I have been thinking of the same thing, we are a four person household, two of which are home every day and $1000 a quarter would be a nice change!
The way I see it, batter storage is about to become a very good thing to have. I see time of use pricing structures in all of our futures so where we are, being stuck with electric cooking it will suddenly make cooking dinner a very costly exercise (Which with a 7 year old in the house you can hardly defer to after the peak rate will end)
Solar with enough capacity to cover the daytime consumption plus enough freeboard to charge a battery system that would then get us over the peak time without dipping into the mains would potentially be a big cost saver. Just have to do the sums to ensure that it is not a matter of pinching money off the power retailer to give it to Tesla.
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