Solar · Error codes · Solis
UN-G-V01Solis · S6-EH1P L-PLUS 48 V hybrids
UN-G-V01 on a Solis S6-EH1P L-PLUS 48 V hybrids: Grid voltage exceeds the lower voltage range
Short answer
On a Solis inverter, UN-G-V01 means: Grid voltage exceeds the lower voltage range. The inverter stops until the fault clears or is reset.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Grid voltage exceeds the lower voltage range.
Part involved: grid under-voltage.
Likely causes:
- Low grid voltage; wiring.
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.
Manual reset: Restarts when grid normal.
What you can check
- Read the full code and message on the inverter screen or in the SolisCloud app and note the date/time for your installer.
- Check the inverter's AC isolator next to the inverter and the solar/battery breaker in the consumer unit are ON (do not reset a breaker that trips again - call your installer).
- If it happens occasionally it is a short grid disturbance and clears itself; if frequent (especially sunny afternoons) ask your installer to check local voltage with the DNO.
What the engineer will check
- Check grid and AC cable.
Who to ask for: Installer, with DNO (network operator) if grid supply is at fault.
Certification: None for homeowner checks; any grid-protection setting change needs installer and DNO consent (G98/G99).
What you might notice
Sources
- User Manual for S6 Series Hybrid Inverter S6-EH1P(3-8)K-L-PLUS ↗ · Version 1.0 · page 52 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026