I'm a little skeptical of these numbers. At the area of land we're talking about (and the location of the land), dust (or cleaning), abrasive sand, lightning a

I'm a little skeptical of these numbers. At the area of land we're talking about (and the location of the land), dust (or cleaning), abrasive sand, lightning and hail are all going to be an issue for the panel lifetimes, if not their efficiency. They're mostly not in areas with tornadoes, which is nice, but I think 30 years is pretty optimistic.