2x9 on a SolarEdge HD-Wave single-phase inverter: AC Current Surge / Ground current surge: Ground current surge
Short answer
On a SolarEdge inverter, 2x9 means: AC Current Surge / Ground current surge: Ground current surge. 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: AC Current Surge / Ground current surge: Ground current surge.
Part involved: Residual current / ground fault monitoring (RCMU).
Likely causes:
- Large surge source or irregular load near the site.
- AC connection problem.
Is it safe?
Switch the inverter off at its isolator if the code comes back.
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: may retry; persistent or repeated trips need investigation.
Manual reset: sometimes.
What you can check
- Read and note the exact code and time from the inverter display or app (screenshot).
- Check the solar/battery AC isolator and the consumer-unit breaker/RCD are ON (do not reset a breaker that trips again immediately).
- Do not touch DC cabling or open the inverter; manufacturer says only a qualified technician should handle this.
- If the code persists, contact the installer. SolarEdge's list says 'OFF/ON to reconnect' for some codes - that means the inverter's own ON/OFF switch; only use it if your installer has shown you how. Never open the inverter or touch DC cables/connectors.
What the engineer will check
- Isolate AC and DC, wait for capacitors to discharge (5 min SolarEdge).
- Reconnect strings one at a time to find the faulty string.
- Insulation-resistance test.
- Check AC neutral/earth connections.
Who to ask for: PV installer.
Certification: Electrician competent in grid-connected PV (BS 7671 Section 712; IET Code of Practice for Grid-connected Solar PV), ideally the original MCS-certified PV installer; brand-approved/trained installer to keep manufacturer warranty.
What you might notice
Sources
- User Guide: SolarEdge Inverters Error Codes and Troubleshooting, Version 1.1 (January 2026) ↗ · 1.1 · page PDF p.7 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026