Sunny Island 4500
Installation & Operating Instructions
BWRI45-13-EE0304
- 150 -
SMA Regelsysteme GmbH
11.2 Photovoltaically powered Island Grid with Generator
The energy of the island grid shown in Fig. 11.2 derives from both photovoltaic gen-
erators and a combustion engine. Normally, the voltage and frequency of the island
grid are specified by the Sunny Island. If additional energy is necessary, the Sunny
Island activates the generator functioning as grid-forming element and switches to
grid parallel operation (RUN_I, see Chapter 2.1.2). Thus, the voltage and frequency
of the island grid is then controlled by the generator.
Even in island grids with feeders independent of weather conditions it is
recommended to wire up the consumers in a way to be able to switch
them off by the Sunny Island (via one of its remaining relays). Especially
in case of a failure (generator defective etc.) the battery can thus be pro-
tected against harmful conditions and emergency operation can be made
as efficient as possible.