Solar Panel Warranties: What They Actually Cover

Solar proposals often highlight long warranties, but the word warranty can refer to several completely different promises. Understanding them makes comparing equipment much easier.

Product warranty

The product or materials warranty generally covers defects in the physical panel itself, such as manufacturing problems or premature material failures.

Coverage periods vary by manufacturer and product generation, so compare the actual term rather than assuming every premium-looking panel has the same protection.

Performance warranty

The performance warranty deals with how much electricity the panel is guaranteed to produce as it ages. Panels naturally lose some output over time, so the warranty typically specifies a minimum output percentage after a certain number of years.

A lower guaranteed degradation rate is generally preferable, but it should be considered alongside the panel's starting efficiency, cost, and other warranty terms.

Workmanship warranty

This is separate from the panel manufacturer. The installer provides workmanship coverage for problems caused by installation, such as roof penetrations, mounting issues, or wiring problems.

This warranty can be just as important as the equipment warranty because many solar failures are related to installation rather than the panels themselves.

What happens if the installer disappears?

A manufacturer's product warranty may still exist if the installer goes out of business, but workmanship coverage can be harder to enforce. That's one reason an installer's track record and financial stability matter.

Compare the actual documents

Ask for the warranty documents rather than relying on a sales presentation. Look at what is covered, exclusions, labor reimbursement, transferability, and the process for making a claim.

A long warranty is useful only if you understand what it promises and who is responsible when something goes wrong.