SolarEdge · PV inverters · SolarEdge SE3K–SE10K (three-phase inverter with power optimizers, SetApp)
Error 18x1AAC voltage surge
Name in the manufacturer's documentation (fault list): AC voltage surge
[1]
In plain words (editorial)
An AC voltage surge was detected. The manual says to check the AC connection, verify the country setting, ask the grid operator whether a large surge source or irregular load exists near the site, and check that the AC output wire size matches the distance to the grid connection point.
When to call a service technician: If it keeps recurring, contact your installer.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Steps given by the manufacturer (source text)
- Check the AC connection to inverter[2]
- Verify that the inverter is set to the correct country[3]
- Check with the grid operator if a large surge source or irregular load exists near the site[4]
- Erify that the output wire size matches the distance between the inverter and the location of the grid connection[5]
- Use a larger gauge wire for the AC output[6]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →
Sources
Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.
- [1] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 18 official manufacturer document quote verified
18x1A AC voltage surge
- [2] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 18 official manufacturer document quote verified
Check the AC connection to inverter
- [3] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 18 official manufacturer document quote verified
Verify that the inverter is set to the correct country
- [4] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 18 official manufacturer document quote verified
Check with the grid operator if a large surge source or irregular load exists near the site
- [5] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 18 official manufacturer document quote verified
erify that the output wire size matches the distance between the inverter and the location of the grid connection
- [6] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 18 official manufacturer document quote verified
Use a larger gauge wire for the AC output