Solar BuyingGlobal
Solar Panel Warranties Explained: Product vs Performance
What solar panel and inverter warranties actually cover — product warranty, performance warranty, and the fine print that matters.
WaterFuelAndSolarEnergy.com Editorial Team Updated January 2025 7 min read
Solar warranties come in two parts — product (covers the panel itself) and performance (guarantees minimum output over time). Understanding the difference prevents expensive surprises years later.
Typical warranty terms
| Warranty | Typical length | Covers |
|---|---|---|
| Product warranty | 10–25 years | Defects, materials, workmanship |
| Performance warranty | 25 years | Minimum output %, linear degradation |
| Inverter warranty | 5–12 yrs (extendable) | Inverter failure/defects |
Read the fine print
- Is it a linear or stepped degradation guarantee?
- Who actually honours it — manufacturer or installer?
- Is the installer still around to make a claim?
- What does the claim process require (documentation, invoices)?
Should I pay extra for a longer product warranty?
Usually yes if the premium is modest — panels are a 25-year asset. But a 25-year performance warranty is already standard on quality panels.