Solar Panel Warranty Disputes: Know Your Rights (2026)

A solar panel warranty dispute can be one of the most frustrating homeowner experiences in 2026. Whether your solar panel warranty is not being honored, your installer has gone bankrupt, or the solar company won't honor warranty commitments they made during the sale, understanding your rights is the first step toward resolving the situation. These disputes have become one of the fastest-growing categories of consumer complaints in the solar industry.

Before we dive in, it's important to note that solar warranty disputes can be complex, and the outcome of any particular claim depends on your specific contract terms, the nature of the defect, and applicable state laws. We always recommend consulting a qualified attorney for legal advice specific to your situation.

Solar Manufacturer Warranty vs Installer Warranty: What's Covered

Solar panel systems typically come with multiple overlapping warranties, each covering different components and types of issues. Understanding which warranty applies to your situation is critical for knowing where to direct your claim and what remedies you may be entitled to.

Manufacturer's Product Warranty (10-25 Years)

The manufacturer's product warranty — sometimes called the "materials and workmanship warranty" — covers defects in the physical solar panels themselves. This generally includes manufacturing defects, premature material degradation, delamination of panel layers, cracked cells not caused by external damage, faulty junction boxes or connectors, and frame corrosion or structural failures.

Most major panel manufacturers (such as LG, SunPower, Panasonic, REC, and Canadian Solar) offer product warranties ranging from 10 to 25 years. Premium panels often come with 25-year product warranties, while budget panels may offer only 10-12 years of coverage. It's worth noting that the product warranty is backed by the panel manufacturer, not your installer — this distinction becomes critical if your installer goes out of business.

Performance Warranty (Typically 25 Years)

The performance warranty (also called the "power output warranty") guarantees that your panels will produce a minimum level of electricity over their lifespan. A typical performance warranty might guarantee that panels will produce at least 90% of their rated output at year 10 and at least 80% at year 25.

This warranty is significant because all solar panels degrade over time — they gradually produce less electricity as they age. The performance warranty establishes the floor: if your panels degrade faster than the warranted rate, the manufacturer is generally obligated to repair, replace, or compensate you.

Installer's Workmanship Warranty (5-10 Years)

The installer's workmanship warranty covers the quality of the installation itself — how the panels, racking, wiring, and inverter were installed on your roof. This typically includes roof penetrations and potential leaks caused by installation, wiring errors or electrical issues from installation, improper mounting or racking that leads to damage, and poor conduit routing or weather sealing.

These warranties typically range from 5 to 10 years, though some premium installers offer up to 25 years. Unlike manufacturer warranties, the installer's workmanship warranty is only as good as the installer's continued existence — if the company closes, the warranty generally becomes unenforceable.

Inverter Warranty (10-25 Years)

Inverters — the devices that convert the DC power from your panels into AC power for your home — have their own separate warranties. String inverters typically carry 10-12 year warranties, while microinverters and power optimizers generally come with 25-year warranties. Because inverters are often the first component to fail in a solar system, the inverter warranty may be the one you're most likely to need to use.

Common Solar Panel Warranty Disputes

Based on our research and analysis of consumer complaints, several types of warranty disputes appear repeatedly. Understanding these patterns can help you identify whether your situation may warrant further action.

Performance Degradation Claims

One of the most common disputes involves panels that degrade faster than the warranted rate. Homeowners notice their electricity production dropping significantly — sometimes 20-30% within just a few years — while the company claims the panels are performing "within normal parameters." The challenge here is that proving degradation requires proper testing with calibrated equipment, not just comparing electricity bills (which are affected by weather, usage changes, and utility rate structures).

Workmanship Defects and Roof Leaks

Roof leaks are among the most frustrating warranty issues because they can cause significant damage to your home beyond the solar system itself. When panels are improperly mounted, the roof penetrations may eventually leak — sometimes months or years after installation. The dispute often centers on whether the leak was caused by the installation (covered by installer warranty) or by pre-existing roof issues (not covered). Learn more about solar panels damaging your roof →

Installer Bankruptcy and Abandoned Warranties

With the solar industry experiencing significant consolidation — and a notable wave of installer bankruptcies — many homeowners are discovering that their installer's workmanship warranty is essentially worthless. When the company that installed your system ceases to exist, there may be no entity left to honor the installation warranty. Learn more about solar company bankruptcies →

Finger-Pointing Between Manufacturer and Installer

A particularly frustrating pattern occurs when the manufacturer says the issue is the installer's responsibility, and the installer says it's a manufacturer defect. This circular blame game can leave homeowners without any remedy unless they escalate the dispute formally.

