[fpgaminer]

Your point is valid, but I'd mention that I doubt most people need >40 amp installation. If we talk about your average Joe who gets a Model 3 or equivalent than they're already getting 30mi/h charge at 40 amps. Average Joe only drives 16 miles to work.

We have the 40 amp installation and have never wanted for more.

Somewhat related, but a neat hack might be to get solar installed at the same time. Re-doing the panel would be included as part of the project, which means you can A) get a loan to cover everything, and B) get a 30% credit from the government (in the U.S.). [I say might; our solar installer explained to us offhand that many people do things like that and get other upgrades as well like new water heaters, etc. You'd have to check with your CPA to confirm.] Considering that solar is cheaper over the long-term it's a pretty good deal depending on what loan terms you can get.

[mikeash]

I recently moved and have been lazy about getting a charger installed at the new place. I’ve been plugging into a standard outlet in the meantime. Turns out that’s plenty. I still want to get something faster because it’s more efficient and it would be nice before and after long trips, but there’s no rush.

[yuhong]

Yea, it is a good starting point as many EVs use 30-32A charging (including the short range version of the Model 3 in fact), and fits into the 200A service that most homes since the 1980s have pretty easily.