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For me, I will be an additional $1200 ahead at the end of 10 years if my PV array is entered into the equation after accounting for out of pocket expense for the array and net production over that same period.
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That's $120/year?
I used to tell people that a house that costs what an American home goes for should shelter and feed you and put money in your pocket. I haven't got there myself ....yet.
But the integration of an electric vehicle, solar panels and a (PowerWall™) battery bank goes a long way toward that. The robot gardener would be a free roaming hexapod (robot chicken) that pokes weeds back into the ground while they are still little green shoots.