Photovoltaic cells are so passe, it’s all about using sunlight to break water down into hydrogen and oxygen.

….a system on a home’s garage roof that is 10 percent efficient could provide enough hydrogen for a fuel-cell car to drive 11,000 miles per year. “The market will have a niche in the home, as people will be able to install their own systems and run their vehicles using the hydrogen produced during daylight hours,”