SMA Solar Technology AG
Electrical Connection
Technical Description
SI5048-TEN093630
35
6.3 AC Connection
6.3.1 Cable protection
Use a sub-distribution unit in order to connect the Sunny Island to the stand-alone grid and any other
external which may be available.
Provide the sub-distribution unit with appropriate line circuit breakers, and observe all local norms and
regulations.
The Sunny Island is not equipped with an all-pole isolator. The neutral conductor (N conductor) is
looped through the device and the N connection terminals of AC1 and AC2 are connected inside the
Sunny Island.
6.3.2 AC1 (Loads/Sunny Boys)
The stand-alone grid sub-distribution (e.g., loads, PV inverter, wind turbine inverter) is connected to the
AC1 output of the Sunny Island.
If you want to secure individual load circuits separately, you must use circuit breakers of maximum
16 A and with a type B trigger characteristic. If there is a short circuit the Sunny Island can trigger this
circuit breaker. If larger fuses, or fuses that blow more slowly are used, the Sunny Island cannot trip
these. In these cases be sure to install a residual current device (RCD) in order to avoid dangerous
body currents.
NOTICE!
Destruction of the Sunny Island due to overvoltages 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 Island with the same cross-sections and cable
lengths. Connect all AC inputs in parallel.
Connecting in a three-phase parallel system
Always install the master at phase L1, slave 1 at L2 and slave 2 at L3. This installation
results in a right-hand rotary field.
Failure of one phase within a three-phase system
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.
Summary of Contents for SI 5048
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