Around the world with no petrol?

From this article:

"This is the first time in history a car is travelling around the world only powered by solar energy. I have a big trailer behind me with six square metres of solar powered cells which give me about half of the energy that I need. The other half is produced in Switzerland with solar cells fed into the grid and I'm allowed to take out of the grid the same amount of electricity from my account, which is 6000-kilowatt hours."

I'd be more impressed if he used a trailer with 12 square meters of solar cells to travel the world without connecting to the grid.