Warning What does this mean?
Your system is down or running degraded, but this is not an immediate safety danger. Work through the safe steps below.
Solis Inverter GRID-INTF Error: Meaning, Causes & Safe Fix
Your Solis inverter detected interference on the grid connection and stopped as a precaution. A restart usually clears it.
What should I do first?
Two quick questions — we'll point you to the right starting point.
Is this code still showing on your inverter's display?
Is your system producing power right now?
What this code means
GRID-INTF means 'grid interference' (variants 01/02). Electrical noise or disturbances on the AC grid can confuse the inverter's grid monitoring, so it disconnects as a precaution and raises this alarm.What is this downtime costing you?
Rough estimate while your system isn't producing. Adjust the numbers to match your setup.
≈ – kWh of lost production per day.
Estimate only — assumes ~80% real-world output vs. nameplate. Actual losses depend on weather, shading, panel direction, and your tariff.
Common causes
- Transient grid disturbances or electrical noise on the AC line
- Internal power board issue, if the fault persists (the manual's next step is board replacement by a technician)
Safe steps to try
Work top to bottom, ticking off each step as you complete it. 0 of 5 done.
Is your inverter still under warranty?
Before paying for a repair, check — your installer may fix this free.
Based on typical standard warranty terms — always confirm with your warranty card or installer paperwork, as terms vary by model, region, and purchase date.
When to call an electrician
Call your installer if the fault persists after a restart — the manual indicates the power board may need replacement, which is technician-only work. Do not attempt any internal repairs.
Frequently asked questions
Will a restart fix GRID-INTF?
Usually yes — the manual's first remedy is a restart, and transient interference clears on its own.
Is my system at risk?
No, the inverter disconnected itself as a precaution. If it keeps happening, though, get it checked rather than repeatedly restarting.
What causes grid interference?
Usually transient disturbances on the utility grid — switching events, nearby industrial equipment, or storms. If it happens often at the same time of day, keep a log for your installer.
Need a professional?
This fault may need professional diagnosis. Contact a qualified solar electrician in your area.
Sources: meaning and troubleshooting verified against the manufacturer's documentation — Solis S5-GR3P(3-13)K Three Phase Inverter User Manual (Ginlong Solis), Table 9.1