GoodWe · PV inverters · GoodWe ET G2 6–15 kW (three-phase hybrid inverter)
F03Grid Undervoltage Protection
Name in the manufacturer's documentation (user manual): Grid Undervoltage Protection
[1]
In plain words (editorial)
The grid voltage is below the permissible range, or the low voltage lasted longer than the ride-through setting. If it happens only occasionally it is a short-term grid issue: the inverter resumes normal operation on its own once the grid is normal again, without manual intervention.
When to call a service technician: If it happens frequently, contact your installer – the grid values may need to be checked with the local power operator; protection settings are changed only with the operator's approval.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
- The grid voltage is below the permissible range, or the low-voltage Duration exceeds the Low Voltage ride-through setpoint.[2]
Steps given by the manufacturer (source text)
- If it occurs occasionally, it may be caused by a short-term grid abnormality. The inverter will resume normal operation after detecting that the grid is normal, and no manual intervention is required.[3]
- If it occurs frequently, check whether the grid voltage is within the permissible range. If not, contact the local electric power operator. If it is, the Grid Undervoltage Protection setpoint also needs to be modified after obtaining the consent of the local electric power operator.[4]
- If it cannot be restored for a long time, check whether the AC-side circuit breaker and output cables are connected properly.[5]
⚠ 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. 190 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. 190 official manufacturer document quote verified
The grid voltage is below the permissible range, or the low-voltage Duration exceeds the Low Voltage ride-through setpoint
- [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. 190 official manufacturer document quote verified
If it occurs occasionally, it may be caused by a short-term grid abnormality. The inverter will resume normal operation after detecting that the grid is normal, 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. 190 official manufacturer document quote verified
If it occurs frequently, check whether the grid voltage is within the permissible range. If not, contact the local electric power operator. If it is, the Grid Undervoltage Protection setpoint also needs to be modified af…
- [5] 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. 190 official manufacturer document quote verified
If it cannot be restored for a long time, check whether the AC-side circuit breaker and output cables are connected properly