GoodWe · PV inverters · GoodWe ET G2 6–15 kW (three-phase hybrid inverter)
F15GFCI Gradual Change Protection
Name in the manufacturer's documentation (user manual): GFCI Gradual Change Protection
[1]
In plain words (editorial)
The input-to-ground insulation resistance dropped gradually during operation (GFCI gradual change protection). If it happens only occasionally, the external line was briefly abnormal and normal operation resumes without manual intervention.
When to call a service technician: If it happens frequently or does not recover for a long time, have your installer check the PV string-to-ground impedance.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
- During inverter operation, the input-to-ground insulation resistance becomes low.[2]
Steps given by the manufacturer (source text)
- If it occurs occasionally, it may be caused by a temporary abnormality in the external line. After the fault is cleared, normal operation will resume, and no manual intervention is required.[3]
- If it occurs frequently or cannot be recovered for a long time, check whether the PV string-to-ground impedance is too low.[4]
⚠ 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] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 195 official manufacturer document quote verified
- [2] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 195 official manufacturer document quote verified
During inverter operation, the input- to-ground insulation resistance becomes low
- [3] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 195 official manufacturer document quote verified
If it occurs occasionally, it may be caused by a temporary abnormality in the external line. After the fault is cleared, normal operation will resume, and no manual intervention is required
- [4] GoodWe Residential Smart Inverter Solutions – ET G2 6-15K (+ LX F / LX D) – User Manual V2.2 (2026-09-30) (V2.2-2026-09-30) , p. 195 official manufacturer document quote verified
If it occurs frequently or cannot be recovered for a long time, check whether the PV string-to-ground impedance is too low