Solar Panel Warranty Guide (2026)
Published 2026-02-20 · Updated 2026-07-07 · MySunROI Research Team
Free quote comparison
Compare solar quotes in your area
Free — compare pre-screened local installers. No obligation.
MySunROI may earn a fee if you request quotes through partner links. See our disclaimer.
A solar warranty is three contracts glued together: module product, module performance, and installer workmanship — plus a separate inverter warranty. Reading only the “25-year” sticker on a brochure is how homeowners discover gaps after a storm or a contractor exit. This is the MySunROI field checklist.
The four warranties that matter
- Product (module): defects in materials/workmanship — often 12–25 years
- Performance (module): minimum % of rated output at year 25 (commonly 80–92%)
- Inverter / microinverter: 10–25 years depending on topology
- Workmanship (installer): labor and roof penetrations — 10–25 years; confirm who assumes it if the company is acquired
How claims actually work
Start with the installing contractor and your monitoring portal history — manufacturers want production evidence, serial numbers, and installation photos. Underperformance claims may trigger on-site IV curve tests; cosmetic glass damage from hail may route through home insurance first depending on the policy.
Keep the final as-built packet (module serials, inverter SN, permit card, PTO letter). Without it, year-12 claims become archaeology.
Sale and refinance
Owned systems usually allow warranty transfer to a buyer if you register the system and follow the brand’s transfer form. Leased / PPA systems transfer under the finance company’s rules — different animal. Disclose solar early in a listing; appraisers and underwriters will ask.
Solar costs by state
Frequently Asked Questions
Does warranty transfer on home sale?
Usually yes for owned systems if you complete the manufacturer transfer — verify before listing.
Is a 25-year performance warranty a promise of savings?
No — it floors module output, not utility rates, shading changes, or inverter uptime.