2x90 on a SolarEdge HD-Wave single-phase inverter: Islanding - Passive: Grid is down. When AC grid voltage returns the inverter will restart after the reconnection time
Short answer
On a SolarEdge inverter, 2x90 means: Islanding - Passive: Grid is down. When AC grid voltage returns the inverter will restart after the reconnection time. The inverter stops until the fault clears or is reset.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Islanding - Passive: Grid is down. When AC grid voltage returns the inverter will restart after the reconnection time.
Part involved: Loss-of-mains / anti-islanding.
Likely causes:
- Power cut / loss of mains.
- AC breaker or isolator off.
- AC grid voltage malfunction.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
The inverter stops until the fault clears or is reset.
Resetting itself: yes - restarts after the reconnection time once mains returns.
Manual reset: no.
What you can check
- Read and note the exact code and time from the inverter display or app (screenshot).
- Check whether there is a power cut (other lights/sockets, DNO 105 service).
- Check the solar/battery AC isolator and the consumer-unit breaker/RCD are ON (do not reset a breaker that trips again immediately).
- 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
- Check AC isolator, breaker and terminations at the inverter.
- Measure L-N voltage at inverter terminals.
- Check neutral connection.
Who to ask for: PV installer / electrician.
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
- Troubleshooting SolarEdge Systems, Addendum (Europe & APAC) MAN-01-00333-1.2 ↗ · MAN-01-00333-1.2 · page PDF p.4 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026