It's kind of an odd setup, really. Hydrogen isn't a power source, it's a storage device. From what I've seen, hydrogen is less efficient than batteries, in terms of the process to convert electricity into hydrogen, and then convert hydrogen back into electricity. Batteries typically do this task far more efficiently.

The Republic had a story about the house a month or two ago that made him sound like a real weirdo, IMO. The part about no glue, drywall, paint, etc.. they have some quote where he sounds like Howard Hughes with the aversion to germs and contact with chemicals and stuff. It's a cool setup, but I can't see how this is more beneficial than doing a solar/battery setup using NiMH instead of lead acid, which is typically used for solar arrays. NiMH would be much more environmentally friendly and again, should be a more efficient storage means than thw loss in converting to and from hydrogen.