[aaaaaaaaaz]

Hello,

I have used a few Chargepoint public chargers at different locations with stated power of 6.2kw-6.8kw. I am consistently getting only 5.73kw charging speed (reported on Chargepoint app, dosen't matter if battery is empty or up to 90%). I have AC charging current limit set to OFF.

I have been driving 2 different rental Wrangler 4xe for a few weeks, and for that car I always gets nearly the full chargepoint stated rate (>6.2kw) at the same set of chargers.

Wondering why X5 50e cannot draw the full available power, as it is capable of drawing 7.4kw on paper.

[eelnoraa]

How about at home? Does it ever change at 7.4 anywhere?

[aaaaaaaaaz]

Originally Posted by eelnoraa

How about at home? Does it ever change at 7.4 anywhere?

I do not have home L2 charger... I simply used the turbocord on 110v for now.

Is there a way to see exact charging speed thru BMW or myBMW app? There seems not to be one other than the "bar" thing on dashboard which rounds to nearest integer only

[eelnoraa]

I think in 45e, the car shows the charging current while it is charging. I can verify that tonight.

Edited. The car show the max negotiated current setting, but not the instantaneous current

[nZtiZia]

Originally Posted by alanzyy

Hello,

I have used a few Chargepoint public chargers at different locations with stated power of 6.2kw-6.8kw. I am consistently getting only 5.73kw charging speed (reported on Chargepoint app, dosen't matter if battery is empty or up to 90%). I have AC charging current limit set to OFF.

I have been driving 2 different rental Wrangler 4xe for a few weeks, and for that car I always gets nearly the full chargepoint stated rate (>6.2kw) at the same set of chargers.

Wondering why X5 50e cannot draw the full available power, as it is capable of drawing 7.4kw on paper.

there are many ways to unravel this, so it will involve more meticulous data gathering on your part if we really want to understand why. it all stems from the formula
Voltage • Amps = Watts
1) what max charging rate did you set on the 50e?

2) while the ChargePoints are rated between 6.2-6.8kW, what are their rated max amps?

possible explanation #1) if their input voltage is 240V, and your 50e charger is only going to 5.73kW, then
5730W divided by 240V = 23.9A
this shows the charging rate in your 50e may be set too low.

possible explanation #2) at 240V, their max charging rates are ~26-28A as shown by
6200W or 6800W divided by 240V = 25.8-28.3A
knowing this, it still seems likely the charging rate in your 50e is set too low because
23.9A • 240V = 5736W (close enough)

possible explanation #3) the input voltage of those ChargePoints is less than 240V and your 50e charging rate is set too low

if you in fact did set the charging rate in your 50e to 32A, that coupled with its 7.4kW charger and (assuming) 240V input should allow you to get the stated 6.2-6.8kW from those ChargePoints because
32A • 240V = 7680W or 7.68kW (well, limited to 7.4kW)

we can play the numbers game all day to show possible explanations, but it’s best to get concrete numbers if you can. I would start at the charging rate setting in your 50e. please report back.

Originally Posted by alanzyy

. . .
Is there a way to see exact charging speed thru BMW or myBMW app? There seems not to be one other than the "bar" thing on dashboard which rounds to nearest integer only

see below

Originally Posted by eelnoraa

I think in 45e, the car shows the charging current while it is charging. I can verify that tonight.

Edited. The car show the max negotiated current setting, but not the instantaneous current

correction. the MyBMW app shows the actual charging rate while charging (circled in yellow below). yes, this screenshot was taken after my charging session was complete, but before anyone tries to call me out, this number changes throughout the charging session (albeit delayed due to the server). for example on my 45e, due to the load sharing program between both of my JuiceBox EVSE, the charging rate starts and reflects 7A then increases to 15A less than a minute later. (it only goes to 15A because my input voltage is 247V.)
3700W divided by 247V = 15A

[eelnoraa]

Commercial electric supply in CA is 3 phase with each phase has 208V. Typically ChargePoint in the area is 32A. So 208 x 32 =6600W. So what it indicates is correct. But why only 5.7KW is drawn by OP is hard to say. Maybe try a few other L2 evse and see if this is consistent?

[nZtiZia]

the signs then seem to point that his 50e charging rate may be set to less than 32A as I suspected above though I could still be wrong.

5730W divided by 208V = ~28A
alanzyy check your 50e charging rate

[aaaaaaaaaz]

It is set to OFF (upon delivery from dealership) - should I turn it on?


I tried target, ones at my work places (few different campus). I tried an exact same charger on Jeep it was reporting 6.1 but on bmw it was reporting 5.7 on ChargePoint app.

[nZtiZia]

Originally Posted by alanzyy

It is set to OFF (upon delivery from dealership) - should I turn it on?


I tried target, ones at my work places (few different campus). I tried an exact same charger on Jeep it was reporting 6.1 but on bmw it was reporting 5.7 on ChargePoint app.

OFF or Unrestricted as seen on the screenshot? I’m not familiar with this setting on the 50e but play with it to see what happens

[jad03060]

The logic in the 50e is not the same as on the 45e. In the 45e, the iDrive menu that can limit the current (in the USA) only works on a level 1 device, not a level 2 device. The different modes in Europe are defined differently. From reading the 50e manual, it appears that the iDrive current limiting menu MAY work on both level 1 and 2 devices, but I don't have one to be able to check. The other thing the 50e adds that the 45e doesn't have, is the ability to set an upper charge level percentage...if you leave a 45e plugged in, it will always charge to full then disconnect the EVSE's power input.

Note that this time of year, as the temperatures have been setting record highs, the vehicle MIGHT slow down the maximum charge rate to keep the battery temperature within a safe range.

