> part of the selling point of rooftop solar is it feels good
As someone who's been building an off-grid solar system this is largely the case. I've spent thousands on panels and batteries, my electricity bill is only a few hundred a month but we have frequent outages during storm season. It's definitely more of a feel good and control thing. If I consider the cost of running the electricity to our remote location, I'd probably barely break even in 10 years if I'm lucky.
If you spend US$6000 on panels and batteries, your electricity bill is US$300/month, and the outages and power lines cost you nothing, then your payback time for the off-grid solar system would seem to be 20 months, under two years, not 10 years. The outages and power lines would seem to shorten the payback time further, not lengthen it. Without disparaging the feel-good control thing, which I think is reasonable and important, I feel like I must be misunderstanding something about your explanation.
As someone who's been building an off-grid solar system this is largely the case. I've spent thousands on panels and batteries, my electricity bill is only a few hundred a month but we have frequent outages during storm season. It's definitely more of a feel good and control thing. If I consider the cost of running the electricity to our remote location, I'd probably barely break even in 10 years if I'm lucky.