Battery power is significantly more effective on much smaller, lighter vehicles, which require less energy to move. Visit http://www.zapworld.com/. You have an interesting idea, which is the tried and proven American Way.

One thing to really consider though is this. If you plan to charge those batteries on a regular basis, and use a conventional 12VDC battery charger, you will need to buy a charger for each battery (or two batteries), to have time to charge them overnight. The overhead and time to do this is enormous. And if each battery charger pulls 10amps, you don't come close to being able to supply that kind of current in a conventional home.