SMA SI 5048 - Page 199

SMA Solar Technology AG Troubleshooting
Technical Description SI5048-TEN093630 199
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35)).
• The loads connected to the stand-alone grid are too heavy. 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.
What do I do when a battery cell can no longer be used?
• Remove the unusable cell from your battery bank. Start the Sunny Island and change the battery
voltage in the QCG under "New Battery".
What can I do when the QCG does not run?
• Switch off the Sunny Island (see section 9.3”Switch off” (page62)) and restart it
(see section 9.1”Activation” (page60)).
What happens when "MMC operation failed" appears on the display?
• You wanted to perform an action using the SD card, but it failed (see section 10.9”Display of
Warnings and Failures” (page79)). Check the card (on your PC/laptop) and use a new SD
card, if necessary.
Why does my Sunny Island stay on even though I switched the DC circuit breaker
to Off?
• Your Sunny Island may be powered by the AC side. Switch off all AC loads and disconnect
them from the Sunny Island (see section 9.4”Disconnect the device from voltage sources”
(page62)).
Why is my battery discharging even though the generator is running?
• The power produced by the generator does not reach the Sunny Island. Check the voltage and
frequency values. The fuses on the generator may have been triggered.
• The consumer power exceeds the generator power "234.03 GnCurNom".
– Check error messages Find the cause.
Why is the deactivation defined by the SOC in case of a full or equalization
charge and generator start in the second time zone?
• Equalization charge has a higher priority than silent time.
Why is the SOC not at 100 % even after full charging has been completed?
• Set a longer absorption period.
How is it possible to ensure that the maximum battery charging current is
correctly calculated after a reinstallation of the battery current sensor?
• Re-calibrate the battery current sensor using the "225.04 BatCurAutoCal" parameter with the
setting "Start".