The warranty backing your solar panels is one of the most critical factors to consider as you survey your options. Warranties can vary substantially in terms of scope, coverage, and stipulations depending on the manufacturer and intended application.
Power Output Warranties
Some manufacturers back their panels with power output warranties that guarantee a specific panel performance level for a set period of time. For example, a manufacturer may guarantee that peak panel power output won’t fall below 85% for 25 years.
In addition to a power output warranty, manufacturers also may offer an additional warranty that guarantees a higher performance level for a shorter period of time. A secondary warranty, for example, may back 90% power output for the first 10 years of the panels’ life.
On top of performance guarantees, manufacturers provide workmanship warranties to protect you from any defective panel parts. These warranties are generally offered for the first five years after installation.