Massachusetts is full of Massh*les that think they know better than anybody else, how to run their own life.
Typically, unless you maintain and properly design and plan a solar system and include storage batteries, you won’t come close to supplying 81% of your home’s electricity needs. Perhaps if you have gas heat, gas stove, and a gas water heater, and don’t run the AC much, it can be more easily attainable.
Most of these systems will fall into disrepair in 3-5 years and the person owning it will just pay confiscatory rates for their power like everyone else in these blue commie states.
BookmarQ for power info (I have gas heat, stove & water heater; would go solar for only A/C and fridge backup)
Your analysis is more detailed than mine - Good 👌 - but as I posted, it is a liberal pipe dream, especially for all the hidden costs that would drive home ownership nearly impossible.
I suspect that the latter outcome is the intended agenda - you will own nothing and be happy.
