GoodWe · PV inverters · GoodWe ET 5–10 kW (three-phase hybrid inverter)
Isolation FailureIsolation Failure
Name in the manufacturer's documentation (user manual): Isolation Failure
[1]
In plain words (editorial)
Insulation (isolation) failure – the manual names PV panels not grounded well, a broken DC cable or high humidity.
When to call a service technician: Have your installer check the PV and DC wiring; if it persists, contact GoodWe after-sales.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
Steps given by the manufacturer (source text)
- Use multi-meter to check if the resistance between earth and inverter frame is close to zero; if not, ensure the connection is well[5]
- Check resistance between PV+/BAT+/PV- and earth; if lower than minimum isolation resistance, check the system wiring connection[6]
- Try to restart the inverter and check if the fault still occurs; otherwise contact after-sales[7]
⚠ 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 Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 36 official manufacturer document quote verified
Isolation Failure
- [2] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 36 official manufacturer document quote verified
the PV panels are not grounded well
- [3] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 36 official manufacturer document quote verified
DC cable is broken
- [4] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 36 official manufacturer document quote verified
If the humidity is too high, isolation failure may occur
- [5] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 36 official manufacturer document quote verified
Use multi-meter to check if the resistance between earth & inverter frame is close to zero
- [6] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 36 official manufacturer document quote verified
check the system wiring connection
- [7] GoodWe Hybrid Inverter ET Series | ET Plus Series – User Manual V1.1 (2021-02-10) (V1.1-2021-02-10) , p. 36 official manufacturer document quote verified
Try to restart the inverter.Check if the fault still occurs