SMA Sunny Island 4548-US User Manual (English)

Other manuals for SMA Sunny Island 4548-US

Operating Manual244 pages

Technical Description240 pages

Questions and Answers:

E
Eric Thomas PhDAug 21, 2025
Why is my SMA Inverter Sunny Island not connecting to the running generator?
- M
  Melissa KirbyAug 21, 2025
  If your SMA Inverter Sunny Island isn't connecting to the running generator, several factors could be at play. First, check the generator's fuse. If that's fine, see if the power fed back into the generator during the permissible time has been exceeded, indicated by a "!" display, which blocks generator connection for a set time; in this case, set the "540.02 GnAck" parameter to Ackn. If the generator control relay (GnReq) is open, check if the generator was started manually and switch to autostart if needed. Lastly, if a GenMan is in use, verify the return signal (DigIn), as it allows only manual generator starts.
D
Denise PerezAug 23, 2025
What to do if SMA Sunny Island 4548-US battery is discharging even though the generator is running?
- C
  Cassandra MooreAug 23, 2025
  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.
T
tcurryAug 25, 2025
Why does SMA Sunny Island 4548-US Inverter Sunny Island connect to the generator only for a short time?
- C
  Caroline SchroederAug 25, 2025
  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.
D
Daniel AllenAug 27, 2025
Why is the display of my SMA Sunny Island 4548-US Sunny Island dark?
- M
  Monica VelazquezAug 27, 2025
  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.
K
Kelsey PayneAug 27, 2025
What to do if VAC-Low error occurs when starting SMA Sunny Island 4548-US Inverter Sunny Island?
- R
  Ryan GuerreroAug 27, 2025
  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.
B
Brandon BondAug 29, 2025
Why does SMA Sunny Island 4548-US Sunny Island stay on after DC circuit breaker is off?
- L
  Laura McphersonAug 29, 2025
  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.
J
janet23Aug 31, 2025
Why is stand-alone grid frequency not at 60 Hz on SMA Sunny Island 4548-US Inverter?
- V
  Vicki PerezAug 31, 2025
  If the stand-alone grid frequency is not at 60 Hz when using your SMA Inverter, the Sunny Boy inverter might be controlled via the frequency. Another possibility is that the automatic frequency synchronization function of the Sunny Island 4548-US/6048-US is activated. Also, power fluctuations can cause frequency deviations.
M
millerkurtSep 1, 2025
Why do SMA Sunny Island 4548-US extension clusters remain in standby?
- B
  brenda90Sep 1, 2025
  If extension clusters remain in standby while the main cluster operates properly on your SMA Inverter, check whether the data cable between the master devices is connected. The main master cannot forward the "Start" command to the extension master if the connection is missing.
J
Jennifer HuangSep 3, 2025
Why is my SMA Sunny Island 4548-US multicluster system not supplying full power?
- K
  kayla51Sep 3, 2025
  If your SMA Inverter multicluster system isn't supplying full power, it's possible that a slave in one of the extension clusters has failed. The system will continue to operate, but with reduced output.
R
Ronald CallahanSep 4, 2025
What to do if a battery cell can no longer be used with SMA Sunny Island 4548-US?
- D
  Diana HicksSep 4, 2025
  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".

SMA Sunny Island 4548-US Specifications

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