Solar panels are a 25-year investment. The warranty that comes with them is the only thing standing between you and a very expensive problem if something goes wrong. And yet most homeowners sign off on installations without fully understanding what they’ve actually been promised.
Solar warranties are more complicated than they look. There are usually three different warranties involved in any installation, they cover different things, and the fine print can gut the coverage you thought you had. Here’s what to look for and what to watch out for.
Contents
- 1 The Three Warranties You Need to Understand
- 2 What a Performance Warranty Actually Guarantees
- 3 What’s NOT Covered (The Fine Print That Matters)
- 4 How to Evaluate the Workmanship Warranty
- 5 Inverter Warranties: Don’t Overlook This One
- 6 Which Panel Warranties Are Best in 2026?
- 7 Frequently Asked Questions
- 7.1 What is a solar panel warranty?
- 7.2 What does a 25-year solar panel warranty cover?
- 7.3 How long should a solar panel warranty be?
- 7.4 Does a solar panel warranty transfer when you sell your house?
- 7.5 What happens to my solar warranty if the installer goes out of business?
- 7.6 What voids a solar panel warranty?
- 7.7 Is the inverter covered under the solar panel warranty?
- 7.8 How do I make a warranty claim on solar panels?
- 8 Summing Up
The Three Warranties You Need to Understand
A complete solar installation typically comes with three separate warranties, each covering a different aspect of the system. Confusing them is one of the most common mistakes homeowners make when comparing quotes.
| Warranty Type | What It Covers | Typical Duration | Who Provides It |
|---|---|---|---|
| Equipment (Product) | Manufacturing defects, delamination, component failure | 25 years (Tier 1); 10–12 years (budget brands) | Panel manufacturer |
| Performance (Power) | Minimum output guarantee (80–92% at year 25) | 25–30 years | Panel manufacturer |
| Workmanship | Roof penetrations, mounting, wiring quality | 1–25 years (installer-dependent) | Your installer |
| Inverter | Inverter hardware failure | 10–12 years (string); 25 years (microinverters) | Inverter manufacturer |
The equipment warranty (also called the product warranty) covers defects in the physical manufacturing of the panels themselves. If a panel fails due to a production flaw, delamination, or component failure, this warranty covers replacement. As of 2026, Tier 1 manufacturers including LONGi, Canadian Solar, JA Solar, Qcells, and REC now offer 25-year product warranties as standard. Budget or lesser-known brands typically still offer only 10-12 years. That gap matters: a 12-year product warranty means if a panel develops a manufacturing defect in year 15, you’re paying out of pocket. When comparing quotes, always check the specific product warranty duration.
The performance warranty (also called the power warranty) guarantees your panels will continue producing a minimum percentage of their rated output over time. This is separate from the equipment warranty and typically runs for 25 years. It accounts for the natural gradual decline in output that every solar panel experiences as it ages.
The workmanship warranty (also called the installation warranty) covers the quality of the installation itself: roof penetrations, mounting systems, wiring, and all the physical work the installer performed. This warranty comes from the installer, not the panel manufacturer, and typically lasts 1-10 years depending on the company. It’s the one most homeowners overlook and often the one most relevant to early problems.
What a Performance Warranty Actually Guarantees
This is where most homeowners misread their contract. A performance warranty doesn’t guarantee your panels will produce a specific kWh amount. It guarantees they’ll produce at least a minimum percentage of their original rated wattage.
The industry standard is to guarantee at least 80-83% of original rated output by year 25. Most manufacturers structure this as either a linear degradation guarantee (e.g., no more than 0.5% decline per year) or a tiered guarantee (e.g., 97% in year 1, 90% by year 10, 80% by year 25).
What that means practically: if you install panels rated at 400W each, they should still produce at least 320W each in year 25. A 10 kW system should still produce at least 8 kW of rated capacity. For most homeowners, this is more than sufficient since it still significantly offsets their electricity bill.
Linear degradation guarantees are generally better for the homeowner because they protect against early performance drops, not just final-year performance. If a panel degrades 3% in year one, a linear guarantee covers it. A simple tiered guarantee might not.
What’s NOT Covered (The Fine Print That Matters)
Equipment warranties from panel manufacturers almost universally exclude:
Labor costs for replacing defective panels. The manufacturer will send you a new panel, but you pay for the technician to go on your roof, remove the old panel, and install the new one. Depending on your location and roof difficulty, that can run $300 to $800 per panel replacement.
Shipping costs for returning defective panels. Some manufacturers require you to ship the defective unit back at your expense before they’ll ship a replacement.
Damage from external causes, including hail, wind, fire, and flooding. Those claims go through your homeowner’s insurance, not the panel warranty.
Problems caused by improper installation. If the installer made an error that led to a panel failure, the manufacturer may deny the claim. This is why the workmanship warranty from your installer matters: it should cover failures caused by installation quality, not just by the panels themselves.
How to Evaluate the Workmanship Warranty
The workmanship warranty is the one that protects you against the most common early problems: roof leaks from poor flashing around mounting hardware, loose connections, wiring errors, and racking issues. Most major installation companies offer 5-10 years of workmanship coverage. Some offer 25 years, which is a strong differentiator.
