johnlocke wrote: ↑Mon Sep 13, 2021 8:33 pmUnless you hardwire the L2 charger, you're limited to a 50 amp plug. furthermore if you are drawing current for more than 3 hours, you're limited to 40 amps max out of that plug or 9.6 KW. There are plug-in chargers that can do that. Now assuming a100KH battery and 80% discharge (90%-10%), 90% efficiency and 240VAC, you need 9.5 hours to charge back to 90%. If you use a 32A charger instead then you're looking at 11.5 hours. Either way, plug it in when you get home and you'll be charged up in the morning. And who says you have to have a full charge in the morning anyway? Won't 60-70% be enough for the day? And how often are likely to discharge to 10% or less.GRA wrote: ↑Mon Sep 13, 2021 4:49 pmFrom March 29th:https://chargedevs.com/newswire/nissan- ... ctric-suv/The new Nissan will offer a 7.2 kW charging rate on Level 2 AC, and a 130 kW rate on DC.
Given the large 90kWh (87kWh usable) pack (and somewhat for the smaller 65kWh, 63 usable) the charging rates seem too low, particularly L2. Everyone else has gone to 40 or 48A OBCs for packs this size, with the Lucid going back to the 80A that Tesla offered on the S way back when, so 30 or maybe 32A before overhead and losses just doesn't cut it any more. It won't fully charge the car in 8 hours.
DCFC charging rates might be a problem if you're pressed for time, but overnight charging with a typical L2 isn't a problem.
I disagree that you'll want to take that much time to charge, as utilities more and more go to ToU rates with restricted hours. SDG&E only has a 6 hour super off-peak window, 12M - 6a.m. I agree that 40A (so that you can use a NEMA 14-50 on a 50A circuit) is reasonable for rental property, or anyone who wants to have the option of portability provided by using a plug-in EVSE. Personally, I'd routinely charge no more than 50-60% (20 or 30% - 80%) and except in extreme circumstances would normally limit myself to 70% max. (20-90%). I've been considering what I'll recommend to my landlord when the time comes, and am thinking that I'd suggest a 60A circuit terminating in a NEMA 14-50 receptacle. That way the occupant can always choose to hardwire it instead for 48A, a simple swap out rather than re-wiring.
Public L2 is a different matter, as those won't need portability, and you want people to be able to get a substantial charge in 2-3 hours (dinner and a movie, say) as well as overnight use.
Restricting to 30-32A or even 40A assumes that packs won't need to continue to grow beyond 100kWh so that they can provide full replacement for fossil-fueled ICEs, and that's extremely unlikely (barring [PH]FCEVs), so 48A or better is what we should aim at. Initially the public ones may be shared some or all the time, but eventually you'll need full power for each EVSE.