Inverter Failures

Inverters are the most failure-prone component of a solar system. When a string inverter fails, your entire system may stop producing electricity until it's replaced — a process that can take weeks or months if the warranty claim is disputed or the replacement part is backordered. Microinverter failures are less impactful (only one panel goes down), but can be harder to detect without proper monitoring.

Solar Panel Warranty Claim Process: Step by Step

Filing a warranty claim properly from the start can significantly improve your chances of a successful outcome. Here's a step-by-step approach based on our research into industry best practices.

Step 1: Identify the Right Warranty and the Right Entity

Before filing, determine which warranty applies to your issue. If your panels have a manufacturing defect, the claim goes to the panel manufacturer. If the installation caused damage, the claim goes to the installer. If your inverter failed, the claim goes to the inverter manufacturer. Getting this right from the start avoids delays and finger-pointing.

Step 2: Document Everything Thoroughly

Gather all relevant documentation before contacting the warranty provider:

• Your original contract and warranty documents — including any specific warranty terms, exclusions, and claim procedures
• System monitoring data showing performance decline or error codes
• Photos and videos of any visible damage, defects, or leaks
• Utility bills showing production changes over time
• Independent inspection reports if you've had the system evaluated by a third party
• Records of all previous communications with the solar company about the issue

Step 3: Submit the Claim in Writing

Always submit warranty claims in writing — not just by phone. Send a formal letter or email that includes your system details (address, contract number, installation date), a clear description of the problem, reference to the specific warranty provision that applies, the documentation you've gathered, and your requested remedy (repair, replacement, or compensation).

Step 4: Follow Up Systematically

Keep a log of all communications, including dates, names of representatives you speak with, and what was said. If the company doesn't respond within a reasonable time (typically 30 days), send a follow-up letter referencing your original claim and noting the lack of response.

Solar Panel Warranty Not Honored: What to Do Next

If your warranty claim is denied, don't accept the denial at face value. Many initial denials can be successfully overturned through proper escalation.

Get the Denial in Writing

Request a written explanation that specifies exactly why the claim was denied and which warranty provision the company is relying on. Vague denials ("not covered") should be challenged — you have a right to know the specific basis for the denial.

Review the Warranty Terms Carefully

Compare the denial reason against your actual warranty document. Companies sometimes deny claims based on internal policies that may not be supported by the written warranty terms. Look for language about what constitutes a defect, how degradation is measured, what exclusions apply, and what the claim filing procedures require.

Get an Independent Assessment

Hire a certified solar professional (ideally NABCEP-certified) who is not affiliated with your installer to inspect the system and provide a written report. An independent expert opinion carries significant weight if the dispute escalates and can help determine whether the company's denial is justified.

Escalate Within the Company

If your initial claim was denied by a local representative or customer service agent, escalate to a regional manager or the corporate warranty department. Many disputes are resolved at higher levels of the organization, where decision-makers have more authority to approve claims.

File Regulatory Complaints

If internal escalation fails, file complaints with your state attorney general's consumer protection division, the Better Business Bureau (BBB), and your state contractor licensing board. These complaints create an official record and may prompt the company to reconsider — particularly BBB complaints, which many companies respond to in order to protect their rating.

Magnuson-Moss Warranty Act and Solar Panels

The Magnuson-Moss Warranty Act is a federal law that provides important protections for consumers in warranty disputes — and it generally applies to solar panel warranties. Understanding this law can significantly strengthen your position. The FTC provides detailed guidance on warranty protections under this act.

What the Act Requires

Under the Magnuson-Moss Warranty Act, companies that offer written warranties must clearly disclose the terms of the warranty in a single, easy-to-read document. They cannot impose unreasonable conditions on warranty coverage (such as requiring you to use only their authorized service providers for routine maintenance). They must provide a remedy within a reasonable time if the product fails to conform to the warranty. Importantly, a "full warranty" under this act must provide repair or replacement without charge.