Check whether the workmanship warranty transfers to new owners if you sell your home. Many don’t. A non-transferable workmanship warranty is a genuine complication if you sell within the coverage period because the new buyer inherits the system without the protection.
Also check what happens if the installer goes out of business. Companies with 25-year workmanship warranties that go under in year 3 leave you without coverage. Some installers back their workmanship warranties through third-party insurance, which survives company bankruptcy. Ask about this specifically.
Inverter Warranties: Don’t Overlook This One
Panel warranties get most of the attention, but the inverter is actually the component most likely to need replacement during the system’s lifetime. String inverters typically carry 10-12 year warranties. Microinverters from Enphase come with 25-year coverage. Power optimizers from SolarEdge come with 25 years on the optimizers and typically 12 years on the inverter.
If your string inverter fails after year 12, you’re buying a new one out of pocket, which currently costs $2,000 to $5,000 installed. This is a real cost that should factor into your system choice and total ownership calculations. Microinverter systems avoid this by spreading the inverter lifespan across many individual units, each under 25-year warranty.
Which Panel Warranties Are Best in 2026?
The gold standard for panel warranties in the US residential market comes from a handful of manufacturers who offer both long equipment warranty periods and strong performance guarantees.
Panasonic and Maxeon (formerly SunPower) remain the benchmark with 25-year product warranties and strong performance guarantees. But the Tier 1 field has largely caught up: REC Group, Qcells, LONGi, Canadian Solar, and JA Solar all offer 25-year product warranties as of 2026. Where these manufacturers still differ is in their performance guarantee terms and degradation rates. A Panasonic or Maxeon panel may guarantee 92% output at year 25, while some Tier 1 budget lines still guarantee only 80-83%. That 9-12 percentage point gap in output guarantee matters over a 25-year ownership period.
The performance guarantee numbers matter more than the headline warranty length. A manufacturer guaranteeing 90% output at year 25 is meaningfully better than one guaranteeing 80%, regardless of whether both claim “25-year warranties.” Read the actual output guarantee in the warranty document, not just the marketing headline.
Frequently Asked Questions
What is a solar panel warranty?
Solar installations typically come with three separate warranties: an equipment warranty covering manufacturing defects (usually 10-25 years), a performance warranty guaranteeing minimum power output over time (typically 25 years), and a workmanship warranty from the installer covering installation quality (typically 1-10 years, sometimes 25).
What does a 25-year solar panel warranty cover?
Most 25-year warranties are performance warranties guaranteeing a minimum output level, usually 80-83% of original rated wattage, by year 25. They don’t typically cover labor costs for replacement, shipping, or damage from external causes like hail or storms. Check the fine print carefully.
How long should a solar panel warranty be?
Look for at least a 25-year performance warranty and a minimum 10-12 year equipment warranty. For workmanship, 5-10 years is standard and acceptable. Anything shorter than 10 years on equipment or 25 years on performance should prompt questions about the manufacturer’s confidence in their product.
Does a solar panel warranty transfer when you sell your house?
Panel manufacturer warranties generally transfer automatically to new homeowners. Workmanship warranties from installers vary; many don’t transfer, which is worth clarifying before you sign. Ask your installer explicitly about warranty transferability if you have any plans to sell within the next decade.
What happens to my solar warranty if the installer goes out of business?
The panel manufacturer’s warranty is tied to the manufacturer, not the installer, so it survives your installer going out of business. The workmanship warranty from the installer does not. This is one reason to verify whether your installer backs their workmanship warranty through third-party insurance, which would survive company closure.
What voids a solar panel warranty?
Common warranty-voiding actions include improper installation (which is why the installer’s certification matters), unauthorized modifications to the panels, failure to maintain the system per manufacturer guidelines, and physical damage from sources other than manufacturing defects. Walking on panels, drilling into them, or modifying the mounting can all void coverage.
Is the inverter covered under the solar panel warranty?
No. Inverters have their own separate warranty, typically 10-12 years for string inverters and 25 years for microinverters. This is one reason inverter type matters for long-term cost planning. A string inverter failure after year 12 is an out-of-pocket expense of $2,000 to $5,000 installed.
How do I make a warranty claim on solar panels?
For manufacturer warranties, contact the manufacturer directly with proof of purchase, your installation date, and documentation of the issue (monitoring data showing output drop, or photos of physical damage). For workmanship issues, contact your installer. Keep all installation documentation including your contract, permits, and system specifications in a safe place for the life of the system.
Summing Up
Solar warranties are more layered than most homeowners realize, and the gaps between what’s covered and what isn’t matter over a 25-year ownership period. The performance warranty headline number is the starting point, not the whole story. Read what’s excluded, check whether labor is covered, understand the workmanship warranty terms from your installer, and factor in the inverter warranty when comparing system types. A slightly higher-priced installation from a company with better workmanship coverage and an established claims process can be worth more than the cheaper quote with thin warranty terms.
For help evaluating installer quotes and understanding what warranty coverage means for your specific system, call (855) 427-0058 or request a free consultation.
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