All ARTsolar A-grade modules come with a 25 year linear output guarantee and 12 year structural guarantee. Due to the nature of solar cells, they slowly tend to lose power after decades of constant use. The ARTsolar linear power output guarantee ensure that your investment will never produce less than 80% of its rated power within its first 25 years of use.
The linear output guarantee works like this: ARTsolar guarantees that all modules that pass through our factory will not lose more than 3% of their rated power in their first year of operation and then not more than 0.7% of their rated power per year up until a minimum of 20% within their 25th year of operation.
The below graph demonstrates the above explanation:
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