A solar panel warranty is one of the most valuable lines on your quote, and one of the least understood. Homeowners often skim past it, assuming a warranty is a warranty, only to discover years later that the coverage they pictured was never actually written down.
The truth is that a residential solar system carries several separate warranties. Each one protects a different part of the system, runs for a different length of time, and comes with its own list of exclusions. That list is what decides whether a future problem costs you nothing or costs you thousands.
This guide breaks down:
- What a solar panel warranty actually covers
- What it quietly leaves out
- How long each warranty typically lasts, by brand
- Whether a home warranty covers solar panels (it usually does not, and we explain why)
- How to read the warranty section on your own estimate before you sign
The Three Warranties at a Glance
Before the details, here is the short version. Almost every residential solar quote includes three separate promises, from two different companies.
| Warranty type | Who backs it | What it protects | Typical length in 2026 |
|---|---|---|---|
| Product (equipment) warranty | Panel manufacturer | Manufacturing defects: delamination, faulty junction boxes, frame corrosion | 12 to 25 years, up to 40 on premium lines |
| Performance (power output) warranty | Panel manufacturer | Output falling below a guaranteed percentage of rated capacity | 25 years, sometimes 30 |
| Workmanship (installation) warranty | Installer | Mounting, wiring, sealing, and roof penetration errors | 1 to 25 years, varies widely by installer |
Two quotes can list the same panels at nearly the same price, yet one backs them with a decade of labor coverage while the other leaves you paying a technician the moment anything needs attention. Because the equipment sits on your roof for a quarter century, the strength of these warranties matters as much as the wattage on the datasheet.
The Three Warranties on a Solar Quote, Explained
Product warranty
Also called the equipment or materials warranty, this comes from the panel manufacturer and covers defects in the panel itself.
Covered under a product warranty:
- Internal cell failures
- Delaminating layers or backsheet separation
- Faulty junction boxes
- Sealed-in moisture
- Premature frame or connector corrosion
Quality panels in 2026 usually carry a 25-year product warranty. The length of this term is one of the clearest signals of how much confidence a manufacturer has in its own build.
Performance warranty (the solar panel performance guarantee)
The performance warranty, also known as the power output warranty or solar panel performance guarantee, guarantees that your panels will still produce a promised percentage of their original rating after a given number of years.
Every panel loses a little output over time through normal degradation. This warranty caps how fast that decline is allowed to happen. A strong modern panel typically guarantees somewhere between 85 and 92 percent of rated output at year 25. If your panels fall below that guaranteed curve, the manufacturer owes you a remedy. Our full breakdown of the expected annual decline explains how installers translate this into a real production number for your estimate.
Workmanship warranty
The workmanship warranty covers the installation itself, not the hardware. It is issued by the installer, not the manufacturer, and protects against faults in how the system was mounted, wired, and sealed.
Covered under a workmanship warranty:
- Roof penetrations flashed or sealed poorly
- Loose or incorrectly set racking
- Wiring or connection errors
Workmanship terms vary widely, from 1 year to 25 years, which makes this the warranty where installers differ most. For a full side-by-side of how manufacturer and installer coverage interact, including who pays for labor when a panel fails, see our guide to installation warranty vs. manufacturer warranty.
What’s Covered vs. What’s Not
| Situation | Covered? | Which warranty |
|---|---|---|
| Panel fails due to a manufacturing defect | Yes | Product |
| Output drops faster than the guaranteed curve | Yes | Performance |
| Roof leak from a penetration the installer made | Yes, while the term is active | Workmanship |
| Hail, wildfire, falling branches, flooding | No | Homeowners insurance instead |
| Roof leak from an aging roof, unrelated to the install | No | Neither |
| Damage from an unauthorized repair or modification | No | Voids coverage |
| Vandalism or animal damage | No | Homeowners insurance instead |
| Normal seasonal output dips from shade, dust, or weather | No, this is not degradation | N/A |
Quick takeaways on exclusions:
- Solar warranties cover defects and installation faults, not outside events.
