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      01-25-2021, 12:32 PM   #1
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45e Charging Questions

I just got my 45e recently and have a few questions about charging.

1) The instrument cluster and the BMW Connected app show different electric range miles while charging. Usually the app shows 1 or 2 miles more.

2) The estimated time of full charge completion is several hours off and again there is a few minute difference between what the car and the app show. The time usually changes by a few minutes back and forth. Once it actually jumped back by a few hours to show the proper estimated completion time but the last time I charged it kept showing 4:20 pm and it actually finished around 2:00 pm as I was estimating.

3) How long does it take for people to charge using a 110v outlet at 16 amps? Mathematically it should be around 13.7 hours. Mine takes 14,5 hours.

Is anyone experiencing any of the above issues?

Last edited by javapro; 04-12-2022 at 11:59 PM..
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      01-25-2021, 12:53 PM   #2
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I just picked my car up on Saturday and have not been able to even get mine to a full charge yet. On a 110 outlet, it is a slow go.
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      01-25-2021, 01:05 PM   #3
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Originally Posted by PREDATOR 007 View Post
I just picked my car up on Saturday and have not been able to even get mine to a full charge yet. On a 110 outlet, it is a slow go.
Don’t use the charging cable supplied with the car. It’s limited to 10 amps and the car takes about 24 hours to charge with it. I got this 16 amp charging cable and it takes around 14.5 hours with it: https://www.amazon.com/dp/B08HHBDQ88...ing=UTF8&psc=1
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      01-25-2021, 01:17 PM   #4
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It will charge in 5 hours will a Level 2 charger. Well worth the expense of having one installed
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      01-25-2021, 01:27 PM   #5
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Something like this?

https://www.amazon.com/ChargePoint-H.../dp/B07WNXTHNW

ChargePoint Home Flex Electric Vehicle (EV) Charger upto 50 Amp, 240V, Level 2 WiFi Enabled EVSE, UL Listed, Energy Star, NEMA 6-50 Plug or Hardwired, Indoor/Outdoor, 23-Foot Cable
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      01-25-2021, 01:31 PM   #6
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Originally Posted by PREDATOR 007 View Post
Something like this?

https://www.amazon.com/ChargePoint-H.../dp/B07WNXTHNW

ChargePoint Home Flex Electric Vehicle (EV) Charger upto 50 Amp, 240V, Level 2 WiFi Enabled EVSE, UL Listed, Energy Star, NEMA 6-50 Plug or Hardwired, Indoor/Outdoor, 23-Foot Cable

