AC10M Volt Fault on a SolaX Power SolaX X1-Hybrid G3: The grid voltage is out of range for the last 10 minutes
Short answer
On a SolaX Power inverter, AC10M Volt Fault means: The grid voltage is out of range for the last 10 minutes. The inverter stops until the fault clears or is reset.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: The grid voltage is out of range for the last 10 minutes.
Part involved: AC grid protection (G98/G99 over-voltage).
Likely causes:
- As described in manual.
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 - reconnects automatically once grid voltage has been back inside limits for the reconnection time.
Manual reset: no.
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).
- Note whether it happens on sunny middays (high export raises local voltage) - tell the installer/DNO.
- Check if neighbours with solar have the same issue.
- Where the SolaX manual says 'press the ESC key to restart the inverter', a homeowner can do that on the display. Steps that say 'disconnect PV+/PV-/battery' are for the installer only.
What the engineer will check
- Measure grid voltage at the origin and at the inverter under export.
- Check AC cable size / voltage rise between inverter and meter (IET PV CoP).
- Confirm country/grid code set to UK G98 or G99 and protection settings unchanged.
- Report persistent high supply voltage to the DNO (statutory limit 230 V +10%/-6%).
Who to ask for: PV installer / electrician; DNO for supply voltage.
Certification: Usually none (grid-side event). If persistent: installer/electrician to measure supply voltage and check settings; DNO investigates supply voltage (G98/G99 protection settings must not be changed without DNO agreement).
What you might notice
Sources
- X1-Hybrid G3 User Manual (EN) ↗ · page PDF p.34-35 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026