[KineticTroi]

You can build generic powerwalls much cheaper. Just search youtube for build your own powerwall. Also, they make much more sense if your using the packs to power assist car engines, where they can payback within a 1-2 years. Of course, this, depending on your driving habits. For solar home system, I think using a bunch of the 250 watt micro inverters with built in grid tie circuits is a more practical system. Batteries are almost an unnecessary step unless your into the whole disaster prep scene. They can sync your panels to the 60hz grid and turn your meter backwards all without anyone having to be involved. Just a much less complicated system to implement and operate.