OK, I've got. We've got a small gasoline engine generating power to charge
the batteries. Off the batteries we run heavy duty AC inverter that runs an
AC motor that turns a generator. The generator will then be used to produce
hydrogen from water. The hydrogen is then used to power the actual hydrogen
engine running the van.  Brilliant I say. I'm sure glad I stayed away from
physics class.

Sorry, Friday, couldn't resist with all these engines powering batteries
posts... :) ;)

Bryan