Sunny Island 4500
Installation & Operating Instructions
BWRI45-13-EE0304
- 18 -
SMA Regelsysteme GmbH
2.1.2 Grid-Tied Operation (RUN_I)
In grid-tied operation the Sunny Island follows the voltage and frequency defined by
an external power source. This can be an independent synchronous generator or the
public utility. In this case, the Sunny Island does not control the grid voltage and grid
frequency but controls the current it draws from the grid to charge the battery in a
defined and most suitable manner.
Sunny Island
Control of battery
current and
battery voltage
Control of
frequency
and voltage
Sunny Boy
PV Modules
Consumers
Generator as
grid forming element
SG
230 V 50 Hz/60 Hz
Fig. 2.2:
Sunny Island with external grid-former