Ah yes...because the simple solution is always "just pack up your life, leave behind your family and friends, and relocate half way across the country".
Giving up one foot of space along one garage wall is not a big deal. And if you're worried about physically getting the batteries into place, hiring people would still be cheaper than movers.
Also, a basement that removes cooling costs for the home lab would not make a big difference. If the 800W A/C unit runs 8 hours a day for 4 months out of the year, then it's only about 10% of the home lab power use. Since it's not needed at night it's probably even less.