If you use the battery for internal use (i.e. use it to run your AC during the day) you'll save more than the wholesale price difference from your utility bill

If you use the battery for internal use (i.e. use it to run your AC during the day) you'll save more than the wholesale price difference from your utility bill (since consumer prices are higher than wholesale). A lot of this thinking assumes that you'll have the battery plugged in ready to operate all the time though, and doesn't consider accelerated depreciation on the battery (if that's a problem, I'm not sure).