A 30-year warranty is worthless if the manufacturer won't pay. Here's how to read the fine print and enforce claims against Chinese solar panel manufacturers.
Standard 2026 product warranty
25 years
tier-1 N-type
Linear performance warranty
30 yrs
0.4%/yr max degradation
Median claim resolution
45 days
top-5 brands
Product vs performance warranty
Product warranty covers manufacturing defects: delamination, hotspots, junction box failure, frame corrosion, backsheet cracking. Performance warranty guarantees output — typically ≤1% first-year degradation and ≤0.4%/yr thereafter, ensuring ≥87.4% output at year 30.
Exclusions that catch buyers out
- Snail trails and micro-cracks from installation-related mechanical stress
- PID losses if system voltage exceeds panel's PID-resistance rating
- Damage from module cleaning with abrasive or high-pressure equipment
- Any modification of the junction box or connectors
- Corrosion in coastal installations without salt-mist certification
Frequently asked questions
QIs the warranty transferable if I sell the system?
Yes for all top-10 Chinese brands — warranty follows the module serial number, not the original buyer. Notify the regional office to update the registration.
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