with a diameter of 1
1
/
2
in. (38.1 mm) is installed at the opening in the middle of
the Sunny Island (see Section 6.1 "Grounding", page 39).
• The conduit is attached inside the Sunny Island with a suitable nut.
Installing the DC Connection
1. Pull the positive DC cable through the conduit from the distribution board into the enclosure of
the Sunny Island.
2. Pull the negative DC cable through the conduit from the distribution board into the enclosure of
the Sunny Island.
3. Remove the coating.
4. Strip the insulation from the DC cables.
Electric shock resulting from insufficient protection of the DC cables. Death or serious burns.
• Check whether external cable protection is present.
• If no external cable protection is present, observe the following:
– Lay the DC cables so that ground faults and short-circuits cannot occur.
– Install the additional current limiting fuse outside of the Sunny Island. When doing so,
observe all locally applicable standards and directives.
Danger to life due to electric shock
• Connect the external fuse and the battery cable to the battery only after all installation work
has been completed.
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