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Awesome! I live in Alpine and completed a 7.65kw rooftop install at the same time. Our numbers are very similar to yours on payback. I'm also interested in a powerwall type setup, but I think ill wait until RMP offers a time of use plan that makes it cost effective. Great write up!!
0.58 cents per watt for panels right now that will put out more juice than any panel over 10 years old. the manufacturing process has improved panel quality immensely.