SMA Solar Technology AG Connecting External Sources
Technical Description SI5048-TB-TEN110340 123
14.2.1 Voltage and Frequency Limits
In order to operate on the grid, very strict limits (for voltage and frequency) must generally be
maintained. These strict limits are not sensible for generator operation. The limits are therefore set
separately for grid operation and the generator limits are not used.
14.2.2 Starting the Sunny Island
The Sunny Island always starts in stand-alone grid operation. Once the device is operating, it checks
for the presence and validity (voltage and frequency) of the external grid.
14.2.3 Stand-Alone Grid Operation
The power distribution grid and stand-alone grid system are disconnected and the Sunny Island
powers the stand-alone grid system. This state is characterized by the system waiting for the grid to
reconnect.
As long as the battery has a sufficient state of charge, the loads are powered. In stand-alone grid
operation, the AC feed-in generators (e.g. Sunny Boy) perform a charge operation, if required.
Default settings
The default settings for limits during grid operation comply with the following standards:
• For 230V_50Hz: DIN VDE 0126-1-1 (not entirely)
• For 220V_60Hz: UL1741
NOTICE!
For legal reasons, when operated while connected to the power distribution
grid, the Sunny Island must be equipped with a certified automatic disconnection
device.
The Sunny Island does not comply with the VDE 0126-1-1 directive requested in Germany.
Observe the following for legal reasons:
• When operated while connected to the power distribution grid, the Sunny Island must
be equipped with a certified automatic disconnection device.
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