SMA Solar Technology AG 4 Product Description
Installation Manual SI80H-60H-OffGrid-IA-en-11 19
4 Product Description
4.1 Sunny Island
The Sunny Island is a bidirectional off-grid inverter and forms a stand-alone grid.
Figure5: Design of the Sunny Island
The Sunny Island supplies AC loads in the stand-alone grid from a battery or charges the battery with
the energy provided by sources on the AC side. AC sources in the stand-alone grid (e.g. PV inverters)
supply loads and are used by the off-grid inverter to recharge the battery. In order to increase the
availability of the stand-alone grid and reduce the battery capacity, the Sunny Island can use and
control external energy sources (e.g. a generator) as an energy reserve.
The Sunny Island supplies the loads with active power and reactive power. The loads may temporarily
overload the Sunny Island. If there is a short circuit in the stand-alone grid, the Sunny Island also briefly
feeds short-circuit currents into the stand-alone grid. As a result, the Sunny Island may trip the miniature
circuit-breaker. Miniature circuit-breakers only disconnect electric circuits that are affected by the fault.
The off-grid system must be a TN or TT system. The Sunny Island does not support IT systems.
Position Description
A Ventilation grid
BType label
CControl panel
DEnclosure lid
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