SMA Solar Technology AG Additional Functions
Technical Description SI5048-TB-TEN110340 95
12.4 Overload and Short-Circuit Behavior
The Sunny Island can be temporarily operated under overload conditions. It can also supply short-
circuit currents.
In case of overload, the Sunny Island supplies an output of 6 500 W for 30 minutes and can supply
7 200 W for 5 minutes. The device can even supply 8 400 W of output power for one minute.
In the event of a short circuit, the Sunny Island provides a maximum current of 100 A (for 100 ms).
This is sufficient to trip commercial 16 A B-type circuit breakers.
12.5 Device Faults and Autostart
If a critical fault occurs, the Sunny Island automatically shuts down and displays the reason on the
display. If the autostart function is activated ("250.01 AutoStr" parameter), the Sunny Island can
confirm the failure automatically and restart on its own. If the failure persists, the Sunny Island cannot
be started.
12.6 Automatic Frequency Control (AFC)
Clocks that depend on the stability of the grid frequency for their accuracy become increasingly
inaccurate when there are constant frequency deviations. Frequency fluctuations, i.e., deviations from
the nominal frequency occur, for example, in stand-alone grid systems that operate with a diesel
generator.
The "Automatic Frequency Control (AFC)" function of the Sunny Island allows the use of grid-coupled
clocks in these types of stand-alone grid systems. This function is activated using the
"250.11 AfraEna" parameter.
The time deviation is compensated on average.
Automatic start meter
If the autostart meter has counted down to 0, the Sunny Island waits for 10 minutes before
attempting to restart automatically.
Displaying messages
Messages can be displayed at any time while the device is in operation and they have
priority over the "Home Screen" display.
Quartz-controlled clock in the Sunny Island
The internal clock in the Sunny Island is quartz-controlled and thus operates correctly
(within the tolerance limits). The adjustment refers to externally connected clocks that
depend on the grid frequency.
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