Sunny Island Electrical Connection SMA Solar Technology AG
50 SI2012_2224-TEN082311 Technical Description
7.3.3 AC2 (Gen/Grid)
Via the distribution, connect the generator or the public grid using 3 conductors to the Sunny Island's
AC2 connector.
Proceed as follows:
1. Remove the blank seals from the opening
on the underside of the enclosure and to
the right.
2. Introduce the metric-threaded cable
connection M25 (included in the delivery)
into the opening and tighten.
Do not forget the seal!
3. Wire up the AC2 cable as described in
chapter 7.3.2 "AC1 (Loads/Sunny Boys)"
(Page 48).
Connection in a 3-Phase System
• In a 3-phase system, always connect the master to phase L1, slave 1 to phase L2
and slave 2 to phase L3. This circuitry results in a right rotating field.
• If a phase fails within a three-phase grid, the cluster continues to run. In order to
protect your loads, you may require phase monitoring or a motor overload switch.
DANGER!
Death hazard due to residual current if the neutral wire is not grounded.
• Do not install an RCD circuit breaker (or similar) onto the island grid system's grid-
side supply cable.
• Ground the grid-side PEN conductor within the installation (before or at the
separation into N and PE conductors, e.g., the connection from the house's junction
box to the equipotential bonding rail).
Connection in a Single-Phase Parallel System
• In single-phase parallel systems, connect each of the Sunny Islands via the AC2
terminal to the generator or the public grid.
• The cable cross-sections and cable lengths used must be identical.
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