In modeling whether this makes sense, I looked at my annual electricity bill, which comes in at about $1,800/year. That's not enough savings opportunity to justify a ~$70,000 roof+batteries.

However, when I add 2 electric cars, the savings nearly triple [0]. Instead of buying gasoline, I'll be paying for electricity.

At $5,400/year, spending $70,000 starts to make some sense.

On the other hand, if I put up ugly panels and still use the Tesla batteries, aren't I going to save a lot more?

[0] 24,000 miles/year, 225 miles @ $10 per charge, vs. 25 mpg @$3/gal

EDIT: Corrected KWh charge... $10 is cost for one charge.