Lost 5% after 1000 hours? What are they making, d

Lost 5% after 1000 hours? What are they making, disposable solar cells? At that rate of deterioration, you’d be approaching 50% it within a 3-4 years. That’s assuming deterioration doesn’t accelerate at higher temperatures. Surfaces in the hot summer sun could easily approach the 60 C (140 F) test temp, especially on dark colors.