No, at nighttime, your electrical system is pulling 0.5 HP (well, a bit more -- you're heating up the alternator as well) off the engine.
If you are going to run off hydrogen you make yourself, you will get out NO MORE than what you put in. Which means 0.5 HP at best.
Dude, you DESPERATELY need a basic physics course. It will pay for itself with all the scams you won't fall for.
As for it "never being proven," that's equivalent to claiming GPS doesn't work. Yup, you use the same physics for that (as well as how the satellites got there in the first place) as you do to say this "HHO generation" thing is a load of crap.