SolarEdge Error 33 — AC Voltage Too Low

What Does This Error Mean?

Error 33 on a SolarEdge inverter means grid AC voltage is below the country minimum (typically 195V on a 230V grid). The inverter disconnects per grid code. Cause is usually a brown-out, brief outage, or chronic low voltage in the local grid. Multiple Error 33 events warrant a utility check.

Affected Models

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

Common Causes

Brief grid brown-out from storm or fault
Chronic low voltage in the local grid (long thin distribution line)
Local heavy loads pulling voltage down (large industrial neighbour)
Failed AC connection at the inverter terminals
Failed home electrical panel breaker connection

How to Fix It

Check whether Error 33 is recurring.

Open SolarEdge monitoring. If Error 33 set once and the inverter recovered, it was a transient grid event. Repeat events suggest chronic low voltage — investigate.
Test household voltage during the event.

If you can, check household voltage when Error 33 is active. Voltage should be 220–240V (230V grid). Sustained readings below 200V confirm a real grid issue — not an inverter problem.
Inspect the home electrical panel.

A loose breaker connection or a damaged main fuse can cause apparent low voltage at the inverter. Have a qualified electrician check the panel — typical inspection cost USD 80–150.
Contact your utility if voltage is consistently low.

Document voltage readings over a week. The utility may need to upgrade transformer tapping, replace conductors, or address upstream issues. The service is typically free.
Check inverter AC connection.

An installer can verify the AC terminal block connections inside the inverter. A loose connection causes voltage drop under load that triggers Error 33. Tightening is a 10-minute job.

Frequently Asked Questions

Will my SolarEdge inverter restart automatically after Error 33?

Yes — Error 33 is auto-recovering. Once grid voltage returns to within limits and stays there for the reconnection period (typically 60 seconds), the inverter resumes production automatically. No manual intervention is needed for transient events.

What is the difference between Error 31 and Error 33?

Error 31 is grid voltage too high (above maximum). Error 33 is grid voltage too low (below minimum). Both are grid-protection events. Error 31 is more common in PV-rich neighbourhoods; Error 33 is more common in long thin distribution lines or during heavy local loads.