This is a great idea. I had it just earlier when reading the story! It makes me feel good for all of humanity when I think of a good way to solve a problem, and see that someone else has already done it. To know that there are like minded individuals out there is wonderfull.

It would be bigger than a 200 amp service to a house. Fast charging batteries are great, but a simple system with standardized battery packs to allow battery packs to be swapped out at a "charging station" by a robot, and exchanged for a charged one would also solve the issue of getting cars back on the road within minutes. Pull up, a robot pulls the pack out of the back of your car, places it in a rack, and puts a fresh battery in your car. Total time, 1-2 minutes. Then, the discharged battery is charged overnight at the station, and is ready the next day. Batteries as a service. Much like renting DVDs. And it solves the "I don't want to own or maintain an expensive battery pack in my electric vehicle" problem as well. The cost of the battery wear is included in the cost of paying for a charged battery pack each time. Seems simple to me.