I used to think that dust was a big problem with performance looking at the 'data' ---------- but, 2 things changed my mind. 1. I experimented myself and found that there was bugger all difference in a slightly dirty panel output ------
2. It's impossible to overlook the biggest most extreme solar panel experiment in history -
Opportunity and Spirit
how else can we say it ------------------------ solar panels work. They work under the most extreme conditions we can possibly throw at them
so, yes - there are conditions which will pull solar up - a volcanic winter with inches of dust - yep, that'll do it. Aside from that - my god, they are good