Grid voltage Too High on a GivEnergy Cloud portal / GivEnergy app and Wi-Fi dongle: Grid voltage too high - ensure the AC isolator is on and AC connections are tight; if connections are good contact the local DNO
Short answer
On a GivEnergy inverter, Grid voltage Too High means: Grid voltage too high - ensure the AC isolator is on and AC connections are tight; if connections are good contact the local DNO. The inverter stops until the fault clears or is reset.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Grid voltage too high - ensure the AC isolator is on and AC connections are tight; if connections are good contact the local DNO.
Part involved: AC grid protection (G98/G99 over-voltage).
Likely causes:
- Grid voltage too high.
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.
- GivEnergy's customer guide allows a restart: turn off the DC (solar) and AC isolators, then restart the battery with its side button; or use the app/portal. Contact the installer if the alarm returns.
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
- List of potential errors: Commissioning portal fault codes and recommendations (UK end-user management) ↗ · page p.1-3 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026