SolarEdge Error 31 — AC Voltage Too High

What Does This Error Mean?

Error 31 on a SolarEdge inverter means grid AC voltage exceeds the maximum allowed by the country's grid code (typically 253V on a 230V grid). The inverter disconnects to protect itself and the grid. The cause is usually upstream voltage too high — the utility may need to address it.

Affected Models

SolarEdge SE3000H
SolarEdge SE7600H
SolarEdge SE10000H
SolarEdge SE11400H-US
SolarEdge HD-Wave

Common Causes

Local grid voltage chronically above the upper limit
Solar production raising local voltage (common in long lines with many PV systems)
Failed local distribution transformer tap setting
Recent grid event (storm or fault) raising voltage temporarily
Inverter voltage measurement calibration drift

How to Fix It

Confirm Error 31 is recurring.

Check SolarEdge monitoring portal for the times Error 31 set. If only 1–2 events in months, it was a transient grid event. Repeat events at predictable times mean a real grid issue.
Test household voltage.

Use a multimeter on a kitchen outlet at peak solar production (mid-day). Voltage should be 230–250V (for a 230V grid). Sustained readings above 250V confirm the issue is grid-side, not inverter.
Contact your utility.

If household voltage is high, contact the utility with documented voltage readings. They may adjust a transformer tap to lower the local voltage. This service is typically free.
Ask installer about inverter settings.

Some countries permit the installer to widen the inverter's grid limits within regulatory tolerance. This is a temporary fix while the utility addresses the underlying issue. Not all jurisdictions allow this.
Check SolarEdge optimizer firmware.

Older firmware on optimizers can cause voltage rise on the rooftop. A firmware update via SetApp may reduce the production-related voltage rise that contributes to Error 31.

When to Call a Professional

Error 31 with confirmed normal household voltage requires the utility to investigate the local grid. The inverter installer can also check the inverter calibration.

Frequently Asked Questions

Why does my SolarEdge get Error 31 in summer?

Summer has the highest production. PV-fed grids tend to have elevated voltage during peak production — a long line with many PV systems can push voltage above limits even when the utility supply is normal. Error 31 in summer afternoons is a classic symptom.

Will Error 31 be fixed when more PV systems are added?

Counter-intuitively, more PV makes voltage rise worse, not better. The fix is utility-side: tap adjustment, grid reinforcement, or smart inverter functions (volt-VAR control) that all SolarEdge inverters support. Speak to your installer about enabling those functions.