That's the one I have. Works great
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      01-25-2021, 02:04 PM   #7
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A few things to keep in mind
- regardless of the size of the EVSE, if it's at least 16A, the X5 will be charging at its maximum rate...more doesn't buy you anything at least with this vehicle
- There's always some conversion losses in heat, cooling fans, etc., and changing from ACV to DCV, so it will take more watts in than what ends up being stored
- a level 2 device (240vac) will be more efficient than a level 1 device (120vac)
- since power = volts * amps, a 16A, 240vac device will charge twice as fast as a 16A, 120vac device, plus a bit more because of the above
- it seems that arbitrarily, sometimes, the vehicle will switch to 6A maximum charging rate, and that will slow charging down arbitrarily. Eventually, that bug should be fixed! In the meantime, it's a good idea to verify what your iDrive menu is set to, or you may be surprised that it takes so long. The only reason to set it lower than max (16A), is if the EVSE has to share the branch circuit with something else, and you don't want to potentially pop the circuit breaker...you won't hurt the X5 or the EVSE, just your patience.
- if the vehicle is really cold or extremely hot, the charging rate will be slower
- the actual charging rate slows down as the state of charge (SOC) gets closer to 100%, so the last 10% or so will be slower than the first 90%
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      01-25-2021, 06:48 PM   #8
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Quote:
Originally Posted by jad03060 View Post
A few things to keep in mind
- regardless of the size of the EVSE, if it's at least 16A, the X5 will be charging at its maximum rate...more doesn't buy you anything at least with this vehicle
- There's always some conversion losses in heat, cooling fans, etc., and changing from ACV to DCV, so it will take more watts in than what ends up being stored
- a level 2 device (240vac) will be more efficient than a level 1 device (120vac)
- since power = volts * amps, a 16A, 240vac device will charge twice as fast as a 16A, 120vac device, plus a bit more because of the above
- it seems that arbitrarily, sometimes, the vehicle will switch to 6A maximum charging rate, and that will slow charging down arbitrarily. Eventually, that bug should be fixed! In the meantime, it's a good idea to verify what your iDrive menu is set to, or you may be surprised that it takes so long. The only reason to set it lower than max (16A), is if the EVSE has to share the branch circuit with something else, and you don't want to potentially pop the circuit breaker...you won't hurt the X5 or the EVSE, just your patience.
- if the vehicle is really cold or extremely hot, the charging rate will be slower
- the actual charging rate slows down as the state of charge (SOC) gets closer to 100%, so the last 10% or so will be slower than the first 90%
Yes, I know there is some watt loss and that's why I wanted to know how long does it take for people to charge at 120v/16 amps. My cousin claims that his 45e charges in 13 hours using a regular 20 amp outlet. My car is always showing "MAX 16 amp" when charging even when I tried to set the max amps in the settings to 15 or 13. When I used the 10 amp cable provided by BMW it did say that it was charging at 10 amps. Very weird.
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      01-25-2021, 07:24 PM   #9
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The vehicle will never (if it's working right) try to pull more amps than the EVSE says it has in the pilot signal it sends out. The setting in the vehicle is only there to help prevent overloading of a shared circuit the EVSE might be trying to share with say your garage door opener, or a saw you want to use in the garage. Otherwise, leave it at maximum.

After a long, aggressive drive on a hot summer day, the battery pack may be quite warm, and the cooling will eat up more of the input power when recharging to help preserve it. As would parking out in the open over asphalt that has been cooking in the sun all day, potentially increasing the cooling load maybe before the charging can even begin. So, charging efficiency is a temperature and EVSE limited situation.

At 120vac, it appears to be in the low 90% efficiency range while 240vac is closer to 95%, so you lose some when supplying it with the lower voltage input, disregarding any cooling that may be required in the process.
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      01-25-2021, 11:08 PM   #10
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Quote:
Originally Posted by jad03060 View Post
The vehicle will never (if it's working right) try to pull more amps than the EVSE says it has in the pilot signal it sends out. The setting in the vehicle is only there to help prevent overloading of a shared circuit the EVSE might be trying to share with say your garage door opener, or a saw you want to use in the garage. Otherwise, leave it at maximum.

After a long, aggressive drive on a hot summer day, the battery pack may be quite warm, and the cooling will eat up more of the input power when recharging to help preserve it. As would parking out in the open over asphalt that has been cooking in the sun all day, potentially increasing the cooling load maybe before the charging can even begin. So, charging efficiency is a temperature and EVSE limited situation.

At 120vac, it appears to be in the low 90% efficiency range while 240vac is closer to 95%, so you lose some when supplying it with the lower voltage input, disregarding any cooling that may be required in the process.
All I am using is a 16 amp 120v charging cable that I plug straight into an outlet so only the cable which has a built-in amp regulator or whatever you call it can send a pilot signal. My point is that I set the car to draw 13 amps and it’s still showing that it’s drawing 16 amps while charging.

Can you or someone answer my questions #1 and #2?
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      01-26-2021, 12:33 PM   #11
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Does your EVSE have a display that shows how many amps are being drawn from it? The vehicle doesn't that I'm aware of. The menu setting SHOULD limit it to the value you set, but never more than what the device announces that it has (it's a PWM signal that has to be interpreted by the vehicle).

