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Disappointed about BMW iX DC fast charging speed

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#21 ·
Yes, had set the charger as the destination although was only on the road 10-15 minutes before I arrived there, so not sure if that is long enough to precondition the batteries.
But I was the only one there out of 6 or 8 chargers so you'd have thought I would have got a good rate, especially as the two people who subsequently arrived were both getting over 100.
I probably was about 50% SOC when I got there. I was at the Ionity chargers at Cobham services. Went there on Sunday and Tuesday, not much more than 30-40 kwh/hr either time. Both times had set it as the destination and on Sunday I had driven for over 2 hours to get there so should have been preconditioned OK and SOC was then 30-40% but still only got 30Kwh/hr
 
#22 ·
The SOC also impacts how fast your recharge. The higher the SOC the slower the charging rate. It gets really slow above 90%. Individual chargers can have issues, too. For example, many Tesla superchargers do not deliver the maximum rate for various reasons—fraying cables, age, ambient temps, etc.
 
#23 ·
Barkster said:
Yes, had set the charger as the destination although was only on the road 10-15 minutes before I arrived there, so not sure if that is long enough to precondition the batteries.
But I was the only one there out of 6 or 8 chargers so you'd have thought I would have got a good rate, especially as the two people who subsequently arrived were both getting over 100.
I probably was about 50% SOC when I got there. I was at the Ionity chargers at Cobham services. Went there on Sunday and Tuesday, not much more than 30-40 kwh/hr either time. Both times had set it as the destination and on Sunday I had driven for over 2 hours to get there so should have been preconditioned OK and SOC was then 30-40% but still only got 30Kwh/hr
Click to expand...
My experience is unless you start at a low SOC 20% or less you are never going to hit that charging curve, my charge where I got to 190kW in just 2 minutes I was at 6% SOC it was still at 100kW when I stopped it average of about 130kW.

Saying that your 30 seems low it is a pity the car cannot provide a bit more info on whats going on i.e. reduced charge rate due to .........., I'm not actually sure how the current regulation works from the car or the charger or a combination

I know its easy to say charge at a lower SOC but not always that easy as things stand right now

Image
 
#24 · (Edited)
Thanks for your help
I know that the E-tron and the Polestar were both at about 30-something % when they rocked up, certainly no different to me. And they were blitzing it from the word go, mine was pitiful in comparison. I got 29Kwh in 56 minutes and started at 27%. I have emailed BMW to see what they say.
Image
 
#27 ·
yes I think you are right and, as I said, when I first plugged in yesterday I was the only one there whereas on Sunday I had to wait for one to become free.
Will wait and see what they say.
 
#28 ·
ICS_UK said:
Ionity chargers are allways full output BMW need to come up with an explanation here View attachment 1991
Click to expand...
I don't think you understand. The theoretical maximum charger output is one thing. The actual output is something else. Actual output depends on a slew of variables, not the least of which are SOC, battery conditioning, ambient temps, charger temps, cable/connector temps, etc. Any of those things, and more, can easily cause the charge rate to be throttled for safety reasons.

You will hardly ever get the rated specs you read on paper because, well, this is the real world and not paper.
 
#29 ·
Every time i charged at one of ionitys 350 kW HPC/DC chargers it always started at 150 kW to be reduced by the car gradually pretty much according the announced charging curve. In reality, that means going from 5-85% (61kWh) in 43 min or from 9-80% (55kWh) in 30 min.
Got a feeling of that battery reconditioning prior charging isnt that much use at outside temp of about 20 degrees. After a few minutes of charging it seem to be cooling of the battery that is going on
 
#33 ·
Barkster said:
Two days ago I went to the Ionity charging place at Cobham services on the M25 with my iX xDrive40.
I was the only car there at the beginning.
Plugged into one charger and got about 30kw/hr so moved to another charger and got about 70kw/hr, but this soon dropped off to less then 50kw/hr.
An Audi E-tron then plugged into the charger next to me and got 151kw/hr at one point - this dropped off a bit but he always had well over 100.
Then a Polestar plugged in on the other side of me and he was also getting well over 100. Both of these cars sustained rates at least twice as high as mine even though they were then over 80% charged. Why is the BMW so slow ?
I have seen 122Kw/hr once at Ionity at Jct11 of the M20 but really never seen more than 70 but most of the time less than 50.
I did have Cobham set as a charging destination on my SatNav (as I understand this pre conditions the batteries to accept a charge).
Why is the BMW charging so much slower than others ?
Click to expand...
I already got 146 kW with my iX40. The iX50 goes up to 200 kW.
Probably you did not get higher due to the charging state of your battery.
You can only charge at that rate between 2 and 16% of battery charge state.
You will have 70 kW between 70% and 75%.

See the other topic on this forum for that :
www.ixforums.com

BMW iX Charging

BMW claims that the iX will be able to handle DC fast charging up to 200 kW. With fast charging, the iX's battery will be able to charge from 10-80% in under 40 minutes and get 75 miles of range in only 10 minutes. To make this happen BMW is partnering with EVgo to use their public charging...
www.ixforums.com www.ixforums.com

This is not very different from manufacture to manufacture, but BMW is not leader in this area. The iX50 does it better but has also a larger battery capacity.
On the other hand, fast charging can degradate your battery faster. Limiting charger speed is also conserving your battery on the long term!
 
#34 ·
NomoTesla said:
That's great. Here in the US the only 350 kW chargers I've seen were shared between two vehicles. The only other DC fast chargers here are 150 kW that I've seen.
Click to expand...
That's all depending the electricity network and strategy of the company running fast chargers.
Tesla fast charger are almost always combining 2 cables with a total power of 350 kW (if one vehicle is connected, he could get 350, if 2 vehicles it is divided and each will get 175 kW).
But total capacity can also be divided by more then 2 charging exits. It's depending the load balancing software that is used.
 
#36 ·
ICS_UK said:
My experience is unless you start at a low SOC 20% or less you are never going to hit that charging curve, my charge where I got to 190kW in just 2 minutes I was at 6% SOC it was still at 100kW when I stopped it average of about 130kW.

Saying that your 30 seems low it is a pity the car cannot provide a bit more info on whats going on i.e. reduced charge rate due to .........., I'm not actually sure how the current regulation works from the car or the charger or a combination

I know its easy to say charge at a lower SOC but not always that easy as things stand right now

View attachment 1987
Click to expand...
Barkster said:
Thanks for your help
I know that the E-tron and the Polestar were both at about 30-something % when they rocked up, certainly no different to me. And they were blitzing it from the word go, mine was pitiful in comparison. I got 29Kwh in 56 minutes and started at 27%. I have emailed BMW to see what they say.
View attachment 1989
Click to expand...
Thank you for sharing. As I calculate with the theoretical charging curve, form 27% to 68% should only take 18 min (29kWh as mentioned).
Please give us feed-back on the answer of BMW.
Hope it will be fixed soon.
 
#37 ·
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