On Wednesday, June 27, 2012 2:05:53 PM UTC-4, Wayne. B wrote:
On Wed, 27 Jun 2012 09:10:22 -0700 (PDT), wrote:

Another problem not addressed is the battery stores and sources DC, but the power grid is AC. So now we'll have to convert that with big power stations that take DC and convert it to AC. DC motors turning AC generators?

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Absolutely not - high efficiency solid state power inverters.

Being an electronics guy, I thought about inveters... just wondered if you could scale one up enought to power 200 homes, as he says his ultimate big battery will do. Assuming 200 amps per house, that's 40,000 amps. That's one hell of an inverter. And another big heat source, even with the high efficiency.