[brian_]

Most North American homes have max 48kw available for their whole home.

Most newer homes, yes. Most homes in Canada which are a few decades old have 100 amp service, and thus a maximum of 24 kW. That's lots if you're not heating electrically or running a commercial or industrial operation of some sort.

Regardless of the voltage and number of phases, it makes no sense to equip residences with several times as much power capacity as they could ever use, so charging an EV at 40 kW implies either monitoring whole-system current so that the charger can "throttle" down to avoid overload, or shutting off other load circuits while charging.

 

[brian_]

Since 2018 all new homes in Ontario (Which accounts for over 38% of the population of Canada) have to have a 200A panel.
Same holds true for several other provinces.

Yes, but unlike cars, houses last for decades (even centuries), so standards in place for a few years don't reflect the reality of most houses.

Look forward to an even higher code minimum for electrical service to support residential charging stations, although rational management of charging times could reduce that; hopefully, people won't insist on being able to fast-charge at home between getting home from their commute and going out for the evening, while simultaneously cooking dinner and doing laundry. "Smart" metering systems are rare in most of Canada, but that's likely to change.

 

[brian_]

Right, but as range incrases (larger batteries) it takes longer to recharge at home. 120-200 kwh Rivian and Hummer EV owners are going to be surprised when the run the battery down to 10% and plug in at home and the ETA is 24+ hours.

Big heavy vehicles increase energy consumption, but if the daily drive is still under 100 km (as it is for most people) that just means that the overnight charge goes from under 18 kW for typical cars to perhaps twice that for the big pigs... with no need to replace that charge in one hour.

Yes, if you deplete the battery one day and want to use the full range again the next day, you need to charge at a substantial rate somewhere in between. If that's an occasional thing, taking the time and paying the premium for a fast charge at a commercial station seems like a reasonable alternative to providing an industrial level of electrical service to the house.

 

[brian_]

I have a 100kWh pack in my model s performance. @ 48A via the Tesla wall charger it takes me just under 8 hours to charge 80% (10% min to 90% max) This is the max it can charge from a AC charger.

so 16 hours for a 200kWh pack assuming the do not include a larger built in AC charger.

The Tesla 19 kW onboard charger is sized to match the maximum power defined for Level 2 charging. If the car has an onboard charger that size, just using it seems more reasonable than running a high-capacity service into the house and installing another expensive charger; the 19 kW is enough.