Cars charge overnight, which is a trough in electric demand. power plants prefer even loads. So car charging loads would be much less stressful than, say, growing population 10% and increasing peak demand.
Except, with some of the suggested solutions, like rooftop solar/etc, we know that over time it causes the normal power usage to invert (see germany, which no longer has a mid-day peak).
That is, the trough is no longer at night, but in the middle of the day.
Ever barring this: think of this another way: If you suddenly increase nighttime usage by several thousand percent, it's unlikely to be a trough anymore, and pretty far into a spike.
THe carport amperage/voltage is usually around 240v/30 amp.
This is a lot, and definitely a ton more than the average power usage of a home at rest or even with the AC on.
At that voltage/amperage, it would take 10+ hours to charge an 85kwh battery
If you go to 240/50 amp, it's about 7 hours, but again, even more of a factor than the average hours residential usage.
This is like having 4-5 high end electric oven on full blast for 7 hours.
(or in maker terms: i have a really nice 3hp table saw, really nice 3hp jointer, planer, cyclone dust collector, cnc machine, vacuum clamp, etc. Having them *all running at once takes less power than the carport :P)
I would bet, in fact, that it would shift peak residential to nighttime by a significant factor (to put some perspective on this: average residential usage is like 25-30kwh a day, so 85 at night would definitely be "huge")
(Again, it's not that i don't think there are solutions, but in grand california tradition, they chase some magically happy utopia without actually ever planning for the long term consequences, then act shocked when they happen)
