First before I say anything else, this is indeed a stupid question. It would be most likely heavy, bulky, and expensive.
But theoretically, is it possible to fly with only Solar energy?
What does it take to accomplish such task? The total cost? Probable shape and size? The power required to lift off such a stupid aircraft?
What does it take to lift off with a single average man piloting the solar-powered aircraft? Without a man?
If you did calculate the amount of power needed, for both lifting a man and not lifting anything but itself, what else could you used that energy for?