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Key takeaways
- A product warranty covers defects in materials and workmanship. A performance warranty covers power output relative to the panel's rating, usually stated as a percentage at stated ages.
- Durations vary by model and maker, so read the warranty for your exact panel, not the headline on the listing.
- Claims typically need proof of purchase, a written claim and a return authorization. One maker's warranty applies only to the original purchaser.
- Warranties exclude things like improper installation, modifications and damage from misuse, and they usually do not pay for labor or removal.
- Photograph panels on arrival, keep the invoice and serial numbers, and keep installation records. They are what you will need if you make a claim.
Two warranties in one
A solar panel listing often advertises a long warranty, but the number hides two separate promises.
| Type | What it covers | What it usually means in practice |
|---|---|---|
| Product warranty | Defects in materials and workmanship | Covers a panel that fails because of a defect in how it was made. Duration depends on the model. |
| Performance warranty | Power output over time, relative to the panel's rated output | Covers a panel that produces too little for its age. Stated as an output percentage at stated years, measured under the maker's standard conditions. |
Renogy's published limited warranty document illustrates the split. It covers panels against defects in materials and workmanship, with durations that vary by model. It also describes a separate performance warranty on power output, measured under the maker's standard measurement conditions. Other makers use similar structures but their own terms. Our guide to how long RV solar panels last covers lifespan, which is a different question from what a warranty promises.
Why the performance warranty is harder to use
A product defect is often visible: a cracked cell, a failed connector, water inside the laminate. A performance shortfall is not. A panel on an RV roof in haze, a bit of shade or a dirty surface will always produce less than its rating, so a low reading on a bad day proves nothing.
That is why performance warranties reference standard measurement conditions. The maker wants a measurement made in a defined way. In practice, a claim may need a test that the owner cannot easily run on a roof. Expect to follow the maker's claim process, which may involve returning the panel for testing.
Keep your own records anyway. A log of output readings under similar conditions, taken with the same meter over time, helps you notice a real decline. It is not a substitute for the maker's test, but it tells you when to start a claim. Our efficiency explainer covers why output varies from day to day.
What claims usually require
Warranty documents differ, but a claim process usually has the same steps. The Renogy document, as one maker's example, requires the following.
- Proof of purchase. Original order information is required, and the warranty applies only to the original purchaser.
- A written claim. The claim goes to the warrantor in writing, with a copy of the invoice and a description of the defect or the performance loss.
- A return authorization. Products come back only with a valid return authorization number, issued in advance.
- Shipping. Who pays depends on whether the claim is valid, per the document.
The remedy is usually repair or replacement at the maker's option, and the document describes a refund if neither is possible. It also states that liability is capped at the purchase price. Read your own warranty for these terms, since they vary.
The Federal Trade Commission's business guidance on the Magnuson-Moss Warranty Act adds some background. It explains that a written warranty is full only if it meets a list of conditions, such as free service and a choice of refund or replacement after repeated failed repairs, and is otherwise limited. It also describes the pre-sale availability rule, which means you should be able to read the warranty terms before you buy. Take advantage of it.
What voids or excludes coverage
The exclusions matter as much as the coverage. In the Renogy document they include failures from improper installation, operation or storage, damage from misuse, abuse, neglect, unauthorized repair, modifications or additions, water damage unless the product is rated waterproof, power surges, extreme temperatures and force majeure events. Labor, installation and removal costs are not covered.
Other makers list their own. Read them for these common traps:
- Installation. Following the installation manual is usually a condition. Our guide to installing rigid solar panels helps, but the manual for your panel rules.
- Modifications. Cutting connectors, drilling frames or altering wiring can end coverage. The Renogy document excludes damage from unauthorized repair, modifications or additions.
- Transfer. A warranty limited to the original purchaser may not follow a used panel. See our guide to buying used RV solar gear on eBay and the inspection list in buying a used RV with solar.
- Seller. A listing may come from the maker or from a third-party seller. Check who stands behind the warranty and what the seller says about returns.
Comparing warranties between listings
When two panels look alike on paper, the warranty can be the tiebreaker. Compare like with like.
- Which part is which. A single big number may be only one of the two coverages. Find the product term and the performance term separately.
- Who the warrantor is. The maker, an importer or a reseller. The document names the party you claim against.
- The claim route. Whether you go to the maker or the seller first, and whether a return authorization is needed.
- Costs you carry. Labor, removal, reinstallation and shipping can fall on you even when the claim is valid.
- Fine print on use. Some documents limit coverage for particular uses or environments. Read the section on how the panel may be used and stored.
The same logic applies to bundled kits, where the panels, controller and battery may each carry their own terms. Do not assume one warranty covers the whole kit. Read each document, and keep them together with the receipt.
What to keep and do
Good records turn a hard claim into an easy one.
- Read the warranty before you buy, and save a copy of the version that applies on the purchase date.
- Photograph the panels when they arrive, as in our delivery-day inspection guide, before you install them.
- Keep the invoice, the order confirmation and the serial numbers together, on paper and in a cloud folder.
- Install to the maker's manual and keep dated photos of the mounts, wiring and connectors.
- Log output readings now and then under similar conditions, and write down any problem the day you notice it.
- If you have a problem, contact the maker or seller promptly and ask for the claim steps in writing.
Frequently asked questions
What is the difference between a product and a performance warranty?
A product warranty covers defects in materials and workmanship. A performance warranty covers the panel's power output relative to its rating over time.
How long is a solar panel warranty?
It depends on the maker and the model. One maker's document gives different product warranty durations by model, so read the warranty for your exact panel.
Do I need the original receipt to make a claim?
Usually. The Renogy warranty requires original order information and a copy of the invoice, and applies only to the original purchaser. Check the terms for your panel.
What voids a solar panel warranty?
Common exclusions include improper installation, modifications, misuse and certain environmental damage. The Renogy document lists these and says labor and removal costs are not covered.
Does a performance warranty mean my panel will always make its rated power?
No. Output varies with sunlight, temperature, shade and dirt. A performance warranty refers to output measured under the maker's standard conditions, not what you read on a roof.
Sources and verification
- Renogy limited warranty document: separate materials and workmanship and performance coverage, duration varies by model, performance measured under the maker's standard conditions, original purchaser only, written claim with invoice, return authorization, exclusions including improper installation, modifications, water, surges and labor, remedies of repair, replacement or refund, liability capped at the purchase price. This describes one maker's terms.
- Federal Trade Commission, Businessperson's Guide to Federal Warranty Law: a warranty is full only if it meets five listed conditions and otherwise limited, the pre-sale availability rule requires warranties to be available before purchase.
We quote no warranty durations or output percentages, because they differ by model and maker. Nothing here is legal advice. Read the warranty that ships with your panel and the seller's terms, and contact the maker or seller about a claim.