We won’t waffle on too much about the performance warranty because as you’re about to learn, we aren’t big fans.
The solar panel warranty is unfortunately what is talked about a lot in dodgy solar companies pitch, this is because it’s based on a 25 year period, sometimes 30. Which is a really big number.
They state the warranty on their solar panels is 25 years but this is the performance warranty. Not the product warranty.
The linear performance warranty will warrant the expected degradation of output over the term of the warranty. A good performance warranty will show an output of 84% at 25 years while an outstanding performance warranty will show an output of 90% and above at 25 years.
We here at Teho don’t believe the performance warranty of the solar panel is really worth the paper it’s written on.
We find it hard to understand how an everyday consumer will be able to monitor and graph the expected performance of a solar panel and compare that against the warranty.
There might be a case when you have installed the panels with Enphase Microinverters or an Optimiser solution with monitoring but then who has the time to run the data each year and compare back….then you have to consider dirt, changes in weather patterns and inverter performance losses ….. But you get the point.
We aren’t aware of anyone who has successfully claimed a performance warranty. There are so many variables and it is very difficult for a normal person to be able to prove the difference. A solar farm, maybe