The big problem here is that it's a tenuous bit of tech without a real application.
What's the 'must-have' application for blimps?
short answer is - NONE. if there was, they would be out there now being used.
People will then go on about using them for internet connectivity etc, but being blunt, this is a non starter too, (if anything, Elon's SpaceX will be the big step forward for global networking).
Look, I am not anti solar, just that this is NOT the right application.