Yes this is info from several places online, I don't have a specific source... Just something I had read somewhere in all the stuff I've been reading lately.
I think I will wait for a used 30kWh car to hit the market and to know I have L2 charging at both ends of the commute before I buy.
I may even wait a little longer for the 200 mile range cars to be on the market...But if a 30kWh car will do the job for a few years, I'm going to do that til I can afford the 200 mile range car.
I'm tired of my own talk about reducing emissions when I burn 3 gallons of gas every day. I talk the talk, it's time to back it up with action.
Also, I think the 15A circuit is generally the accepted procedure. It would be prudent though to have a competent electrician check the wiring gauge for the circuit, as I thought it was now common practice to run 12 gauge wiring as opposed to 14 gauge wiring, and it would be possible it could be upgraded to a 20A circuit with just switching the circuit breaker. I don't know if it would require a permit, or another inspection, but anything done has to remain NEC code compliant, as they would also have to recalculate the capacity of the entire panel to be sure it remained compliant.
I am an electrician, most residential wiring is 14awg wire and 15A breakers. Your 2 kitchen circuits are required to be 20A, one 20A laundry circuit and I think bathroom GFCI outlets are required to be 20A now, but I can't remember. 12awg wire is much more difficult to cram into a box than 14awg and it costs more so there's no reason to use 12awg except for the required circuits.
You can not put a 20A breaker on a 14awg wire.
As for the load calculation, I have to see what my service is and see if installing a larger panel (I have a very small panel with no more breaker space) and a 40A 240 outlet in the garage will overload the wires coming from the main breaker...But I think it's fine. Pretty sure it's a 125A service.