SolarEdge · PV inverters · SolarEdge SE3K–SE10K (three-phase inverter with power optimizers, SetApp)
Error 18x54The frequency measured on L3 is higher than the thresholds
Name in the manufacturer's documentation (fault list): The frequency measured on L3 is higher than the thresholds
[1]
In plain words (editorial)
The grid frequency measured on phase L3 is higher than the thresholds. The manual says to reselect the country code and verify the AC frequency and voltages on site.
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.
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. 27 official manufacturer document quote verified
18x54 The frequency measured on L3 is
- [2] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 27 official manufacturer document quote verified
Reselect country code
- [3] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 27 official manufacturer document quote verified
Verify AC frequency and voltages on site