Thought about it here, but I'm in the NE and my electric bills are about $1300 a year. Would take 30+ years to break even on the system as I'd likely only save about $500 a year.
Probably a totally different story in Arizona, with a decent battery system you'd probably never have an electric bill, but you'd still have to use a lot of power to make it worthwhile to pay for the system.
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