IOW, if the menu is set to a max of 13A, and the device says it has 16A, the maximum draw should be limited to 13A by the vehicle. FWIW, the EVSE is a fancy on/off switch that essentially, just passes power through it. All of the smarts and conversion is done inside of the vehicle. To run the logic board and lights on a typical EVSE, it might draw 1-3W or so just for itself. When it activates its power contactor, it will probably pull a few more watts for itself.
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      01-26-2021, 12:45 PM   #12
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Quote:
Originally Posted by jad03060 View Post
Does your EVSE have a display that shows how many amps are being drawn from it? The vehicle doesn't that I'm aware of. The menu setting SHOULD limit it to the value you set, but never more than what the device announces that it has (it's a PWM signal that has to be interpreted by the vehicle).

IOW, if the menu is set to a max of 13A, and the device says it has 16A, the maximum draw should be limited to 13A by the vehicle. FWIW, the EVSE is a fancy on/off switch that essentially, just passes power through it. All of the smarts and conversion is done inside of the vehicle. To run the logic board and lights on a typical EVSE, it might draw 1-3W or so just for itself. When it activates its power contactor, it will probably pull a few more watts for itself.
My charging cable just has power, connected, charging, and fault indicators. The car definitely shows how many amps it's drawing. With my new 16 amp cable it shows 16 amps and with the one supplied by BMW it was showing 10 amps.
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      01-27-2021, 12:13 AM   #13
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Quote:
Originally Posted by javapro View Post
1) The instrument cluster and the BMW Connected app show different electric range miles while charging. Usually the app shows 1 or 2 miles more.

2) The estimated time of full charge completion is several hours off and again there is a few minute difference between what the car and the app show. The time usually changes by a few minutes back and forth. Once it actually jumped back by a few hours to show the proper estimated completion time but the last time I charged it kept showing 4:20 pm and it actually finished around 2:00 pm as I was estimating.

3) How long does it take for people to charge using a 100 v outlet at 16 amps? Mathematically it should be around 13.7 hours. Mine takes 14,5 hours.

Is anyone experiencing any of the above issues?
#1) Yes, I have noticed some minor discrepancies between what the app shows for range and what the car shows when I get in and start driving. The app is usually optimistic by 1-2 miles. (Highest I have seen is 41 mile range on the app, I don't think the car has ever shown more than 38 or 39.)

#2) I don't usually pay much attention to the estimated charging time, but on the occasions I have looked, it is always a bit off from reality. I don't know why, and haven't really cared enough to look into it.

#3) I don't normally charge off a 110V outlet, as I use the 220V circuit from my clothes dryer with a Level2 charger that I started using with my F15 40e back in December of 2019. I do have a Level1/Level2 portable charger that I use at our ski condo on a 110V outlet, but haven't really paid close attention to charging time. I do know it took A LOT LONGER than the 4-5 hours of charging on my L2 charger on 220V.

FWIW, I have been using the ChargePoint Home Flex Level2 charger for a little over a year and have been pretty happy with it. I did recently start having an issue with the wifi and BT connection (it basically stopped all communication), but after contacting ChargePoint support and giving them some info about the problem and my unit, they shipped a new one out today that should arrive on Thursday. Very good support experience thus far. (I received this charger at no cost as part of a product evaluation program, but would very seriously consider purchasing this charger at the current ~$650 price if I needed to purchase another.)
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      01-27-2021, 09:31 AM   #14
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Quote:
Originally Posted by rawskyb View Post

FWIW, I have been using the ChargePoint Home Flex Level2 charger for a little over a year and have been pretty happy with it. I did recently start having an issue with the wifi and BT connection (it basically stopped all communication), but after contacting ChargePoint support and giving them some info about the problem and my unit, they shipped a new one out today that should arrive on Thursday. Very good support experience thus far. (I received this charger at no cost as part of a product evaluation program, but would very seriously consider purchasing this charger at the current ~$650 price if I needed to purchase another.)

I also have this charger and it's been great. I just get out of the X5 and plug it in. It charges flawlessly at 16 amps every time. I've never had the X5 reset to 6 amps as many others have. Highly recommended charger
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      01-27-2021, 11:42 AM   #15
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Quote:
Originally Posted by Spencer518 View Post
I've never had the X5 reset to 6 amps as many others have. Highly recommended charger
Same here - my dealer set my 45e to 16A charging when I took delivery back in October and I have never once had a problem charging at 16A/220V with the Chargepoint. No reset to 6A or anything like that.
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      02-02-2021, 10:28 AM   #16
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Quote:
Originally Posted by javapro View Post
I just got my 45e recently and have a few questions about charging.

