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Bryan DavisSep 9, 2025
What to do if QCG does not run on SMA Sunny Island 4548-US?
- CCasey Barber DVMSep 9, 2025
If the QCG does not run on your SMA Inverter, switch off the Sunny Island and then restart it.
What to do if QCG does not run on SMA Sunny Island 4548-US?
If the QCG does not run on your SMA Inverter, switch off the Sunny Island and then restart it.
What to do if SMA Sunny Island 4548-US battery is discharging even though the generator is running?
If your SMA Inverter's battery is discharging even when the generator is running, examine the voltage and frequency values and check the generator's fuses for any trips. Additionally, it's possible that the load power is exceeding the generator power. In this case, check for any error messages to pinpoint the cause.
Why does SMA Sunny Island 4548-US Inverter Sunny Island connect to the generator only for a short time?
If your SMA Inverter Sunny Island connects to the running generator only briefly, the limits set for the generator's maximum permissible AC voltage or minimum permissible frequency might be too strict. Consider adjusting the voltage and/or frequency limiting values, while ensuring they remain within the technical specifications of your generator.
Why is the display of my SMA Sunny Island 4548-US Sunny Island dark?
If the display of your SMA Inverter Sunny Island is dark, first check whether the DC circuit breaker of the Sunny Island is switched to "ON". If it is, the device may have switched off to protect the battery from deep discharge. After self-disconnection, restart the Sunny Island as described in this document. Also, check if the external battery fuse has tripped.
What to do if VAC-Low error occurs when starting SMA Sunny Island 4548-US Inverter Sunny Island?
If a VAC-Low error occurs when starting the SMA Inverter Sunny Island, it could be due to a permanent short-circuit in the stand-alone grid. Check the AC output connections of the stand-alone grid. Alternatively, the loads connected to the stand-alone grid might be too heavy. Try switching off some loads and restarting the Sunny Island.
Why does SMA Sunny Island 4548-US Sunny Island stay on after DC circuit breaker is off?
If your SMA Inverter Sunny Island remains on even after the DC circuit breaker is switched off, it may be receiving power from the AC side. To resolve this, switch off all AC loads and disconnect them from the Sunny Island.
Why is it not possible to set combinations of voltage and frequency limits on SMA Sunny Island 4548-US?
The possible ranges for voltage and frequency of the SMA Inverter allow the combination of special frequencies and voltages that result in transformer saturation.
How to change between wintertime and summertime operation for alpine huts on SMA Inverter?
Save two different parameter sets on the SD card and activate them via the "550.02 ParaLod" parameter.
What does 'MMC operation failed' mean on SMA Sunny Island 4548-US Inverter display?
If "MMC operation failed" appears on the display of your SMA Inverter, inspect the card using your PC or laptop. If necessary, replace it with a new SD card.
What to do if a battery cell can no longer be used with SMA Sunny Island 4548-US?
If a battery cell can no longer be used with your SMA Inverter, remove the unusable cell from your battery storage system. Then, start the Sunny Island and adjust the battery voltage in the QCG under "New Battery".
General| Model | Sunny Island 4548-US |
|---|---|
| Nominal AC Voltage | 120/240 V |
| AC Frequency | 60 Hz |
| Battery Voltage | 48 V |
| Battery Type | Lead-acid or Lithium-ion |
| Efficiency | 96% |
| Operating Temperature | -25°C to +60°C |
| Rated Power | 4.5 kW |