Your Legal Rights Under the Act

If a company fails to honor its warranty obligations, the Magnuson-Moss Warranty Act gives you the right to sue in state or federal court. One of the most significant provisions is that if you prevail, the court may award you reasonable attorney's fees — meaning the company may have to pay your lawyer. This provision is designed to make it economically feasible for consumers to pursue warranty claims that might otherwise not justify the cost of legal action.

Class Action Potential

If a manufacturer has a pattern of denying legitimate warranty claims, the Magnuson-Moss Act also provides for class action lawsuits. If you believe your warranty issue affects many other homeowners with the same product, an attorney may be interested in pursuing a class action case. Learn more about solar class action lawsuits →

When Your Installer Goes Bankrupt

The solar industry has experienced a significant wave of installer bankruptcies, leaving thousands of homeowners with unenforceable workmanship warranties. If your installer has gone out of business, here's what you need to know.

What's Lost

When your installer files for bankruptcy or simply closes, the installer's workmanship warranty is typically the first casualty. Since the warranty is only as good as the company behind it, a defunct installer generally can't honor warranty claims for roof leaks, electrical issues, or other installation-related problems.

What's Still Valid

The good news is that manufacturer warranties (both product and performance) are generally not affected by installer bankruptcy. These warranties are backed by the panel manufacturer, which is typically a separate, larger company. The same applies to inverter manufacturer warranties. You'll need to file claims directly with the manufacturer instead of going through your installer.

Steps to Take

• Identify all warranty providers: Review your paperwork to determine which warranties are from the installer vs. the manufacturer
• Register directly with manufacturers: If you haven't already, register your system directly with the panel and inverter manufacturers
• Document your system: Keep records of model numbers, serial numbers, and installation dates for all components
• Check for successor companies: Sometimes a bankrupt installer's warranty obligations are assumed by a successor company or acquiring firm
• Review your lease or PPA: If you have a lease or PPA, the financing company may have separate maintenance obligations that survive installer bankruptcy

When Warranty Issues Justify Contract Exit

In some cases, persistent warranty problems may give you grounds to seek cancellation or rescission of your solar contract. While every situation is different, the following scenarios may support a contract exit, according to consumer protection attorneys we've consulted:

Material Misrepresentation of Warranty Coverage

If the salesperson made specific promises about warranty coverage that differ materially from the actual written warranty, this may constitute a misrepresentation that could support contract rescission. For example, if you were told the system came with a "bumper-to-bumper" 25-year warranty covering everything, but the actual written warranty is far more limited, this discrepancy could be actionable.

Chronic System Failure

If your solar system has required repeated repairs and continues to underperform despite warranty service, you may have grounds to argue that the system is fundamentally defective. Under some state lemon laws and the UCC (Uniform Commercial Code), a product that cannot be repaired to conform to its warranty after a reasonable number of attempts may qualify for replacement or refund.

Breach of Warranty Obligations

If the company flat-out refuses to honor a clear warranty obligation — for example, if your panels are demonstrably producing below the warranted output and the company won't repair or replace them — this breach may give you grounds to pursue legal remedies, including contract cancellation. Learn about getting out of a solar contract →

Documentation Tips for Warranty Claims

Strong documentation is often the difference between a successful warranty claim and a denied one. Here's what to track from day one.

• Keep all original paperwork: Your contract, warranty documents, proposal, and any marketing materials. Store both physical and digital copies.
• Monitor system performance regularly: Check your monitoring system at least monthly and save screenshots or exports of production data. This creates a baseline that makes it easy to identify and prove performance declines.
• Photograph your system annually: Take photos of your panels, wiring, and roof penetrations at least once a year. This helps establish when physical damage or degradation began.
• Log all communications: Keep records of every phone call (date, time, person you spoke with, what was discussed), email, and letter with the solar company. Follow up phone calls with a confirming email ("Per our conversation today...").
• Save utility bills: Keep copies of your electricity bills from before and after installation. These provide additional evidence of system performance over time.
• Get professional inspections in writing: If you hire an independent inspector, make sure they provide a detailed written report with their credentials, findings, and professional opinion.

Frequently Asked Questions