It's also possible, but I've not seen this, that the EVSE might be smart enough to adjust its pilot signal that would limit the maximum power available, based on what the utility may be requesting.

[aaaaaaaaaz]

Tested again today.

Temperature - between 60-70F
Chargepoint stated power: 6.3kw
Tesla model 3 - chargepoint reports 6.2kw
X5 50e (at 46% charge) - chargepoint reports 5.6-5.7 kw

[KT_OH]

Originally Posted by alanzyy

Tested again today.

Temperature - between 60-70F
Chargepoint stated power: 6.3kw
Tesla model 3 - chargepoint reports 6.2kw
X5 50e (at 46% charge) - chargepoint reports 5.6-5.7 kw

Depending on where I am working, I have access to chargepoint to recharge my 50e for commute home. I looked in chargepoint app, my charging history shows the same for chargepoint 5.6/5.7 kw.

I confirmed my setting in iDrive and App shows 32A max setting is enabled so that should not be a limiting factor. At home, I have a Grizzl e. It does not have wifi, etc, so I can't access exact history/data from it. I did look at comparable charges on the BMW app (i.e. ~18kWh) takes 2 hrs 44 mins at home and 3 hrs 23 mins on the chargepoint. Not precise, but that difference indicates to me that for whatever reason, the chargepoint is different for some reason.

[KT_OH]

Originally Posted by eelnoraa

How about at home? Does it ever change at 7.4 anywhere?

I added a response above to a separate post. At home with my L2 vs chargepoint at work. My charge times at home reflect 7.4 (~18kWh in ~2 hrs 45 mins)

[jkramerXXX7]

I have L2 charge point at home and work. It charges at 7.4 and take about 3.5 hours for full charge from empty.

[nZtiZia]

Originally Posted by alanzyy

Tested again today.
Temperature - between 60-70F
Chargepoint stated power: 6.3kw
Tesla model 3 - chargepoint reports 6.2kw
X5 50e (at 46% charge) - chargepoint reports 5.6-5.7 kw

I’m at a loss in your case, bruh. if those public ChargePoints are charging at their max for the Tesla and Jeep, they should for your 50e. even with its charge rate set to 32A as KT_OH did, he confirmed 5.7kW using a public ChargePoint

[KT_OH]

Originally Posted by nZtiZia

I’m at a loss in your case, bruh. if those public ChargePoints are charging at their max for the Tesla and Jeep, they should for your 50e. even with its charge rate set to 32A as KT_OH did, he confirmed 5.7kW using a public ChargePoint

Agree - the only other difference is the chargepoint public charger I use is a dual charger. It does not make sense how it would impact it if I am the only one using the charger, or the difference between vehicles noted above. I did look though and there was a time period when during one charge when someone was using the other charger. I was getting 5.6kW when alone and ~2.9kW when load was shared. The drop was close to 50%, but slightly less. Is it something in the logic of the dual chargepoints and their interaction with the BMW? Does not make sense, but scratching my head for explanations.

[eelnoraa]

Originally Posted by KT_OH

I added a response above to a separate post. At home with my L2 vs chargepoint at work. My charge times at home reflect 7.4 (~18kWh in ~2 hrs 45 mins)

Wait, 18kWh / 2.75hr = 6.5kW, right? How is that 7.4kW?

[eelnoraa]

Originally Posted by jkramerXXX7

I have L2 charge point at home and work. It charges at 7.4 and take about 3.5 hours for full charge from empty.

Again, I don’t get the math here. 50e usable capability is 20kWh. Assuming you have charging efficiency of 85%, so to get 20kWh into battery, you consumed 23kWh. That divided by 3.5hr, it is 6.6kW. How is that 7.4??

6.6 makes sense at commercial locations due to the 208V 3-phase supply. At home, we should have 240V. So should be 7.4kW. Fully charged 20kWh capacity should take 3 hours. At least the math works like this. I wonder anyone with 50r with energy monitor device can share actual current drawn.

[KT_OH]

Originally Posted by eelnoraa

Again, I don’t get the math here. 50e usable capability is 20kWh. Assuming you have charging efficiency of 85%, so to get 20kWh into battery, you consumed 23kWh. That divided by 3.5hr, it is 6.6kW. How is that 7.4??

6.6 makes sense at commercial locations due to the 208V 3-phase supply. At home, we should have 240V. So should be 7.4kW. Fully charged 20kWh capacity should take 3 hours. At least the math works like this. I wonder anyone with 50r with energy monitor device can share actual current drawn.

I just completed a full charge this morning. Came home last night at -- on the battery gauge. I completed the charge in 3 hrs and 4 mins.

[eelnoraa]

Originally Posted by nZtiZia

the signs then seem to point that his 50e charging rate may be set to less than 32A as I suspected above though I could still be wrong.

5730W divided by 208V = ~28A
alanzyy check your 50e charging rate

This is my observation as well. I think quite a few piece of info is pointing to 28A charging instead of 32A.

[calbears]

A little FYI, but you can get a last 30 day history of charging sessions with lots of data in the myBMW app and then share it to yourself in an Excel file

[jad03060]

In the USA, the nominal voltage supplied to a home is 240vac. FWIW, mine typically is closer to 248vac. Many commercial units are fed with 208vac, and all of those can have a +/-10% or so, so could be lower or higher than the nominal value...then, you have the potential of a brownout.

Since power=volts*amps, lowering the voltage available has a direct effect on the number of watts supplied. My guess is also that the power supply in the X5 is a bit less efficient when fed with a lower voltage...I know it was true with the i3 I had...the difference between level 1 and level 2 on that one was about 10% worse with level 1 than level 2.