Sunseeker II, courtesy Solar Flight website. I was so wrong...again. I mentioned nobody was proposing solar planes. Hell, there is a solar plane already. And it flies. It's called Sunseeker II.
The plane is based in Switzerland. Solar Flight, Bachstrasse 6, Dubendorf 8600, Switzerland. Here's the website. Most recently the plane flew the length of Italy, from Torino to Sicily.
The solar plane carries one person, a pilot. The plane itself weighs around 500 pounds.