SMA SUNNY ISLAND 6048-US - Page 220

20 Troubleshooting SMA Solar Technology America LLC
220 SI4548-6048-US-BE-en-21 Operating Manual
Why is the display of the Sunny Island dark and why is nothing shown on the
display?
• Is the DC circuit breaker of the Sunny Island switched to "ON"? In this case, the device has
switched off to protect the battery from deep discharge (see Section13.4 "State of Charge
(SOC) and State of Health (SOH)", page109). After self-disconnection, restart the
Sunny Island as described in this document (see Section9.5 "Recommissioning After Automatic
Shutdown", page77).
• The external battery fuse has tripped.
Why is it not possible to change the parameters?
• Has the installer password been entered correctly? Check whether you are in "Installer Level"
(see Section10.5 "Entering the Installer Password", page88). If necessary, repeat the
calculation and entry of the password.
• You are in the "100-Meters" (measuring data) main menu or in the "300-Diagnosis" (diagnosis)
menu, for example. You can only read the data values shown here.
• Some parameters can only be changed in standby mode or in the QCG, e.g. the parameter
"234.07 GnStrMod" (see Section19.2 "Adjustable Parameters", page167). Stop the
Sunny Island (see Section9.2 "Stopping the Sunny Island (Standby)", page76). Note that this
causes a failure of the stand-alone grid and the loads are no longer supplied.
Why does the Sunny Island connect to the running generator only for a short
time?
• The limits for the maximum permissible AC voltage or the minimum permissible frequency of the
generator are too strict (parameter in the menu "233# Generator Control"). Change the voltage
and/or frequency thresholds while observing the technical data of your generator.
Why does the "VAC-Low" error (output voltage too low) also occur when the
Sunny Island is started?
• A permanent short-circuit exists in the stand-alone grid. Check the AC output connections of the
stand-alone grid (see Section6.3 "AC Connection", page48).
• The consumption of the loads connected to the stand-alone grid is too high. The power/
electrical energy of the Sunny Island is not sufficient to supply the loads. Switch off some of the
loads and restart the Sunny Island.
Why is the frequency of the stand-alone grid not at 60 Hz?
• The Sunny Boy inverter is controlled via the frequency (see Section17.5 "Frequency-Shift Power
Control (FSPC)", page154).
• The automatic frequency synchronization function of the Sunny Island 4548-US / 6048-US is
activated (see Section12.7 "Automatic Frequency Synchronization", page106).
• Power fluctuations cause frequency deviations.