1) The instrument cluster and the BMW Connected app show different electric range miles while charging. Usually the app shows 1 or 2 miles more.

2) The estimated time of full charge completion is several hours off and again there is a few minute difference between what the car and the app show. The time usually changes by a few minutes back and forth. Once it actually jumped back by a few hours to show the proper estimated completion time but the last time I charged it kept showing 4:20 pm and it actually finished around 2:00 pm as I was estimating.

3) How long does it take for people to charge using a 100 v outlet at 16 amps? Mathematically it should be around 13.7 hours. Mine takes 14,5 hours.

Is anyone experiencing any of the above issues?
With Software 11/2020 45 I have seen a larger discrepancy between the app and the vehicle for range. Right now my car is showing 33 but my app is show 23. And when I go start the car up, the app gets updated with the range per the car display.
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      02-02-2021, 05:59 PM   #17
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The app will indicate the last time that it was updated...that could easily be quite awhile in between them. So, the vehicle itself will always show what it thinks is true, but it does not constantly update that information to the server feeding the app...the app does not directly talk to the vehicle, except through the server.

IOW, it is not uncommon for the app and the vehicle to show different things.
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      03-17-2021, 09:30 PM   #18
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Lots of great info in this thread! I’m starting the process of getting a L2 charger installed in my garage for a 45e delivery date mid April.

Question... if I install a dedicated 220 50amp circuit (yes, overkill but future proofing) and can achieve maximum charging speeds, a FULL charge would take around 5-6 hours? But from what I’ve read, the last 10-20% takes a long time... so how quickly can you get to 80%? That could still be very useful around town, if it was only a couple hours? Would that cause any long term damage to the batteries to only charge to 70-80% on a routine basis?
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      03-18-2021, 06:17 AM   #19
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From Empty to Full, mine takes around 7hrs.

Level 2 charger, at 16amp.
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      03-18-2021, 06:19 AM   #20
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I have the Chargepointe charger with a 50amp breaker installed. From empty it takes about 5 hours.
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      03-18-2021, 07:05 AM   #21
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Wow, 5 hours is pretty fast, all things considered. I guess I was wondering if there are any benefit for charging it while traveling to get some charge. Would an hour charge, break for lunch on a long a trip, have any benefit? If it take longer to charge the last 20%, does it charge the first 20% super fast? Or is it S shaped, where the first 20% is slow and then the bulk of the charging occurs during the middle of the time band? Being the geek that I am, I will probably run some tests, charging the charge at different time intervals to see if I can find a pattern, assuming no one else is this crazy. I’ll be sure to post my results. See attached crude charts showing what I’m taking about. I know it isn’t options A or B, just curious if owners think it is option B or C.
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      03-18-2021, 07:52 AM   #22
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Quote:
Originally Posted by moholland View Post
Wow, 5 hours is pretty fast, all things considered. I guess I was wondering if there are any benefit for charging it while traveling to get some charge. Would an hour charge, break for lunch on a long a trip, have any benefit? If it take longer to charge the last 20%, does it charge the first 20% super fast? Or is it S shaped, where the first 20% is slow and then the bulk of the charging occurs during the middle of the time band? Being the geek that I am, I will probably run some tests, charging the charge at different time intervals to see if I can find a pattern, assuming no one else is this crazy. I’ll be sure to post my results. See attached crude charts showing what I’m taking about. I know it isn’t options A or B, just curious if owners think it is option B or C.
The problem with most public pay chargers is most charge by time connected, not kw. The ones that charge by time are not worth it because of the low charging rate and end up costing us more than gas.

Charging mine has been linear except once it hits the 100% reading. It can take an addition 20 minutes or so once it hits 100% and you can see the charge power draw drop for those last 20 minutes.

Oh, and just FYI, it takes about 19kw to go from 0 to 100% which is about a 2kw or 10% loss assuming the battery is only 17kw as BMW states.
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