01-19-2021, 09:55 PM
(01-19-2021, 07:26 PM)danbrotherston Wrote: I think you are drastically overestimating the amount of charging that is needed. Load balancing is necessary yes, but ultimately most vehicles are driven only a short distance each day. Average commute distance is around 12 km by some sources I found. So 24 km total round trip. With an average of 6 km / kWh, we need 4 kWh per vehicle per night.
If you assume 18,000 km/year (a convenient number but probably not far off the annual average), that's 50 km/day. That would be about 8 kWh/vehicle/night. Anyway, I did post earlier that I was hoping that someone had done some real work on this, rather than me making gross assumptions. I haven't found anything yet, though.
I don't know how to achieve load-balancing (or, really, power management) at the municipal hydro level, especially since EVs are mixed in with standard residential and commercial consumption: there is no simple way to reduce charging power (only) when the capacity is limited. There is software for doing it at the building level -- it's what our building does, as out transformer and panel have limited capacity for adding chargers, maybe 600 kW at best, which is only good for 20 level 2 chargers.