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It's true that you'd need several units if you want to fully rely on the powerwalls to power your whole house, electric cars, etc. I also read somewhere that its price isn't currently economical. However we must remember this is a first generation tech. Like all new tech will take several iterations before it's perfect but as you say it's a great first step. Plus it'll hopefully kick start a new industry of home energy storage. Also competition in this area should speed up the R&D of batteries in general which will benefit all electronics, including electric cars range. I bet you wouldn't say no to a battery pack upgrade to your leaf ; )