- Acts of nature are meant to be handled by your homeowners’ insurance, not your panel warranty.
- Letting problems go unaddressed, allowing an unqualified person to modify the array, or adding unapproved equipment can cancel coverage.
If your roof is already older, read our guide on solar panels and roof age before you sign, so a failing roof never gets tangled up with a solar warranty claim.
Typical Solar Panel Warranty Lengths by Brand (2026)
Warranty terms are not standardized across the industry, and this is exactly where buyers get caught off guard comparing two quotes. Here is how the terms tend to stack up across common residential brands, based on published manufacturer figures and industry warranty comparisons.
| Manufacturer | Product warranty | Performance warranty | Guaranteed output at year 25 |
|---|---|---|---|
| Qcells | 25 years | 25 years | About 90 percent |
| Maxeon | 40 years | 40 years | About 88 percent |
| REC | 20 to 25 years | 25 years | 85 to 92 percent |
| Silfab | 25 years | 30 years | About 89 percent |
| Canadian Solar | 12 years | 30 years | About 85 percent |
| Jinko | 12 to 25 years | 30 years | About 83 percent |
| Mission Solar | 25 years | 25 years | About 85 percent |
| Entry-level panels | 10 to 12 years | 25 years | 80 to 84 percent |
A few things worth noting when you compare a quote against this table:
- A longer product warranty is one of the clearest signals of build confidence, but it should be read alongside the guaranteed output percentage, not instead of it.
- Two panels with the same headline “25-year warranty” can retire at very different output levels. The guaranteed percentage at year 25 is the number that actually protects your production.
- Factory-direct panels from an authorized partner, like the Qcells modules installed through Axia Solar Estimate, carry the manufacturer’s full published terms rather than a reseller’s shortened version.
Warranties on the Rest of the System
Panels are only part of the equipment. Inverters and batteries carry their own, often shorter, warranty timelines.
| Component | Typical warranty length | Notes |
|---|---|---|
| String inverter | 10 to 12 years | Often needs replacing before the panels do |
| Microinverter | Up to 25 years | Longer terms are common on premium units |
| Home battery | Around 10 years | Measured in years and total energy throughput |
| Racking | 10 to 20 years | Covers material defects, not installation errors |
Because a string inverter may need replacing well before the panels do, knowing its warranty term and what a replacement would cost out of pocket is part of reading a quote honestly. Our guides to how solar battery storage works and how the main battery types compare break down what to look for in a storage warranty specifically. A battery warranty that guarantees a minimum retained capacity is stronger than one that only counts charge cycles.
Does a Home Warranty Cover Solar Panels?
This is one of the most common points of confusion, and it is worth answering directly: no, a standard home warranty typically does not cover solar panels.
Here is why, and how the three types of coverage actually differ:
| Coverage type | Does it cover solar panels? | What it actually protects |
|---|---|---|
| Home warranty (appliance service contract) | Usually no, unless you buy a specific solar add-on | Major systems and appliances like HVAC, plumbing, and water heaters |
| Homeowners insurance | Often yes, since panels are a permanent roof attachment | Storm damage, fire, theft, and other named events |
| Solar manufacturer and installer warranty | Yes, this is its entire purpose | Manufacturing defects, underperformance, and installation faults |
Home warranty companies generally classify solar equipment as an exterior or structural system rather than an appliance, which is why it is excluded from most standard plans. Some providers do sell an optional solar add-on, so it is worth asking directly if you already carry a home warranty and want it to include your array.
The practical takeaway: your solar system’s real protection comes from its manufacturer and installer warranties, plus your existing homeowners insurance policy for storm and casualty events, not from a general home warranty plan.
