Re: Dust
The critical thing is that such a system needs both to work, and to be less massive than just building the panels enough bigger to cope. In particular, if it's going to work it will, itself, require some power, so the panels will already need to be bigger enough to provide that power. You can then see that, if you leave it out, it might just be that the bigger panels you needed for it are big enough.
(In real life there's some complicated optimisation problem here of course.)
Biting the hand that feeds IT
