Cable Protection; Connecting The Sunny Island On The Dc Side - SMA SUNNY ISLAND 4548-US Operating Manual

6 Electrical Connection

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.
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 cable in such way 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.

6.2.4 Connecting the Sunny Island on the DC Side

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.
Risk of burns due to hot battery components
Improper battery connection may result in excessively high transition resistances. Excessive transition
resistances give rise to localized heat build-up.
• Ensure that all pole connectors are connected with the connecting torque specified by the
battery manufacturer.
• Ensure that all DC cables are connected with the connecting torque specified by the battery
manufacturer.
Requirements
• 1 conduit with a diameter of 1
Sunny Island (see Section 6.1 "Grounding", page 41).
• The conduit is attached inside the Sunny Island with a suitable nut.
46 SI4548-6048-US-BE-en-21
1
/ in. (38.1 mm) is installed at the opening in the middle of the
2
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Operating Manual