"25-year warranty" is one of the most repeated phrases in solar sales pitches — and also one of the most misunderstood. A rooftop solar system actually carries three separate warranties, from three different parties, covering three different things. Knowing the difference is the only way to know what you're actually protected against, and for how long.
The Three Warranties, at a Glance
Panel Product Warranty
Covers manufacturing defects in the physical panel — usually 10 to 12 years from a reputable Tier-1 manufacturer.
Panel Performance Warranty
Guarantees a minimum power output over time as panels naturally degrade — typically extending to around 25 years.
Inverter Warranty
Separate from the panels entirely — usually shorter, and from the inverter manufacturer, not the panel brand.
On top of these three manufacturer-backed warranties sits a fourth, equally important one: the installer's workmanship warranty, covering installation quality — wiring, mounting, and sealing — which no manufacturer warranty touches at all.
1. Panel Product Warranty: Defects, Not Damage
This covers manufacturing faults — cracked cells, delamination, faulty junction boxes, or premature material failure that isn't caused by external damage. Reputable Tier-1 manufacturers commonly offer product warranties in the 10-to-12-year range, though exact terms vary by brand and panel model.
✅ Typically Covered
- Manufacturing defects in cells or frame
- Premature material degradation beyond normal wear
- Faulty junction box or internal wiring from the factory
❌ Typically Not Covered
- Physical damage from storms, falling debris, or impact
- Damage from improper installation
- Unauthorized repairs or modifications
2. Panel Performance Warranty: A Different Promise Entirely
This is not the same document as the product warranty, even though both often appear on the same datasheet. The performance warranty guarantees that your panels will still produce a minimum percentage of their original rated output after a set number of years — commonly structured as a gradual degradation curve extending to around 25 years, rather than a flat number.
| Warranty Type | What It Guarantees | Typical Duration* |
|---|---|---|
| Product Warranty | No manufacturing defects in the panel itself | 10–12 years |
| Performance Warranty | Minimum guaranteed power output over time, on a degradation schedule | ~25 years |
| Inverter Warranty | No manufacturing defects in the inverter unit | 5–10 years (brand-dependent) |
| Workmanship Warranty | Installation quality — mounting, wiring, sealing | Installer-specific |
*Exact durations vary by manufacturer and model. Always confirm terms on the specific warranty card for the equipment quoted to you — don't rely on general industry figures alone.
3. Inverter Warranty: The One Most People Forget to Ask About
Inverters are the component most likely to need replacement or servicing within a system's lifetime, and their warranty is issued by the inverter manufacturer — a completely different company from your panel brand. Inverter warranties are typically shorter than panel warranties, though many manufacturers offer paid extended-warranty options. Always confirm inverter warranty length and terms separately; don't assume it matches your panel's 25-year figure just because both appear in the same sales pitch.
4. Workmanship Warranty: The One Only Your Installer Can Give You
No manufacturer warranty covers installation quality. If a panel leaks because it was mounted incorrectly, or wiring fails because of a poor connection, that's a workmanship issue — and only your installer's own warranty covers it. This is exactly the coverage most likely to matter in Chennai's coastal climate, where corrosion-resistant mounting and proper sealing genuinely affect how well a system holds up over years of humidity and salt-air exposure.
Ask your installer directly: how many years of workmanship warranty do they provide, and what specifically does it cover? Get the answer in writing, not just verbally during the sales conversation.
Good to know: A quote that only mentions "25-year warranty" without specifying which of the four warranties above that refers to is worth a direct follow-up question. Reputable installers will readily break this down; vague answers here are a signal worth taking seriously.
How to Actually File a Warranty Claim
- Document the issue — photos, and generation data from your monitoring app if output has dropped
- Contact your installer first; they typically coordinate with the manufacturer on your behalf
- Keep your original warranty cards, invoice, and installation documentation accessible from day one
- Confirm whether the issue falls under product, performance, inverter, or workmanship warranty, since each has a different responsible party and process
Frequently Asked Questions
How many warranties does a solar installation actually have?
Three separate ones: a panel product warranty covering manufacturing defects, a panel performance warranty covering long-term power output degradation, and an inverter warranty — plus a separate workmanship warranty from your installer covering installation quality. These come from different parties and are not interchangeable.
How long does a typical solar panel warranty last in India?
Product defect warranties from reputable Tier-1 manufacturers commonly run in the 10 to 12 year range, while performance warranties guaranteeing a minimum power output typically extend to around 25 years with a defined degradation schedule. Exact terms vary by brand and model, so always confirm on the specific warranty card for your panels.
Does the solar warranty cover damage from Chennai's humidity or storms?
Manufacturing defects are covered regardless of climate, but damage from external events like storms, flooding, physical impact, or improper installation is generally excluded from standard product and performance warranties. This is exactly why using corrosion-resistant mounting hardware and a workmanship warranty from a reputable installer matters in a coastal city like Chennai.
How do I file a warranty claim if something goes wrong?
Start with your installer, since they typically handle manufacturer coordination on your behalf. Keep your original warranty cards, invoice, and installation documentation, and document the issue with photos and your monitoring app data before reaching out, as manufacturers usually require this evidence to process a claim.
Want a quote that clearly states all four warranty terms in writing? Get a transparent quote from Arka Solar Energy — no obligation.