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Usually self-clears

Solis OV-G-V: Grid Overvoltage

Updated June 2026 · Reviewed for technical accuracy · ~3 min read

OV-G-V (over grid voltage, code 1010) is the single most common Solis alarm. It means the grid voltage your inverter measures has climbed above the allowed limit, so it disconnects to protect itself and the grid. It usually clears on its own, but if it happens a lot, especially in the middle of the day, there is often a fixable cause.

What pushes the voltage too high

  • AC cable voltage rise. As the inverter exports at full power, the voltage at its terminals climbs. A long or thin AC cable makes this worse. This is the classic cause of midday OV-G-V.
  • A genuinely high or strong grid. Some supplies simply sit near the top of the allowed band, so the inverter trips easily.
  • A voltage-protection setting narrower than your grid actually runs.

How to handle it

  1. Wait for it to clear. A brief, occasional OV-G-V when the grid swings is normal; the inverter reconnects automatically.
  2. Notice the pattern. If it happens mostly at midday under full sun, that points strongly to AC cable voltage rise rather than a passing grid event.
  3. Have the AC cable checked. A loose or undersized AC cable raises the voltage the inverter sees. Shortening the run or increasing the cable size is the real fix, and that is an installer job.
  4. The protection range can sometimes be adjusted by an installer within what your grid code allows, via SolisCloud or the inverter settings. Don't change safety limits yourself.

Quick decision flowchart

OV-G-V appears
↓ is it rare and brief, clearing on its own?
✅ Yes → a normal grid swing. Nothing to do.
❌ Frequent, especially at midday → likely AC cable voltage rise.
↓
Persistent OV-G-V: installer checks the AC cabling and, if appropriate, the voltage range.

Related Solis codes

UN-G-V, Grid undervoltage OV-G-F, Over frequency GRID-INTF, Grid interference

FAQ

My appliances work fine, so why OV-G-V?

Grid-tied inverters follow strict voltage limits set by the grid code, tighter than what household appliances tolerate. The inverter can trip on a swing your lights barely notice.

It only happens at midday when the sun is strongest.

That is the classic sign of AC cable voltage rise: as the inverter pushes maximum power out, the voltage at its terminals climbs above the limit. Have your installer check the AC cable size and connections.

Sources

  • Solis inverter alarm-code list (OV-G-V = grid overvoltage; check standard setting and grid voltage).
  • Solis installer documentation.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off". This guide covers observation only. AC cabling and protection-setting changes must be done by a licensed installer in line with your grid code.