11 on a GoodWe Technologies Co., Ltd. GoodWe ET / ET Plus+: DC bus high - Internal DC bus voltage too high
Short answer
On a GoodWe Technologies Co., Ltd. inverter, 11 means: DC bus high - Internal DC bus voltage too high. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: DC bus high - Internal DC bus voltage too high.
Part involved: DC bus.
Likely causes:
- Internal DC bus voltage too high; PV voltage exceeds inverter maximum; PV current leaking to ground. | Troubleshooting: Restart; confirm PV voltage in range; measure PV+/PV- to ground (>30 kOhm); contact service.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: Restart per GoodWe troubleshooting guide.
What you can check
- Check the inverter LEDs (FAULT LED on = fault) and read the alarm in the SEMS Portal app or SolarGo app; note code, message and time for your installer.
- GoodWe's first step for this code is a restart. Ask your installer to talk you through it or do it - GoodWe's guide is written for installers and the power-down sequence involves the DC switch and battery.
What the engineer will check
- Check string Voc vs max input; insulation resistance; service.
Who to ask for: GoodWe-trained installer / MCS PV & battery installer.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- Troubleshooting Guide Hybrid Inverter (ET, ET PLUS+, EH, ESA, ES, EM, EHB, ES G2; BT, BH, BP, SBP) - EMEA ↗ · V1.0-2023-03-10 · page 15 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026