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 ARC-FAULT Error: Meaning, Causes & Safe Fix
Your Solis inverter detected an electric arc in the DC wiring — arcing generates intense heat and is a fire risk. Shut down safely if you can and 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?
Is your system producing power right now?
What this code means
ARC-FAULT means the inverter's arc-fault circuit interrupter (AFCI, on models equipped with it) detected the electrical signature of arcing in the DC circuit — typically a loose, corroded, or damaged DC connector. Arcs generate extreme heat and can start fires, so the inverter shuts down immediately.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
- Loose or corroded DC (MC4) connector
- Damaged PV cable with an exposed conductor
- A failing connector that no longer makes firm contact
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 or electrician immediately — arc faults are a fire risk. Only a professional should inspect connectors and cables, replace damaged parts, and recommission the system.
Frequently asked questions
How serious is an arc fault?
Yes — an electric arc can reach thousands of degrees and ignite nearby material. The inverter shut down to stop it; keep it off until a professional checks it.
Can I unplug the DC connectors to check?
No. Never unplug DC connectors while the system is live or while arcing may be present — breaking a DC connection under load can itself create a dangerous arc.
What does an arc fault sound or smell like?
You might hear buzzing or crackling near a connector, or smell hot plastic. If you notice either, shut the system down safely and call your installer immediately — don't investigate up close.
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-1P(1-6)K-4G_V1.3 User Manual (Ginlong Solis), Table 8.1; also Solis S6-GR1P(1-3)K-M User Manual V1.0 (Ginlong Solis), Table 8.1