Solar Panel Warranty: What’s Actually Covered (and What’s Not)

A typical solar quote will tell you the system has a 25-year warranty, and most homeowners take that to mean their solar is comprehensively covered for 25 years. The reality is more complicated, and the gaps in coverage are where most warranty disappointments happen. There are three separate warranties on every install, they cover different things, they last different lengths of time, and the most important one for protecting your actual investment (the workmanship warranty) is also the one with the most variability between installers. Here\u2019s the full picture.

The three warranties (and why they\u2019re different)

Every residential solar install carries three distinct warranty layers, each issued by a different party and covering different things:

Product warranty (panel manufacturer). Covers defects in the panel itself, including manufacturing defects, material failures, junction box problems, and physical defects like cell cracking or delamination. Typically lasts 10\u201325 years depending on panel tier. The manufacturer pays to replace the defective panel.

Performance warranty (panel manufacturer). Guarantees the panel maintains a minimum power output over time. Almost universally 25 years on residential panels, with premium lines extending to 30. The manufacturer typically replaces or compensates if output falls below the warranted threshold.

Workmanship warranty (the installer). Covers defects in the installation itself: bad wiring, mounting failures, leaks at roof penetrations, system commissioning errors. Duration varies enormously, from 1 year on the cheapest installs to 25 years from premium installers. The installer pays for labor and parts to fix installation defects.

The mismatch is what trips homeowners up. A 25-year panel warranty paired with a 1-year workmanship warranty leaves you covered for panel defects but unprotected for the actual installation defects that cause most real-world problems.

Product warranty: what panels cover

Product warranties protect against defects in the panels themselves. The standard residential range:

• Budget panels (Tier 2/3 brands): 10\u201312 year product warranty
• Mid-tier panels (Jinko, Canadian Solar, REC, LONGi): 12\u201325 year product warranty
• Premium panels (Qcells, Panasonic, Silfab, Maxeon/SunPower): 25\u201340 year product warranty

The 40-year product warranty offered by Maxeon (formerly SunPower) is currently the longest in the residential market. Most premium brands now cluster at 25 years on both product and performance.

Critically, product warranties typically do NOT cover the labor to remove and reinstall a defective panel. If a panel needs to be replaced under warranty, the manufacturer ships you a new panel. You either pay an electrician/installer to swap it (typically $200\u2013$500 for a single panel) or your installer\u2019s workmanship warranty covers the labor. This is one of the main reasons workmanship coverage matters.

Most product warranties also don\u2019t cover shipping costs, weather damage (lightning, hail above a certain size, hurricane wind beyond rated wind load), or damage from improper maintenance or unauthorized repairs.

Performance warranty: what the power-output guarantee actually means

Performance warranties guarantee the panel will produce at least a minimum percentage of its rated output for a specified number of years. Standard structure for 2025\u20132026 panels:

• Standard residential: 80\u201385% of nameplate output at year 25
• Industry average for tier-1 panels: approximately 85\u201387% at year 25
• Premium panels: 88\u201392% at year 25, with some 30-year warranties

The annualized degradation rates that produce these numbers typically run 0.5% per year for premium panels and around 1% per year for budget panels, consistent with the long-running PV Lifetime Project at the National Renewable Energy Laboratory (NREL), which tracks real-world field data on panel degradation. After 25 years, a panel with 0.5% degradation retains roughly 88% of original output; a panel with 1% degradation retains about 78%. The difference compounds over the system\u2019s life.

Performance warranties come in two structures, and the difference matters:

Linear performance warranty guarantees a smooth decline curve: 0.5% per year, ending at 87.5% in year 25. If your panel produces 85% at year 15, you have a claim because the guarantee for year 15 is roughly 92.5%.

Step performance warranty guarantees fixed minimums at specific years: 90% at year 10, 80% at year 25, with no protection between those points. If your panel produces 82% at year 15, you have no claim because the only guarantee at year 15 is implied, not stated.

Linear warranties are strictly better, and most premium panels offer them. Budget panels often use step warranties, which look comparable on the surface but provide less actual protection.

Workmanship warranty: the one homeowners pay least attention to (and probably should pay most)

Here\u2019s the gap that catches most homeowners. The workmanship warranty covers the installer\u2019s actual work, which is where most real-world problems originate. Industry data suggests installation defects (improperly sealed roof penetrations, wiring issues, mounting problems, commissioning errors) drive far more warranty claims than panel defects do.

