6 Electrical Connection
SMA Solar Technology AG
Operating manual
39
SI44M-80H-13-BE-en-15
WARNING
Danger to life due to fire
In case of a short circuit, the short-circuit current driven by the generator flows over the unprotected cable between
the Sunny Island and the AC distribution board. Short-circuit currents can cause fires.
• If the fuse on the generator has a higher operating current than the fuse in the AC distribution board, size the
cable between the generator and AC distribution board in accordance with the operating current of the fuse
on the generator.
1. On the Sunny Island, connect the cable to the
AC1 Loads/SunnyBoys
. To do this, connect the line conductor to
AC1 Loads/SunnyBoys L
and the neutral conductor to
2. Thread the grounding conductor through a ferrite included in the scope of delivery and connect to
AC1 Loads/
SunnyBoys PE
3. If the power cable conductor cross-section is less than 10 mm², thread an additional grounding conductor through
the provided ferrite and connect it to the
AC1 Loads/SunnyBoys PE
terminal (see Section 6.6.3, page 59).
6.5.5
Connection of Multicluster-Box 12 (MC-Box-12.3-20)
6.5.5.1
Connecting the AC Power Cable of the Multicluster-Box 12
WARNING
Danger to life due to fire
In case of a short circuit, the short-circuit current driven by the generator flows over the unprotected cable between
the Sunny Island and the AC distribution board. Short-circuit currents can cause fires.
• If the fuse on the generator has a higher operating current than the fuse in the AC distribution board, size the
cable between the generator and AC distribution board in accordance with the operating current of the fuse
on the generator.
Requirement:
☐ The inverters to be connected must be Sunny Island 6.0H / 8.0H inverters.
Procedure:
1. Connect the AC power cable to the
AC2 Gen/Grid
on all Sunny Island. When doing so, connect the line
conductor to
AC2 Gen/Grid L
and the neutral conductor to
2. Thread the grounding conductor through a ferrite included in the scope of delivery and connect to
AC2 Gen/
Grid PE
6.5.5.2
Connecting the Control Cable of the Multicluster-Box 12
Requirement:
☐ The inverters to be connected must be Sunny Island 6.0H / 8.0H inverters.
Procedure:
1. On the master of the main cluster, connect the
X106 1
line conductor and
X106 2
neutral conductor (for the
control voltage) to terminal
AC1 Loads/SunnyBoys
