How to File a Solar Panel Warranty Claim: Complete Guide

Your installer closed down last year. Now one of your solar panels has failed — you can see it's not producing. Can you still file a warranty claim? Who do you contact? Will they actually cover it?

The answer is yes, you can file a claim — but you need to understand how solar warranties work. The manufacturer warranty is separate from your installer, and they're legally obligated to honor it.

Types of Solar Warranties Explained

Manufacturer Equipment Warranty (25 years)

The solar panel manufacturer (like SunPower, LG, Canadian Solar, Jinko) warrants their panels against defects for 25 years. If your panel fails due to manufacturing defects, cracking, delamination, or corrosion, they'll replace it. This warranty is independent of your installer.

What's NOT covered: Normal degradation (0.7-0.8% per year), damage from impact or weather events (unless the panel was defective), and misuse.

Inverter Warranty (10-15 years typically)

Your inverter (SolarEdge, Enphase, Fronius, etc.) has a separate warranty from the manufacturer covering defects. Inverter warranties are shorter than panel warranties because inverters are more complex electronics with shorter lifespans.

Workmanship/Labor Warranty (1-10 years, varies by installer)

This is where installer viability matters. A workmanship warranty covers improper installation, wiring errors, and mounting issues. If your installer went out of business, you've lost this coverage (unless another local company will honor it, which is unlikely).

Production Warranty (25 years)

Some manufacturers warrant that panels will produce at least 80-90% of their rated output after 25 years. If your system is severely underperforming and testing shows it's due to panel degradation beyond warranty limits, you may have a claim. This is rare and hard to prove.

How to File a Warranty Claim

Step 1: Gather Your Documentation

• Original purchase agreement or invoice showing equipment and serial numbers
• Photos of the failed equipment and damage
• Monitoring app screenshots showing production (if claiming underperformance)
• Any error codes from the inverter

Step 2: Contact the Manufacturer Directly

Do NOT go back to your installer. Contact the panel or inverter manufacturer directly. You can find contact info on the equipment label on your roof or on your monitoring app.

For panels, look for contact info on the back of a panel (if you can access one) or go to the manufacturer's website and find the warranty support page.

Step 3: Describe the Problem

Tell them:

• Your system size and installation date
• The specific equipment that's failing (panel serial number, inverter model)
• What the problem is (cracked panel, inverter not turning on, isolation fault, etc.)
• What you've observed (production dropped, error codes, visual damage)

Step 4: Request a Professional Inspection

The manufacturer will likely require proof that the equipment is actually defective. They'll ask you to hire a local contractor to do electrical testing or physical inspection. Some manufacturers cover this inspection cost — ask before you pay.

Request an inspection report that specifically addresses whether the failure is a manufacturing defect (covered by warranty) or normal wear/external damage (not covered).

Step 5: Submit Your Claim

Send the manufacturer:

• Original invoice or proof of purchase
• Photos of equipment and damage
• Professional inspection report
• Signed claim form (provided by manufacturer)

Keep copies of everything.

What to Expect in the Claim Process

Approval timeline: 30-60 days from submission. The manufacturer will review the inspection report and determine if it's a covered defect.

What they'll cover if approved: Replacement equipment, not labor. They'll ship you a replacement panel or inverter. You need to pay a technician to install it (typically $300-500 for a panel, $1,000-1,500 for an inverter).

What they won't cover: Normal degradation, physical damage from weather or impact, installation costs, loss of production during downtime.

If Your Installer is Gone

This actually doesn't affect your equipment warranty. The manufacturer doesn't care whether your installer is still in business — they're obligated to honor their warranty.

However, the manufacturer will ask you to provide proof of installation. Usually the original invoice or serial number on the equipment is sufficient.

If you lost all documentation, the manufacturer may require a technician's inspection to verify the equipment is genuine and properly installed.

What If the Manufacturer Denies Your Claim?

If they deny the claim, ask for detailed reasoning. Common denial reasons:

• Normal degradation: If your panel degradation is 0.8% per year, it's not a warranty claim
• External damage: Impact damage or water intrusion isn't a manufacturing defect
• Installation defect: Your installer wired it wrong (not a manufacturer problem)
• Out of warranty: 25-year warranty has limits; they may ask for proof of install date

If you disagree with the denial, request escalation to the manufacturer's warranty manager. Provide additional documentation or a second independent inspection if necessary.

What If You Suspect Accelerated Degradation?

If your panels are degrading faster than 1.5% per year (vs. expected 0.7-0.8%), you may have a warranty claim. However, proving this requires:

• Accurate baseline output data from installation
• Production data from every month since installation
• Weather data for every month to adjust for seasonal variations
• Professional analysis comparing actual degradation to expected rates

This is complex to prove, which is why ongoing monitoring matters. If you've been tracking your system with SolarDoctor since year one, you have the data to prove accelerated degradation if it's happening.