SMA Off-Grid Systems - Manual (Page 28)

5 Single-Cluster System SMA Solar Technology AG
28 Off-Grid-IS-en-30 Installation - Quick Reference Guide
5.3.2 Connecting the Slaves
Figure 11: Connecting the slaves in a single-cluster system
Position Designation Description/information
A AC power cable of the
stand-alone grid
Sunny Island: connection to AC1 Loads/SunnyBoys terminals L, N, and PE
Stand-alone grid: Connect slave 1 to line conductor L2, and connect slave 2
to line conductor L3.
For a single-phase system, the cable length and the conductor cross-section
must be identical on each Sunny Island.
Conductor cross-section: maximum 16 mm²
B AC power cable of the
generator
Sunny Island: connection of generator to AC2 Gen/Grid terminals L, N,
and PE
Generator: connect slave 1 to line conductor L2, connect slave 2 to line
conductor L3.
Conductor cross-section: maximum 16 mm²
For a single-phase system, the cable length and the conductor cross-section
must be identical on each Sunny Island.
The Sunny Island must be connected via a grounding conductor on the
terminal AC1 or AC2 to the ground potential. The conductor cross-section of
the grounding conductor must be 10 mm² or larger. If the conductor
cross-section is smaller, an additional grounding conductor on the enclosure
with the conductor cross-section of the AC power cable must connect the
Sunny Island with the ground potential.