This question is part of the Super Big Solar Panel FAQ from Solar Mango, where expert answers to over 100 important questions on solar panels are provided.


Different types of warranties are available for solar panels.

But the main warranty that you should definitely not miss out on is the Performance Warranty, which specifies the efficiency that the solar panel will have over its lifetime.

Good quality p-Si panels will also come with 25 years warranty. Thin films, as they degrade faster, come with a shorter warranty.

Within this warranty, for crystalline solar panels, you can either have a Standard Warranty, or a Linear Warranty. A standard warranty is not as optimal as a Linear Warranty as solar panels sporting the the latter are likely to result in higher generation overall, to the tune of about 5%.

The Linear Warranty could cost a bit more than the Standard Warranty but the results more than compensate for the higher cost.

Super Big Solar Panel FAQGet to know answers to over 100 important questions on solar panels from here.


Let me illustrate better.

Standard Warranty

Manufacturers will usually guarantee a minimum performance for crystalline silicon panels as follows: 90% of the rated output for around first half of 25 years, and 80% of the rated output for the remaining of the 25 years.

Linear Warranty

Better that this guarantee, some panel manufacturer provide a linear performance guarantee. Under linear performance guarantee, usually a maximum degradation of 2.5% is guaranteed in the first year, and some value in the range of 0.5–0.7%/y thereafter.

Over 25 years of operation, a linear performance guarantee can increase cumulative generation of power by more than 5%, at the cost of a slight increase in the price of panels.

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