I was thinking about a "success problem": Suppose EVs become popular and mainstream. Cool! Now, mentally raise your hand if you currently have 3 or more vehicles AND 3 or more drivers at home. Now imagine you need to charge 3 or 4 vehicles in one evening. What's the current draw?
I just installed a 50 amp outlet for my upcoming Roadster (can't wait!). I have a Model S on order. I'll probably want something along the lines of the HPC for the Model S, which puts me at 140 amps total. My whole house is only 200 amps. Many homes in the US are only 100 amps service.
So, what's the future going to be for families with 3 or more vehicles?
I'm thinking they all get plugged in to a single charger unit, which communicates with the cars to figure out which cars need what to get fully charged, and spreads the load amongst the cars and/or sequences which cars get charged when. It might be good to have a way to enter priorities for which vehicles to charge first, and/or enter anticipated mileage for the following day for each car, but that's probably more input than most people will want to give. Another possibility is that many people charge at work, which has the benefit of reducing charge times at home, but has the disadvantage of pulling electricity during prime use hours, which could be a drain on the system (I'm in CA, so we're familiar with rolling blackouts).
What I can't see happening is that all homes in the US get upgraded to 400 amp service. Any other ideas or thoughts here for a many EV future?