Understanding solar panel warranties including product, performance, workmanship, and inverter coverage. Know what's actually covered before you buy.

Solar panels are a 25-to-35-year investment, and warranties are a critical part of what makes that investment safe. But solar warranties are not as simple as "everything is covered for 25 years." There are multiple warranty types, each covering different things under different conditions. Understanding what is actually protected — and what is not — helps you make smarter purchasing decisions and respond correctly when something goes wrong.

This guide breaks down the four types of solar warranties, what each one covers, what voids them, and how to file a claim if you need to.

The Four Types of Solar Warranties

A complete solar system is protected by a combination of four separate warranties, each provided by a different party and covering different components or scenarios.

1. Product (Equipment) Warranty — Panels

The product warranty covers defects in materials and workmanship of the solar panels themselves. If a panel fails due to a manufacturing defect — delamination, junction box failure, cell interconnect breakage, defective bypass diodes, or frame defects — the manufacturer will repair or replace it at no cost to you.

Typical coverage period: 25 years for premium panels. The panels we install — QCell, REC, and Meyer Burger — all offer 25-year product warranties. Some budget manufacturers still offer only 10 to 12 years of product coverage, which is a significant red flag.

What it covers:

• Manufacturing defects in solar cells, glass, backsheet, frame, and junction box
• Premature failure of internal components (solder joints, ribbon conductors, bypass diodes)
• Delamination (layers separating, causing moisture ingress)
• Defective connectors or wiring pigtails

What it does NOT cover:

• Physical damage from external forces (hail, falling branches, impacts)
• Damage caused by improper installation
• Normal cosmetic wear (slight discoloration, surface scratches)
• Damage from wildlife, power surges, or acts of nature

2. Performance (Power Output) Warranty

The performance warranty guarantees that your panels will produce at least a specified percentage of their rated power output over time. All solar panels degrade gradually — they produce slightly less energy each year as the silicon cells age. The performance warranty sets a floor on how much degradation is acceptable.

Typical coverage period: 25 to 30 years. Premium manufacturers like REC and Meyer Burger now offer 25-year performance warranties guaranteeing 92 percent of rated output at year 25. QCell guarantees at least 86 percent at year 25. Some next-generation panels using heterojunction (HJT) cell technology offer even stronger guarantees because HJT cells degrade more slowly.

How degradation works: Solar panels typically degrade at 0.25 to 0.5 percent per year. A panel rated at 400 watts that degrades at 0.4 percent per year will produce about 360 watts at year 25. If that output falls below the warranty threshold — say, the manufacturer guarantees 86 percent (344 watts) at year 25 — you have a valid warranty claim.

Important nuance: The performance warranty covers inherent degradation of the panel itself, not production losses from shading, soiling, inverter issues, or other external factors. To prove a performance warranty claim, you typically need to demonstrate that the panel itself is underperforming under standard test conditions, which usually requires professional testing equipment.

3. Inverter Warranty

Inverters convert DC electricity from your panels into AC electricity for your home. They are the hardest-working component in your system and typically have shorter lifespans than panels. Inverter warranties vary significantly by type.

Enphase microinverters: 25-year warranty. Each panel has its own small inverter, and Enphase covers manufacturing defects and failures for the full 25 years. This is one of the strongest inverter warranties in the industry and is a major reason we recommend Enphase for most residential systems.

SolarEdge string inverters: 12-year standard warranty, extendable to 20 or 25 years for an additional cost (typically $150 to $350 for the extension). SolarEdge power optimizers carry a separate 25-year warranty. Since the string inverter is the component most likely to fail before the panels, we strongly recommend the warranty extension for SolarEdge systems.

Tesla inverter (integrated with Powerwall 3): 12.5-year warranty covering the inverter as part of the Powerwall unit.

Battery warranties: Tesla Powerwall carries a 10-year warranty. Enphase IQ batteries carry a 10 or 15-year warranty depending on the model. Battery warranties typically guarantee both function and a minimum retained energy capacity (usually 70 percent of original capacity at end of warranty).

4. Workmanship (Installation) Warranty

The workmanship warranty comes from your installer, not the equipment manufacturer. It covers defects in installation — improperly sealed roof penetrations, loose wiring connections, incorrect system configuration, racking failures due to installation error, and similar issues.

Typical coverage period: Varies enormously by installer. Some offer as little as 1 to 2 years. Others offer 10 years. ProGreen Solar provides a 25-year workmanship warranty on every installation, because we believe the quality of the installation matters just as much as the quality of the equipment.

