There's no reason you can't power solar panel factories with solar panels (once you've bootstrapped the process of course, but that applies to any power source).
You'd need a lot of land, and also need to put aside a proportion of your production (or profits) to cover those panels as they age.
A proportion of revenue will going on acquiring power regardless of the source.
When Europeans can buy 500W+ Trina panels for $150 shipped, something tells me this one-time investment isn't going to be too insurmountable.