From recent articles about this, the avg household needs 30kw/ per DAY... 10kWH... 8 hours for $3500? You'd need 3 of them, and a
enormous solar panel rack to ensure you have enough power stored for a
single day.
Quote:
The typical household uses somewhere around 30kWH a day, says Stu Lipoff, an electronics industries consultant and IEEE fellow. So the Powerwall wouldn’t really be enough to keep your home going off-grid for long (depending on how much solar energy you’re putting in)
Source: Wired.com
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Save the world? I don't think so, at least not anytime soon. Rather, it sounds to me like they have a while to go before there is a favorable cost vs. efficiency benefit for most people.