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SolarEdge · PV inverters · SolarEdge SE3K–SE10K (three-phase inverter with power optimizers, SetApp)

Error 18x37Line voltage is high

Name in the manufacturer's documentation (fault list): Line voltage is high[1]

In plain words (editorial)

The grid (line) voltage is too high for the inverter's country settings. The manual says to verify that the inverter is set to the correct country and to consult the grid operator; grid protection values may only be changed if permitted by local authorities.

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. [1] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 24 official manufacturer document quote verified 18x37 Line voltage is high
  2. [2] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 24 official manufacturer document quote verified Verify that the inverter is set to the correct country
  3. [3] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 24 official manufacturer document quote verified Consult the grid operator
  4. [4] SolarEdge Inverters Error Codes and Troubleshooting – User Guide (Version 1.2, 2026-09) (se-inverter-installation-guide-error-codes (v1.2)) , p. 24 official manufacturer document quote verified If permitted by local authorities, change the grid protection values