Workmanship warranty duration is the single most variable element of solar contracting:

• Budget national installers, door-to-door sales: often 1\u20132 years workmanship warranty
• Mid-tier installers: 5\u201310 years
• Reputable local installers: 10\u201325 years
• Premium installers (those certified with brands like Maxeon/SunPower or REC): 25 years

The single most important question to ask when comparing solar quotes is the length and scope of the workmanship warranty. A 25-year panel warranty paired with a 2-year workmanship warranty means you\u2019re uncovered for 23 of the 25 years the system is operating. A 25-year warranty on both means actual long-term protection.

Within the workmanship warranty, also verify what\u2019s specifically covered: labor for panel replacement under product warranty, repairs to roof penetrations, monitoring system replacement, inverter replacement labor, and (most importantly) leaks. A 10-year roof penetration warranty is the practical standard for protecting against the most common real-world install defect.

The orphan warranty problem

Here\u2019s a problem that has become substantially worse since 2023: what happens to your warranty when your solar installer goes out of business. Bloomberg Law has documented multiple solar company bankruptcies in 2024\u20132025, including some large national installers. When an installer goes under:

Your product and performance warranties continue. They\u2019re held by the panel manufacturer, not the installer, so the manufacturer is still on the hook to replace defective panels and honor the performance guarantee.

Your workmanship warranty becomes worthless. When the installer no longer exists, no one is contractually responsible for installation defects. If a roof penetration starts leaking in year 4, you pay to fix it yourself.

Some installers offer third-party warranty backstops (SolarInsure, Align Solar Protection, and similar programs) that continue workmanship coverage even if the original installer goes out of business. These add modest cost ($300\u2013$1,500 typically) but provide real protection against installer bankruptcy. They\u2019re worth considering, especially with smaller or newer installers whose long-term solvency is harder to assess.

What\u2019s typically excluded

Most warranty disputes happen over exclusions, so it\u2019s worth knowing what\u2019s typically NOT covered:

• Weather damage beyond rated wind load (most panels are rated for ~140 mph; hurricane-zone installs need stricter rating)
• Hail damage above a certain size (typically 1\u20131.5 inch; larger hail may be excluded depending on panel)
• Lightning strikes (homeowner insurance typically covers; verify before relying on warranty)
• Damage from improper maintenance (pressure washing, abrasive cleaning, unauthorized modifications)
• Damage from non-original repairs or modifications by anyone other than authorized installers
• Soiling-related performance loss (the system not being cleaned)
• Component upgrades or changes after install (adding capacity may void parts of the original warranty)
• Labor and shipping costs for warranty repairs (usually only the part itself is covered)

Worth asking specifically: does your homeowner insurance cover damage to the solar system? Most policies cover panels as part of the dwelling, but some have specific exclusions or require separate riders. Verify before assuming.

What to ask before signing

The questions that catch warranty gaps in advance:

1. What\u2019s the workmanship warranty duration, in writing in the contract?
2. Does it specifically cover labor for panel replacement under the product warranty?
3. Does it specifically cover roof penetration leaks, and for how long?
4. What happens to my warranty if you go out of business? Do you offer or include third-party backstop coverage?
5. Are product and performance warranties transferable if I sell the home? What\u2019s the transfer process?
6. What\u2019s the response time commitment for warranty claims, and what is the resolution process?
7. What specifically is excluded? Get the exclusions in writing.

A reputable installer answers all of these clearly and puts the answers in writing. An installer who hand-waves or refuses to commit specific terms in the contract is showing you what kind of partner they\u2019ll be for the next 25 years.

What to do next

When you collect solar quotes, compare them on warranty terms, not just price. Two systems at the same price can have dramatically different actual warranty protection. The differences become very meaningful in years 5\u201320 of the system\u2019s life.

Our solar calculator gives you a baseline system size and savings estimate for your specific roof. When you\u2019re ready to compare, get quotes from pre-screened local installers and ask each one the warranty questions above. The installer who gives you a complete written workmanship warranty of 10+ years, with clear leak coverage and a transferable structure, is the one to take seriously regardless of where their price lands.