SMA Solar Technology AG 6 Electrical Connection
Installation Manual SI80H-60H-OffGrid-IA-en-11 45
6.13 Installing Protective Devices for AC Sources in the
Stand-Alone Grid
If you install AC sources in the stand-alone grid, you must install the following protective devices in the
AC sub-distribution:
• Protect the connection cable of every AC source (e.g. PV inverter) with a miniature circuit-
breaker.
• Install the residual-current device type A in accordance with the applicable local standards and
directives.
• If the applicable local standards and directives require a fuse-switch-disconnector, install a fuse-
switch-disconnector in the AC sub-distribution.
• If a fuse-switch-disconnector is installed, dimension the fuse link based on the feed-in current of
the AC sources.
• For three-phase off-grid systems, distribute the power of the AC sources as evenly as possible
across the three line conductors.
6.14 Installing Protective Devices for a Generator
If you install a generator, you must install the following protective devices:
• If the applicable local standards and directives require a fuse-switch-disconnector, install a fuse-
switch-disconnector between the generator and off-grid inverter.
• If a fuse-switch-disconnector is installed, dimension the fuse links. Observe the rated current of
all off-grid inverters, the type of installation and the conductor cross-section of the connection
cable.
• If the output of the generator is not protected, connect the generator in such a manner that it is
protected against earth faults and short circuits.
• For a three-phase stand-alone grid, protect the generator by means of phase monitoring or a
motor-protection circuit-breaker.
6.15 Connecting the Communication
6.15.1 Removing the Cable Feed-Through Plate
When connecting RJ45 data cables for communication, you must remove the cable feed-through
plate.
1. Remove the cable feed-through plate from the enclosure by pushing it towards the outside.
2. Keep the cable feed-through plate in a safe place.
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