SMA Solar Technology AG Connecting External Sources
Technical Description SI2012_2224-TEN082311 147
13.2.1 Conditions
In order to operate on the grid, very strict limits (for voltage and frequency) must generally be
maintained. This strict limits are not sensible for generator operation. The limits are therefore set
separately for grid operation and the generator limits are not used.
13.2.2 Stand-Alone Grid Operation
The main power grid and stand-alone grid are disconnected and the Sunny Island powers the stand-
alone grid. The system waiting for the grid to reconnect is an indication of this state.
As long as the battery has a sufficient charge level, the loads are powered. In stand-alone
operation, the AC feed-in generators (e.g. Sunny Boys) perform a charge operation, if required.
13.2.3 Grid Reconnection
In stand-alone operation, the Sunny Island constantly checks whether the grid has been reconnected
(see above). If the voltage and frequency of the main power grid are within the permissible range
of the "232.01 GdVtgMin" and "232.02 GdVtgMax" parameters for the time set it
"232.07 GdVldTm"; and if the frequency is within the permissible range of the "232.05 GdFrqMin"
and "232.06 GdFrqMax" parameters (see also chapter 13.2.1 "Conditions" (Page 147)), the
stand-alone grid is synchronized with the main power grid and then connected.
Information
The default settings for limits during grid operation comply with the following standards:
• For 230V_50Hz: DIN VDE 0126-1-1 (not entirely)
NOTICE!
The Sunny Island does not meet the VDE 0126-1-1 directive required in Germany and,
for legal reasons, it must therefore be MSD-certified (e.g. by UfE GmbH) when operated
while connected to the public grid.
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