I drove 1800 miles in a Hydrogen Car

This makes me imagine a combination of solar and hydrogen system for home electricity. Obviously, the solar panels generate electricity, but only when there is sunlight. However, solar power can be used to generate hydrogen through electrolysis and the hydrogen can be stored in tanks. That hydrogen would then be used to power fuel cells and run day and night.
I guess this isn't much different than simply using a battery, but batteries have their own problems. They're heavy, degrade over time, lose efficiency depending on temperature and are prone to overheating. Not that fuel don't have problems, though.
I dunno. Just spitballing.