Electrical Connection SMA Solar Technology AG
36 SI5048-TB-TEN110340 Technical Description
6.3 AC Connection
6.3.1 Cable Protection
Connect the Sunny Island to the stand-alone grid and to any other existing external source using a
distribution sub-panel.
Provide the distribution sub-panel with appropriate line circuit breakers, and observe all regional
standards and guidelines.
The Sunny Island is not equipped with an all-pole isolator. The neutral conductor (N conductor) is
looped through the device and the N terminals of AC1 and AC2 are connected inside the Sunny
Island.
6.3.2 AC1 (Loads/Sunny Boys)
The stand-alone grid distribution sub-panel (e.g. loads, PV inverters, wind power inverters) is
connected to the AC1 output of the Sunny Island.
If you wish to provide separate protection for an individual load circuit, then use a maximum 16 A
circuit breaker with B-type tripping characteristics. In the event of a short circuit, the Sunny Island can
trip this circuit breaker. If larger fuses are used, or fuses that blow more slowly, the Sunny Island
cannot trip them. In these cases, be sure to install a residual current device (RCD) in order to avoid
dangerous touch currents.
NOTICE!
Destruction of the Sunny Island due to overcurrent at the AC input.
• Do not exceed the maximum input current of 56 A.
Connection in a single-phase parallel system
Connect all single-phase parallel Sunny Islands with the same cross-sections and cable
lengths. Connect all AC inputs in parallel.
Connection in a Three-phase Parallel System
Always install the master on phase L1, slave 1 on L2 and slave 2 on L3. This installation
has a right-hand rotary field.
Failure of a Phase within a Three-phase System
If in a 3-phase system a phase fails on the master, the cluster stops. If a phase fails on a
slave, the cluster can either continue to operate or switch off. You may require a phase
monitor or a motor circuit breaker to protect your loads.
Distributing loads and AC feed-ins in multiple-phase systems
Distribute the power of the feeding and loads as well as the AC feed-in generators as
equally as possible on all system phases.
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