If they swap every couple of hours, that's safe, surely? 2 hours on, 2 hours off is... fine.
Debatable.
this is about giant road trips with 14 hours of driving. If you're telling me the DC charging network is capable of supporting htat across Canada in the winter, then I'm happy to hear it, but it feels like it may be some time away
Ah, yes, 'it feels.'
Try this. Go to the A Better Route Planner website. Tell it you want to go from, lets say, North Bay to Edmonton, on Jan 15th, departing at Midnight. That should be plenty 'winter' like.
I picked North Bay Airport to Edmonton Int'l Airport. I drive an Ioniq 5, so used that vehicle profile.
Here's three driving plans, all completely within Canada, all fast-charger stops; i.e. it assumes we're driving around the clock and not stopping someplace to sleep for the night and charge overnight.
Balanced between 'time per charge' and 'number of charging stops' gives us 35 hours of driving time and 8 hours of charging, spread across 19 charges. That's about a stop every two hours, on average, for your piss break and driver changeover. Charging stops range from 8 minutes for a quick top-up to get to the next charger, to an hour for the next long haul.
Optimizing for fewer (but longer) charging stops, we get a little more than 35 hours charging time, 17 stops, but 8 hours, 38 minutes of charging. This is actually a bit less efficient, because the I5 charges very quickly from lower battery levels.
Optimizing for more (but shorter) charging stops, we stay at just under 36 hours driving time, 8.5 hours charging time, and 25 stops ranging from 5 to 40 minutes.
It's faster go cut through the states, of course, rather than go north over Lake Superior, but hey, we're specifying all in Canada, right?
Oh, and just for comparison, if we were to calculate the trip from North Bay Airport to Edmonton Airport leaving right now, i.e. perfect EV conditions, a balance between stops and charge length, 37 hours, with 5.5 hours of charging across 14 chargers, so winter cost us 2.5 hours of extra charging.
But hey, let's go for fucking broke. An All-EV trip from Halifax, Nova Scotia to Prince Rupert, BC, on Jan 15th, departing at midnight. I don't want to take a ferry from St Johns.
Optimized driving path, about 2 days, 19 hours of solid driving, 16.5 hours charging across 34 charge stops, again, ranging from 10 minute top-ups to hour long charges. Middle of winter.
Recalculate it for leaving today, and we get 12 hours, 38 minutes of charging across 31 charge stops. So, yes, the cold temps cost us an extra four hours of charging, total, across a ~6400 km drive.