How Long Solar Warranties Last and Whether They Transfer
Typical 2026 lengths, side by side:
- Product warranty: 25 years on quality panels
- Performance warranty: 25 years, sometimes 30
- Workmanship warranty: 10 to 25 years, occasionally as short as 1 year
- Inverter warranty: 10 to 25 years depending on type
- Battery warranty: around 10 years
When any single term comes in well short of these ranges, it is worth asking your installer why. A weak link in the chain is where future costs tend to appear.
Transferability, in short:
- Most reputable manufacturer product and performance warranties transfer to a new owner automatically or with simple registration.
- Some installer workmanship warranties are limited to the original owner or allow only one transfer.
- Confirming transfer terms before you buy protects your home’s resale value later, which matters since going solar can affect what you save over time.
Reading the Warranty on Your Estimate
Axia Solar Estimate treats warranty coverage as information you deserve up front, not fine print to decode after the sale. A clear estimate names the product, performance, workmanship, inverter, and battery terms as separate lines, so you can see exactly how long each promise lasts and who stands behind it.
That transparency lets you compare two offers on more than price. A quote with a longer workmanship warranty and a fully transferable product term is worth more than a cheaper one that leaves labor uncovered after a year. Seeing the coverage laid out beside the residential solar system details makes that value obvious, and choosing a strong California solar installer is what makes the workmanship side of that promise hold up.
Making the Warranty Work in Your Favor
Before you sign anything, run through this checklist:
- Separate the product, performance, and workmanship terms on your quote. Do not assume “25-year warranty” means all three.
- Confirm the guaranteed output percentage at year 25, not just the number of years.
- Ask what voids coverage: unauthorized repairs, DIY work, or unapproved equipment additions.
- Check whether the workmanship warranty length roughly matches the product warranty length.
- Confirm whether every term transfers to a new owner, and under what conditions.
- Ask what happens to your workmanship warranty if the installer goes out of business.
When you are ready to see every warranty term spelled out for your own system, you can request a solar estimate from Axia Solar Estimate and compare the coverage line by line.
Frequently Asked Questions
What does a solar panel warranty cover?
A solar panel warranty is really three separate promises. The product warranty covers manufacturing defects in the panel, such as internal failures, delamination, or early corrosion. The performance warranty, also called the solar panel performance guarantee, covers output that falls below a guaranteed percentage of the panel’s original rating over time. The workmanship warranty, issued by the installer, covers faults in how the system was mounted, sealed, and wired.
How long do solar panel warranties last?
In 2026, a strong residential system usually carries a 25-year product warranty and a 25-year performance warranty from the panel manufacturer. The installer’s workmanship warranty ranges more widely, from about 10 to 25 years. Inverters are typically warrantied for 10 to 25 years depending on the type, and batteries for around 10 years.
Does a home warranty cover solar panels?
Generally, no. Standard home warranty plans treat solar panels as an exterior or structural system rather than a covered appliance, so most exclude them by default. Some home warranty companies offer an optional solar add-on for an extra fee. Your real protection comes from the manufacturer’s and installer’s own warranties, plus your homeowners insurance policy for storm and casualty damage.
What is not covered by a solar panel warranty?
Warranties cover defects and installation faults, not outside events. Damage from hail, storms, wildfire, falling branches, flooding, vandalism, or animals is generally excluded and handled by homeowners insurance instead. Roof leaks from an aging roof rather than the installation are also excluded, as is damage from neglect or unauthorized modifications.
What is the difference between a product warranty and a performance warranty?
The product warranty covers physical defects, meaning the manufacturer repairs or replaces a module that fails because of how it was built. The performance warranty covers electrical output, guaranteeing the panel still produces at least a set percentage of its rated power after a given number of years. One protects against a broken panel; the other protects against a panel that quietly underproduces faster than promised.
Are solar panel warranties transferable when I sell my home?
Often yes, but not always. Most reputable manufacturers’ product and performance warranties transfer to the new owner automatically or with simple registration, which helps protect your home’s resale value. Installer workmanship warranties are less consistent, with some limited to the original owner or allowing only a single transfer.