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Discussion Starter · #5 ·
This has been documented in studies.

"The researchers found that charging times increased significantly when the weather got cold. When an EV battery was charged at 77 degrees, a DCFC charger might charge a battery to 80 percent capacity in 30 minutes. But at 32 degrees, the battery's state of charge was 36 percent less after the same amount of time."

 

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This has been documented in studies.

"The researchers found that charging times increased significantly when the weather got cold. When an EV battery was charged at 77 degrees, a DCFC charger might charge a battery to 80 percent capacity in 30 minutes. But at 32 degrees, the battery's state of charge was 36 percent less after the same amount of time."

The issue is the magnitude of the drop in charging speed. Since Toyota "strongly recommend" AC charging as you approach 32°F and below, it implies that at that temperature, the DC Fast Charging speed is less than 6.6 kW. That's roughly a 90% drop from the average rate 0-80% in normal temperatures. There's something strange about this, since it isn't the outside temperature that determines charging speed. It's battery temperature. And this battery is supposed to be thermally managed very well via the heat pump, etc.
 

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approach 32°F and below, it implies that at that temperature, the DC Fast Charging speed is less than 6.6 kW. That's
Is it that DCFC is slower? My take is that with AC charging, the car can take as long as it wants to get the battery up to temperature and then start charging. You wouldn't want the car to sit on a DCFC for 20 minutes warming up before starting to charge. I don't know if (or why/why not) the bZ4X has battery preconditioning that would have it prepared to take a DCFC in cold weather, but it definitely has a traction battery heater that runs during (or maybe before) AC charging.
 

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2022 Hyundai Ioniq 5 Preferred AWD LR
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@SteveH: Don't buy Kia either, because they said the same thing (in the EV6 manual).

View attachment 753
It doesn't say "DC charging won't work". On an EV6, the battery starts heating when you hook up to a charger. Will be nice when that happens in advance. It doesn't sound like Toyota has any plans to heat the battery for charging.
 

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Discussion Starter · #16 ·
I am referring to DC charging effecting battery life rather than DC won't work in the cold. I don't plan to drive far in winter months.

It doesn't say "DC charging won't work". On an EV6, the battery starts heating when you hook up to a charger. Will be nice when that happens in advance. It doesn't sound like Toyota has any plans to heat the battery for charging.
 

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Somethings strange about the info in that pamphlet. The owners manual does not have any such dire warning about it taking 5x longer below -10C. The owners manual does mention that it has a battery heater that works when charging, DC or AC. There is no mention of battery preheating. This seems like a rather large design mistake, to not allow for preheating before DC fast charging.
 

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2022 Hyundai Ioniq 5 Preferred AWD LR
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But a common large design mistake, based on other EVs I've read about.
Yeah, my one major knock on the Ioniq 5 is that heating only starts when you plug into a DC charger. Everything is there for pre-heating except a software mechanism to start it. Everyone will get there eventually if the hardware is set up for it.
 
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