20 miles a day is woefully low for that cost, not to mention where I live, that would be basically useless all winter. Neat concept though
For the same price, I could build you a battery/inverter/charger combo to do more than that per day.
Of course, having fast chargers is an option, but they're not going to be nearly as cost effective as charging using my solar power from home. Unfortunately the car sits in a remote parking lot with no charging options while I'm at work, so I'm trying to be creative. But with a 2-4 day sit...
I plan on building a generic range extender to sit in the back. I've got an odd commute that usually involved around about 165 miles each way, but the car typically sits for 3-4 days before I come home. I plan on using some typical home storage LFP batteries, a small inverter and a small...