[agorski]

Originally Posted by SkykingUSA

Did you notice what the maximum power was during that time? Did it ever get close to the 205 kW, or did it stay a little lower since you were already at 48% when you started?

According to the app it started at 148. Pretty much where it should be on the charging curve.

1 of the 4 units was down, and 2 others claimed to be up but wouldn’t work when tried, so I got the full benefit of a 350kw unit.

[Trevor G]

The charging process can be adapted to constraints such as the cost of electricity, available
current sources, or a low ambient temperature.
The vehicle controls the charging process in
such a way that the charging process is completed if possible at the departure time. A departure time must be set for this purpose.

Whenever I have plugged into an EA fast charger a departure/charge time is shown on the dash. The car is definitely charging at a rate to get me to 80% withing the 30 minute free charging window. The finish time and charging rate fluctuates to ensure I am at 80% within the 30 minutes. I am sure this is built in to the plug and charge system. I feel like my wife is charging my car, she knows...she always knows

[LVBMW]

Originally Posted by Trevor G

The charging process can be adapted to constraints such as the cost of electricity, available
current sources, or a low ambient temperature.
The vehicle controls the charging process in
such a way that the charging process is completed if possible at the departure time. A departure time must be set for this purpose.

Whenever I have plugged into an EA fast charger a departure/charge time is shown on the dash. The car is definitely charging at a rate to get me to 80% withing the 30 minute free charging window. The finish time and charging rate fluctuates to ensure I am at 80% within the 30 minutes. I am sure this is built in to the plug and charge system. I feel like my wife is charging my car, she knows...she always knows

The set departure time is related to AC charging not DC charging. The car does manage charging as best it can based on its charging curve (e.g., trying to get a higher KWH rate initially which then gradually tapers down), but this has nothing to do with completing the charge within the "free charging window." I have charged at EA and almost never reach my charging target within 30 minutes. I think it's great that you have been able to do so, but this is just really good luck. The 30 minute free charging is not related to plug and charge, and most countries do not even get the 30 minute free charging offer. There are definitely circumstances (e.g., DC charging infrastructure) where it will just be impossible to hit the target within 30 minutes. There are tons and tons of reports on the iX forum about this, and this is how people discovered that you can disconnect at 30 minutes and plug in again to continue the charge and start another 30 minute free session (the one hour waiting period is not currently being enforced).

[Trevor G]

My car displays a departure time after plugging into a DC charger. It is very strange. I will do the 30 to 90 charge on my way home tonight at a 350kw charger so we can put this to bed

[LVBMW]

Originally Posted by Trevor G

My car displays a departure time after plugging into a DC charger. It is very strange. I will do the 30 to 90 charge on my way home tonight at a 350kw charger so we can put this to bed

For sure; it will display a departure time if you've set one (see the OP's set departure time in their photo which is for the following morning even though they're charging in the afternoon), but it's not applying this for DC charging. With all due respect, your theory just doesn't make sense for many reasons not the least of which is that sometimes the charging infrastructure just makes it impossible to hit the target in 30 minutes. And, many (most) countries do not get the 30 minute charging offer. So, there is really no way the car could "know" about this. Plug and charge just links the car and a charging contract together so it can communicate who you are to the charger without having to use an app, etc. I mean, if you happen to be at a fantastic DC charger in optimal conditions would the car reduce the power just so you hit your target right at 30 minutes? That wouldn't make sense either. It's just trying to get you charged as fast as possible based on various constraints. As I said, I almost never hit the target within 30 minutes. But, I am glad that you have been!

[Trevor G]

This is itching at me because I have always been charged to 80 from various start levels within 28 to 30 minutes. Only thing I can think of is the battery management keeping the kw as low as possible to reach target. I have seen it go from 75kw up to 150kw down to 60kw then back up to 80kw. When the charge finish time goes beyond the 30 minutes time frame it speeds up. When it gets to about 2 minutes early it slows down. I am hoping this is not the case because I would like to just charge and hit the road as quickly as possible. Tonight I am hopping I can finally scratch that itch

[Scrapula]

The car can’t know about the charging limit, but the My BMW app can. There is a 30 minute EA card in my phone wallet that activates the charger with no EA account. The app in the wallet sends the activation to the MyBMW app which communicates with the car.

It’s feasible that it tries to max at 30 minutes. The app talks to my car to send a destination, or start conditioning, etc

[LVBMW]

Originally Posted by Scrapula

The car can’t know about the charging limit, but the My BMW app can. There is a 30 minute EA card in my phone wallet that activates the charger with no EA account. The app in the wallet sends the activation to the MyBMW app which communicates with the car.

It’s feasible that it tries to max at 30 minutes. The app talks to my car to send a destination, or start conditioning, etc

If you're using plug and charge as many are moving to, there will be no use of the BMW app or Apple wallet. I use only plug and charge, and I have never reached my target within 30 minutes (sadly).

[Trevor G]

And the verdict is...... 30% to 90% at a 350 KW fast charger took 28 minutes. Hit 190kw peak then dropped off more and more as I got closer to 90%. I can say with certainty that it was purely coincidental with the 30 minutes getting to my mark. 40% to 80% at a 150kw charger took 37 minutes. I did the unplug and restart session trick and all went smooth and no extra charges. So it is put to bed now LVBMW

[LVBMW]

Originally Posted by Trevor G

And the verdict is...... 30% to 90% at a 350 KW fast charger took 28 minutes. Hit 190kw peak then dropped off more and more as I got closer to 90%. I can say with certainty that it was purely coincidental with the 30 minutes getting to my mark. 40% to 80% at a 150kw charger took 37 minutes. I did the unplug and restart session trick and all went smooth and no extra charges. So it is put to bed now LVBMW

Glad to hear it. You seem to have better EA experiences. The first one I tried yesterday (150 KW) said it was putting out “reduced power due to a software update” and wouldn’t put out more than 48. Had to drive to another location (another 150) where I barely peaked at around 88. I’m thinking these uneven EA experiences are why they haven’t enforced the one hour waiting period between charges.

[joshgarvey426]

I got the EA DC fast charge on Thursday just to try it out and confirm the charge without using an app would work. Started at around 38% and it got to about 72% limit in 15 minutes. That’s great..