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Discussion Starter · #1 ·
Hi all

Just checking whether any MINI SE owners here have problems charging at the stated 45-50kWh DC charging speed. Our June 2022 MINI Electric has failed to charge at the DC after its first charge of the day. After driving for 140-150km, to recharge the MINI, the speed will drop to 22-12kWh. No problems with AC charge (with our experience so far). A BMW/MINI executive told me that as stated in the manual, that slow charge happens, as the car and battery is too hot after the drive. It's winter in Australia (Canberra) since we started driving the car. We've done our research via reviews and YouTube videos before purchasing the car and has never heard of the problem. The most extreme and frustrating experience was to charge from 2%-100% (29kWh) and it took 2hrs 41mins. Since day one that we've owned the car, it has never been able to do a back to back DC charge at MINI's stated speed.

To worsen the issue, the power drops significantly after the charge. The MINI Garage has attempted to repair the vehicle to no effect.

We know the short range MINI is not designed for long trips, but not being able to do the very least of 2 back to back DC charging just sounds ludicrous.

Really appreciate to hear from fellow MINI EV users on their experience.

Cheers.
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Interesting, I’ve done a 350mile trip in one day at mostly motorway speeds with four back to back DC rapid charges. All using 50kWh or higher charges and not noticed any issues with either charge speed or drops in power. There were differences in charge time and and power output which I assume were down to external temperature and battery temperature but nothing that really made a stop longer than 25 minutes. These charges were typically from 13% to 85% though so not as low as 2%. I’ve only gone as low as 6% on AC and noted that charging started almost straight away then paused before starting in the normal time slot. I assumed that this was to recover the battery back to a specific level first.

DC charging produces more heat so it’s likely that the BMS limits the current during the charge cycle to protect the battery at such a low state of charge.

It doesn’t seem good though that the available power has dropped so significantly and hopefully Mini will come up with an answer for this so be interesting to see how this goes.
 

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Discussion Starter · #3 ·
Interesting, I’ve done a 350mile trip in one day at mostly motorway speeds with four back to back DC rapid charges. All using 50kWh or higher charges and not noticed any issues with either charge speed or drops in power. There were differences in charge time and and power output which I assume were down to external temperature and battery temperature but nothing that really made a stop longer than 25 minutes. These charges were typically from 13% to 85% though so not as low as 2%. I’ve only gone as low as 6% on AC and noted that charging started almost straight away then paused before starting in the normal time slot. I assumed that this was to recover the battery back to a specific level first.

DC charging produces more heat so it’s likely that the BMS limits the current during the charge cycle to protect the battery at such a low state of charge.

It doesn’t seem good though that the available power has dropped so significantly and hopefully Mini will come up with an answer for this so be interesting to see how this goes.
Thanks for your feedback. Good to hear that you've done back to back charging and it worked well. We've done multiple DC charges in the range of 15-70% which took over an hour to charge. The 2+hr wait for the DC charge was the extreme example. Pretty embarrassing and frustrating too when there's a queue to charge. The car has failed since week one and looking back, we thought it was fortunate that we took a long drive, just waiting to have an answer for the fault. One has to wonder how many MINI Electrics might be doing what our vehicle is doing without doing a long drive and charge.
 

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What is the ambient temperature where you are? I ask the question because you should not be seeing this kind of behaviour unless the battery was extremely hot. If the dealer doesn't have an answer, have you tried contacting Mini customer services?
 

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Not every DCFC is rated the same, for example one of the free ones nearby is rated at 25 kW but I’ve never been able to draw at more than 22 kW from it. The car will draw based on a number of variables in order to optimise the health of the battery, usually only agreeing to take the DC fast charger’s maximum rate (up to 50 kW) in a very narrow set of conditions. These include current charge level, battery and ambient temperature, and so on. I’ve noticed that my car won’t draw at 45-50 kW if it’s above 23° out and the battery is outside a 40-80% state of charge. The system rolls off the charge rate above 80% — just like current iPhones do when plugged in overnight. Here’s a link to an InsideEVs article which highlights the SE’s DCFC rate and features the following curve:

Slope Rectangle Plot Font Parallel


All that said, it’s also possible the something onboard is farked, but it’s unlikely because the KLE (Komfortladeelektronik) isn’t involved in DC fast charging.
 

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Never seen a display like that.
How does it drive with only one yellow bar ? I've never had less than all of them up to 100% irrespective of % charge or outside temperature.
Only used DC charging a few times and always at the same place - the only "beyond range" trips I make are to the airport to drop or collect Anna and I only ever need a "top-up" there not a full charge, never had an issue with it.The slow down above 80% is obvious, I tried it one time I was there just to see.
 

