@adam_ant: Like Kevin said, it probably won't work without doing something to transduce the hole current to an electron current. At any rate, it's certainly possible and people with solar and other more conventional overunity (err, COP > 1.0) systems sell excess power to the Electric Company all the time. If you do follow that course of action, you would do well to have a fake solar array somewhere just in case the Electric Co. comes snooping around. You don't want to mess with those guys.
@Kevin: Is what I have a gel cell? And how did you source your deep cell batteries? I
do know that you can get them on the cheap if they're not new (and of course, that would be preferable), I just don't know where to get 'em.
