Quick Answer
A solar panel warranty's duration and coverage should be evaluated based on its length, whether it covers performance or replacement, and the conditions required to make a claim. Look for warranties that offer a minimum of 25 years of coverage. Be wary of very short warranties or those that limit replacement to a specific part or component.
Evaluating Warranty Durability
When evaluating the durability of a solar panel warranty, consider the length of time it covers. A minimum of 25 years is standard for most solar panels, but some manufacturers offer up to 30 years or more. It’s essential to ensure the warranty covers the entire system, including inverters, mounting hardware, and wiring.
Understanding Coverage and Conditions
Warranties often come with conditions that must be met to make a claim. Look for warranties that cover performance degradation, rather than just parts or components. This ensures the system will continue to produce energy at an acceptable level over the warranty period. Some warranties may require regular maintenance or inspections to remain valid.
Calculating Warranty Value with Kilowatt-Hour (kWh) Math
To put a warranty’s value into perspective, consider the system’s expected energy production over the warranty period. For example, a 5 kilowatt solar panel system producing 8,000 kWh per year would generate 200,000 kWh over 25 years. If the system loses 0.5% efficiency per year, it will produce 195,000 kWh after 25 years. This calculation helps determine whether a warranty’s coverage is sufficient to make up for potential energy losses.
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