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Yeah, something is going on with your car, OP.

End of august we had ambient temperatures between 100F - 110F (~43C) and I did multiple 60-80 mile highway trips with no degradation of charging or power availability. In the provided screen shot, the car is showing the lowest available power delivery even as you have 100% SoC.

I'd start with simple checks yourself - is there anything blocking the grille (plastic bags or debris), are the active shutters stuck closed? Things of that nature. But you should be having this sorted by the Mini service department. It's a new car with 6k KM on it - this should be something they are able to remedy and troubleshoot.
 

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This sound like a thermal issue. If you have access to an OBD adaptor, try the 'electrified' app. It can read battery temperature. I can't done a fast charge yet, so don't know what temps the battery should show.
Does the AC work? It should be downright icy on max. AC and battery share a system.
 

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'electrified' app is android only.
I have tried "car scanner" but not a fan of it, needs tons of customization.
I have tried to find an app for the ios that shows charging data such as voltage/amps/power/etc. but failed.
With 1 bar showing you are lucky the car starts, zero bars and it will not start.
I imagine driving with 1 bar must be like limp-home mode (never had less than full bars).
 

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Thank you, installed, have not tried it yet but it is exactly what I was looking for.
If you dig in, in the MINI app you can see the charging cap in amps and then you check the charging point/cable you are charging from (should be labeled - to see if 1ph or 3ph).
For example I was charging at a public charging point (cable was rated 20A 3ph) so I knew it was a 11kW (16A, 3ph) charger.
However MINI stated 8A cap (I have set to full speed) which meant 5.5kW, also its time to full charge equaled 5.5kW if you did the math, meaning charging point was internally capped to 50%
Why can't it just display the power it is charging at, are all EVs this cryptic?

Has anyone (apart from the OP) managed to get the ePower to 1 bar? I trust it would take some hammering (illegal speeds or track driving) under hot conditions and then plugging it into a DC charger?
Is it possible to get a loaner car from the dealer and see the difference in behavior? (I am guessing MINI EVs loaners are rare/inexistent)
 

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Discussion Starter · #17 ·
What is the ambient temperature where you are? I ask the question because you should not be seeing this kind of behaviour unless the battery was extremely hot. If the dealer doesn't have an answer, have you tried contacting Mini customer services?
It's winter/spring here in Canberra/Australia ... so pretty mild compared to European and North American winters. Have been updated that it might be a battery cooling problem which stops the battery from charging at higher speed. Pretty nervous and disappointing about having a brand new MINI being in service for over 3 weeks. Seems to be a pretty rare situation when searching online. Patiently waiting for MINI/BMW's solution.
 

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Discussion Starter · #18 ·
Not every DCFC is rated the same, for example one of the free ones nearby is rated at 25 kW but I’ve never been able to draw at more than 22 kW from it. The car will draw based on a number of variables in order to optimise the health of the battery, usually only agreeing to take the DC fast charger’s maximum rate (up to 50 kW) in a very narrow set of conditions. These include current charge level, battery and ambient temperature, and so on. I’ve noticed that my car won’t draw at 45-50 kW if it’s above 23° out and the battery is outside a 40-80% state of charge. The system rolls off the charge rate above 80% — just like current iPhones do when plugged in overnight. Here’s a link to an InsideEVs article which highlights the SE’s DCFC rate and features the following curve:

View attachment 80768

All that said, it’s also possible the something onboard is farked, but it’s unlikely because the KLE (Komfortladeelektronik) isn’t involved in DC fast charging.
We've actually carried this chart with us since it faulted on the first week we had the car. I understand that subsequent charges might be a little slow but not like 2.5hr for a DC full charge. The local MINI/BMW is trying to tell me that the car is not designed to drive long distance, but I said if the car can't drive 300km and charging comfortably on a winter's day, I hate to think how the battery charge will perform in summer ... Australian summer too!
 

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Discussion Starter · #19 ·
Never seen a display like that.
How does it drive with only one yellow bar ? I've never had less than all of them up to 100% irrespective of % charge or outside temperature.
Only used DC charging a few times and always at the same place - the only "beyond range" trips I make are to the airport to drop or collect Anna and I only ever need a "top-up" there not a full charge, never had an issue with it.The slow down above 80% is obvious, I tried it one time I was there just to see.
Good to know in some ways that you've not experienced it. We were told the power drop is possible if the battery is too warm. It happened to the MINI when we were on the freeway, we floored the car and it couldn't keep up at 80km/h.
 
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