I’m not sure if I missed it but I also don’t see how they get to how they measure a charging hour. If they are going from 10% to 80% and many vehicles are doing that in far less time, are they just using the average charging speed in miles given from 10% to 80% and multiplying that to get whatever an hour is?
This is why miles per charging hour isn’t a particularly useful metric, since the rate of charge isn’t consistent across a full battery. If you charge from 10-80, drain it and charge 10-80 again and keep doing that until you have an hour of total charge time you’ll get a different number than if you did 50-80 or 10-40 or whatever else.
I think the Out of Spec 10% charge test is the way to go with testing this kind of thing. Start at 10%, charge for 15 minutes and see how many miles you can go before you’re back down to 10%. Seems like a more representative example of how people actually use fast charging in real world scenarios on road trips etc.
I kinda like OOS test as well but realistically I am going to charge for how long my car tells me is best so that should also be a test case on top of what OOS and Edmunds are doing.
It looks like they use 10-80 and then normalize to the 100 mile figure.
Giving only 15 min of charge rewards the cars who have a fast charge for a portion of the curve, particularly early on. This may be why ford does well, they allow much faster charging for a short time.
Whereas an Audi etron has a nearly flat curve. Based on max charge rate it looks middle of the pack, but few can match it for 10-80.
This is why miles per charging hour isn’t a particularly useful metric, since the rate of charge isn’t consistent across a full battery. If you charge from 10-80, drain it and charge 10-80 again and keep doing that until you have an hour of total charge time you’ll get a different number than if you did 50-80 or 10-40 or whatever else.
I think the Out of Spec 10% charge test is the way to go with testing this kind of thing. Start at 10%, charge for 15 minutes and see how many miles you can go before you’re back down to 10%. Seems like a more representative example of how people actually use fast charging in real world scenarios on road trips etc.
I kinda like OOS test as well but realistically I am going to charge for how long my car tells me is best so that should also be a test case on top of what OOS and Edmunds are doing.
How is that different than charging for 15 minutes?
It looks like they use 10-80 and then normalize to the 100 mile figure. Giving only 15 min of charge rewards the cars who have a fast charge for a portion of the curve, particularly early on. This may be why ford does well, they allow much faster charging for a short time. Whereas an Audi etron has a nearly flat curve. Based on max charge rate it looks middle of the pack, but few can match it for 10-80.