Critical What does this mean?

A safety-rated fault — there may be a risk of electric shock, fire, or equipment damage. Do not try to fix this yourself. Call a qualified electrician.

Solis Inverter Ground-Fault Error: Meaning, Causes & Safe Fix

Your Solis inverter found a ground fault — part of the PV system is touching earth where it shouldn't. This is a shock and fire risk: don't touch anything, call a professional.

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?

What this code means

Ground-Fault (variants 01/02) means the inverter's insulation monitoring detected a ground fault on the PV side — current finding an unintended path to earth, often through damaged cable insulation. The inverter will not generate until it is resolved.

What is this downtime costing you?

Rough estimate while your system isn't producing. Adjust the numbers to match your setup.

System size (kW) Peak sun hours / day Electricity rate ($/kWh)

–per day

–per week

–per 30 days

≈ – 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

Damaged PV cable insulation touching the mounting frame or roof
Moisture inside a DC connector
Cable pinched or chafed during installation

Safe steps to try

Work top to bottom, ticking off each step as you complete it. 0 of 5 done.

Do not touch the inverter, panels, or cables
Note the exact code from the display
Perform one documented restart (AC OFF, DC OFF, 5-minute wait, DC ON, AC ON) only if nothing looks damaged
If it persists, call your installer — they will isolate the faulty string with insulation testing
Keep the area around the equipment clear until it has been checked

Is your inverter still under warranty?

Before paying for a repair, check — your installer may fix this free.

Brand Year installed

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 or electrician immediately. Ground faults need insulation-resistance testing and faulty-string isolation — professional-only work. Never try to find the fault by handling cables or connectors.

Frequently asked questions

Will the system keep working with a ground fault?

No — the inverter refuses to generate until the fault is resolved. That's the protection doing its job.

Can I find the faulty string myself?

Only the documented restart, once. Locating the faulty string means handling DC cables, which is installer-only work.

Can rain cause a ground fault?

Yes — moisture in a damaged connector or cable is a common trigger. If the fault appears in wet weather, tell your installer; it helps them locate the fault faster.

Need a professional?

This fault is a safety risk — do not attempt to fix it yourself. Contact a qualified solar electrician in your area.

Sources: meaning and troubleshooting verified against the manufacturer's documentation — Solis 4G Single Phase Inverter User Manual – US Version (Ginlong Solis), Table 8.1