So, I just bought a house earlier this year. Prior to that, I was charging for all of 2018 exclusively on superchargers. It's a very old house with an old 100 amp service panel located right next to the gas water heater (they almost touch). I want to upgrade my electric panel to at least 320 amps, but my electrician keeps insisting that 200 amps is the absolute maximum for a 1,200 square foot home like mine. You see, I have a Model 3, my wife has a Fiat 500e (soon to be replaced by another Tesla), my sister has an e-Golf, and my parents are considering a Model Y. That's 4 electric cars in total, or 240 amps if charging at the same time, just for the cars. Right now I'm charging my Tesla at work and superchargers, and my wife and sister take turns charging from a 120V outlet. It's extremely inconvenient. We've already installed the wiring for 3 NEMA 14-5 outlets (2 inside garage, 1 outside), and an exterior Tesla HPWC. All that's left is to connect them to the electric panel after upgrading it. We know a family electrician that flat out refuses to do anything more than a 200 amp panel, saying that 300 isn't a thing and 400 would require extra hurdles only for commercial properties. Is that true? I've gotten (MUCH more expensive) quotes from other electricians. Some of whom agree with him in that it's not possible, and others who say it's okay as long as I get explicit permission from the city. Does anyone have any experience with this?