What it covers:

• Roof leaks caused by improperly sealed mounting penetrations
• Electrical connection failures due to improper wiring or termination
• Racking or mounting hardware failure due to installation error
• System design errors that result in underperformance
• Code compliance issues discovered after installation

Why it matters: The workmanship warranty is only as good as the company behind it. A 25-year warranty from a company that goes out of business in year 3 is worthless. When evaluating installers, consider their track record, financial stability, and local presence. A local Colorado installer like ProGreen — rooted in Longmont and serving the Front Range since 2020 — is far more likely to honor a long-term warranty than a national chain that may exit the market.

What Voids a Solar Panel Warranty

Warranties have exclusions, and it is important to know what actions or conditions can void your coverage.

• Unauthorized modifications: Adding equipment, rewiring, or modifying the system without manufacturer approval or by an uncertified installer can void both equipment and workmanship warranties.
• Improper maintenance: Using abrasive cleaners, pressure washers, or harsh chemicals on panels can cause surface damage that voids the product warranty.
• Physical damage from negligence: Dropping objects on panels, walking on them, or allowing unauthorized personnel on the roof near the system can void coverage.
• Operating outside specifications: Installing panels in environments they are not rated for (extreme salt spray, industrial chemical exposure, etc.) can void the warranty. This is rarely an issue in Colorado.
• Failure to register: Some manufacturers require warranty registration within a specified period after installation. Failing to register may reduce your warranty period or void it entirely.

How to File a Warranty Claim

If you believe you have a warranty issue, here is the process.

• Start with your installer. Your installer is typically your first point of contact for any system issue. At ProGreen, we handle the entire warranty process for our customers — diagnosis, claim filing, manufacturer communication, and repair or replacement.
• Document the issue. Note when the problem started, what symptoms you observe, and any monitoring data that supports the claim. Screenshots from your Enphase or SolarEdge monitoring app are valuable evidence.
• Professional diagnosis. The manufacturer will typically require a qualified technician to diagnose the issue and confirm it falls under warranty coverage. This may involve on-site testing, performance measurements, or visual inspection.
• Manufacturer review. The manufacturer reviews the claim, supporting documentation, and diagnosis. Approval timelines range from a few days to several weeks.
• Repair or replacement. If approved, the manufacturer ships a replacement component (or authorizes a repair). The installer performs the physical work. Most manufacturers cover the replacement equipment but may not cover the labor to install it — this is where your installer's workmanship warranty fills the gap.

What Happens If Your Panel Manufacturer Goes Out of Business?

This is a real risk, and it has happened to several solar manufacturers in recent years. If your panel manufacturer ceases operations, their product and performance warranties become unenforceable. No manufacturer, no warranty.

This is one of the strongest reasons to choose panels from financially stable manufacturers with long track records. QCell (backed by Hanwha Group, a Fortune Global 500 company), REC (owned by Reliance Industries, India's largest private company), and Meyer Burger (publicly traded Swiss technology company) all have the financial backing to honor 25-year warranty commitments. We factor manufacturer stability into every panel we recommend — see our solar panel lifespan guide for more on long-term reliability.

Comparing Warranty Coverage Across Manufacturers

Here is how the warranties compare for the panel brands ProGreen installs.

QCell Q.PEAK DUO: 25-year product warranty. 25-year performance warranty guaranteeing at least 86% at year 25. Annual degradation guarantee of no more than 0.54% per year.

REC Alpha Pure-R: 25-year product warranty. 25-year performance warranty guaranteeing at least 92% at year 25. Annual degradation of no more than 0.25% per year — one of the best in the industry.

Meyer Burger HJT: 25-year product warranty. 25-year performance warranty guaranteeing at least 92% at year 25. HJT cell technology provides inherently lower degradation rates.

The practical difference between an 86% guarantee and a 92% guarantee may seem small, but over 25 years it adds up. On a 10 kW system producing 14,000 kWh per year, the difference between 86% and 92% output at year 25 is roughly 840 kWh per year — worth approximately $100 to $130 annually at current Colorado electricity rates.

ProGreen's Warranty Commitment

When you install with ProGreen Solar, your system is protected by a comprehensive warranty package. Our 25-year workmanship warranty covers the quality of the installation itself. The manufacturer product and performance warranties cover the equipment. And we serve as your single point of contact for all warranty issues — you call us, and we handle the rest.

We also register your equipment warranties on your behalf, maintain detailed records of your installation, and proactively monitor your system performance to catch warranty-eligible issues before they become expensive problems.

If you have questions about solar warranties — or want to understand exactly what is covered in a proposal you have received — call ProGreen Solar at (303) 484-1410. We are happy to walk through warranty details with you, whether you are a current customer or still shopping for the right installer.

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