[darkwater]

Not gonna argue on the rest but

> And you ignore the fact that if you use car batteries as storage for the grid, that detracts from their use to, you know, run cars.

well, actually car are parked and not used most of the time, even more during nights when there is no solar energy. And TBH this is my mid-term plan: solar panels to charge it by day and use its battery by night for lights and electric appliances (moving to an electric cold/heat pump for heating it's out of my budget currently, I'm on natural gas)