As Jimbo said, just not ready for prime time yet. Lots of testing going on, but the cost is just too high to make it affordable. You know how your regular batteries might stop the car when low, then you just turn it off and on again and are able to creep home? Not with lithium. Once they get to the "low" state, they will not allow you to continue until they recharge with the battery management system. If batteries are left uncharged, or damaged, they aren't as forgiving as good old lead acid.
In the north I wouldn't touch solar, but in the Villages or elsewhere along that great sun line, it's a great investment.
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