Petrol to hydrogen conversions (HHO)

[Dan Howard]

How about this video, which is a toy car that runs on hydrogen from water. But the neat thing is that the power to generate the hydrogen is from a solar panel. In other words, the hydrogen generation costs zero energy, sourced from the biggest free energy source in the solar system.

http://www.youtube.com/watch?v=94VHhQW6 ... re=related

It doesn't cost zero energy. It takes more energy to create hydrogen than the energy released when the hydrogen is recombined. It is far more efficient to simply use the solar panel to drive an electric motor. Where hydrogen is useful is that it can be stored for occasions when the sun isn't shining or when more energy is required than can be generated from the solar panel. Hyderogen is simply a fuel just like petrol, or LPG or ethanol, etc. The difference is the efficiency of the fuel, its methiod of manufacture, and how polluting it is.