“25-year warranty” sounds impressive on a solar quotation. But two panels with the same headline number can protect you very differently. If you want to compare solar panel warranties before you buy, you need to look at the type of warranty, the guaranteed output, and who will actually honour a claim in Pakistan. This guide shows what to check, with simple examples.
The Warranties You Get With a Solar System
A solar system carries several separate warranties. Many buyers only ask about the panels, but each part of the system matters.
| Warranty Type | Who Provides It | What It Covers | Typical Term |
|---|---|---|---|
| Product (equipment) | Panel manufacturer | Manufacturing defects, material failure, and defect-related damage | 12 to 25 years |
| Performance (power output) | Panel manufacturer | Minimum power output over time | 25 to 30 years |
| Workmanship (installation) | Installer | Wiring, mounting, and installation quality | 5 to 25 years, depending on the installer |
| Inverter and battery | Equipment manufacturer | Electronics failure | Check each datasheet |
Product Warranty vs Performance Warranty
These two panel warranties are often confused. The product warranty covers physical and manufacturing defects. If a panel cracks from a defect or the junction box fails, the manufacturer replaces or repairs it.
The performance warranty promises a minimum power output as the panel ages. Every panel loses a little power each year. The performance warranty sets the limit on that loss. A panel can have a strong performance warranty and a short product warranty, or the other way around. Therefore, always read both numbers.
What to Compare on the Performance Warranty
Look at four details, not only the number of years:
- First-year loss: Many panels may lose about 1 to 2 percent in the first year.
- Annual degradation after year one: Newer N-type TOPCon panels commonly list about 0.4 percent a year. Older P-type panels often list about 0.55 percent.
- Guaranteed output at the end: Current N-type panels commonly guarantee about 87.4 percent at year 30.
- Linear or stepped guarantee: A linear guarantee falls smoothly each year, so it is easier to check.
Terms vary by brand, model, and market. One comparison lists a newer N-type panel with a 25-year product warranty and a 30-year performance warranty. It lists an older P-type panel from the same maker with a 12-year product warranty and a 25-year performance warranty. Always check the exact model you are buying.
A Simple Example
Suppose you buy 400-watt panels. The table shows what each guarantee means at the end of the warranty.
| Panel Type (Example) | Guaranteed Output at the End | Minimum Power of a 400 W Panel |
|---|---|---|
| N-type TOPCon, 30 years | 87.4% | About 350 W |
| Older P-type, 25 years | 83.1% | About 332 W |
The difference may look small. Across a whole system and many years, however, it adds up to a lot of electricity. These figures are examples from one published comparison, so check the datasheet for your own panel.
Who Honours the Warranty in Pakistan?
This is the most important question for Pakistani buyers. A global brand’s warranty is only useful if someone local will process the claim. Ask these questions before you pay:
- Is the seller an authorised distributor or importer of the brand?
- Who handles a claim, the distributor or the manufacturer?
- Who pays for shipping, removal, and reinstallation of a replacement panel?
- Does the warranty card carry serial numbers, an invoice number, and a stamp?
- Will the installer still be in business in ten years?
Reports suggest claims usually start with your distributor. Also, counterfeit and relabelled panels exist in the market. A warranty on paper means nothing if the panel is not genuine.
Check the Exclusions
Read the fine print. Warranties usually do not cover:
- Damage from hail, storms, or other natural events.
- Poor installation, rough handling, or unauthorised repairs.
- Shading, dirt, or low output caused by something other than the panel.
- Panels moved to a new site without approval.
- Claims without proof such as an invoice or a test report.
A performance claim usually needs proof that the panel is producing below the guaranteed level. Ask what test or report the manufacturer will accept.
Compare the Installer’s Workmanship Warranty
Most failures come from poor installation, not the panels. Ask the installer for a written workmanship warranty. It should cover mounting, wiring, roof damage, and leaks. Get the term in years and the claim process in writing.
Compare Inverter and Battery Warranties Too
The inverter is often the first part to fail. Check its warranty term, who services it locally, and how fast a replacement arrives. Do the same for batteries if your system has them. A long panel warranty does not help if the inverter has a short one and no local service.
Red Flags
- The quotation shows only “25-year warranty” with no brand, model, or details.
- The seller will not show the manufacturer’s warranty document.
- There is no serial number list or invoice.
- The price is far below other quotes for the same brand.
- The company has no office or service centre in your city.
- The seller promises “lifetime” cover without any paperwork.
Warranty Checklist Before You Buy
- Get the exact panel model and read its official datasheet.
- Compare product warranty years across quotes.
- Compare performance warranty length, first-year loss, annual degradation, and final output.
- Confirm who handles claims in Pakistan and how.
- Get a written workmanship warranty from the installer.
- Check the inverter and battery warranties.
- Keep the invoice, serial numbers, and warranty cards safe.
If you are also planning to sell power to the grid, read our guide on how to apply for solar net metering in Pakistan.
Frequently Asked Questions
What is the difference between a product and a performance warranty?
The product warranty covers defects. The performance warranty guarantees a minimum power output over time.
How long should a solar panel warranty be?
Premium current panels often carry a 25-year product warranty and a 25 to 30-year performance warranty. Budget or older models can have 10 to 12 years of product cover.
Is a longer warranty always better?
Not always. Check the guaranteed output, the degradation rate, and who honours the claim.
Who handles warranty claims in Pakistan?
Usually your distributor or installer starts the claim. Confirm this before you buy.
Does the installer’s warranty matter?
Yes. Many problems come from installation, and the panel warranty will not cover them.
Conclusion
To compare solar panel warranties properly, look at the type of warranty, the guaranteed output, the claim process, and the exclusions. Ask who in Pakistan will honour the claim, and get everything in writing. Terms change by model and market, so always check the official datasheet for the exact panel you buy. For more guides on solar and daily costs, keep following Pakistan Post. You can also read NEPRA’s solar updates on the NEPRA website.
