Battery capacity question

[Shiraz8484]

This question is about battery capacity not range. I have a SR+ M3. My understanding is that the car has a 50KWh battery pack. If this is true, charging the battery to 100% and driving it down to 50% should use 25kWh KWh. Since the unit is a percentage not Kilometres, it should not matter how I drive etc. I tried doing this today by charging to 100% and driving. At 45% SOC, the car showed 19KWh used. Prorating this number to 100%, the battery capacity comes to only 35KWh. What am I missing here?

Also, ignore the range number in the image. My lifetime average is 180wh/km

 

[DMC-Orangeville]

This question is about battery capacity not range. I have a SR+ M3. My understanding is that the car has a 50KWh battery pack. If this is true, charging the battery to 100% and driving it down to 50% should use 25kWh KWh. Since the unit is a percentage not Kilometres, it should not matter how I drive etc. I tried doing this today by charging to 100% and driving. At 45% SOC, the car showed 19KWh used. Prorating this number to 100%, the battery capacity comes to only 35KWh. What am I missing here?

Also, ignore the range number in the image. My lifetime average is 180wh/kmView attachment 482635

A certain percentage of the battery is unusable to insure the battery is not completely discharged. It varies by battery size and technology. There have been a bunch of studies on this for older models. On mine - an 85 KWH battery, it's about 79 KWH usable.
Also, you will have some heating and vampire losses.

 

[Casmium]

I also noticed that the number seems to only climb while driving, so if you go to a drive in movie and run the heat while Parkes the whole time it doesn't add to the kwh used, same probably goes for preheating the battery, turning climate on before you get to the car etc.

 

[Shiraz8484]

I also noticed that the number seems to only climb while driving, so if you go to a drive in movie and run the heat while Parkes the whole time it doesn't add to the kwh used, same probably goes for preheating the battery, turning climate on before you get to the car etc.

These should all not matter as I am talking about percentage of battery (capacity) not range.

 

[Shiraz8484]

A certain percentage of the battery is unusable to insure the battery is not completely discharged. It varies by battery size and technology. There have been a bunch of studies on this for older models. On mine - an 85 KWH battery, it's about 79 KWH usable.
Also, you will have some heating and vampire losses.

Reading others posts, I see that 52kWh is the usable capacity.

 

[DMC-Orangeville]

Reading others posts, I see that 52kWh is the usable capacity.

?
50 KWH battery with 52KWH usable? The math doesn't seem to work here

Edit: I just read that the SR+ and SR are the same battery - 55KWH. SR is software locked at 8%. = 50KWH
So it's possible SR+ is 55KWH with losses at 52KWH

 

[Casmium]

These should all not matter as I am talking about percentage of battery (capacity) not range.

What I meant was, if you use 25% of the battery vehicle driving and another 25% while sitting in park watching Netflix with the heat on, the kwh used will only show 25%(12.5kwh used) even thought it will take 25 kwh to charge it back to where you started

 

[DMC-Orangeville]

Here's the link to the old 85 KWH battery. I was wrong at 79 for mine - it's 75.9KWH
Bricking protection at 3.9KWH
Zero mile protection at 5.1KWH
In other words it's that extra kick that lets those crazy folks get more range when they have 0% remaining

Real Usable Battery Capacity

Should be similar for Model 3

 

[DMC-Orangeville]

Check out this thread. Posted this year: Battery runs like 60kw instead of 75kw
Do a search on real battery capacity. There's tons of stuff on this

 

[TomLee]

This question is about battery capacity not range. I have a SR+ M3. My understanding is that the car has a 50KWh battery pack. If this is true, charging the battery to 100% and driving it down to 50% should use 25kWh KWh. Since the unit is a percentage not Kilometres, it should not matter how I drive etc. I tried doing this today by charging to 100% and driving. At 45% SOC, the car showed 19KWh used. Prorating this number to 100%, the battery capacity comes to only 35KWh. What am I missing here?

Also, ignore the range number in the image. My lifetime average is 180wh/kmView attachment 482635

Battery capacity is around 52.5kWh usable. Probably 2kWh reserve hidden for the normal user ‘cause 54.5kWh at EPA testing. 55% usage is around 28.8kWh . That minus 19kWh, which is around 10kWh, was your idle loss (vampire drain). See post here Vampire Drain? Simple way of checking it ...

 

[TomLee]

Check out this thread. Posted this year: Battery runs like 60kw instead of 75kw
Do a search on real battery capacity. There's tons of stuff on this

OP is having a SR+, not MR, LR, P3D or even MS. Battery capacity is different in different model.

 

[Shiraz8484]

Battery capacity is around 52.5kWh usable. Probably 2kWh reserve hidden for the normal user ‘cause 54.5kWh at EPA testing. 55% usage is around 28.8kWh . That minus 19kWh, which is around 10kWh, was your idle loss (vampire drain). See post here Vampire Drain? Simple way of checking it ...

Thanks! I used the stats app to see Kwh added from 65% state of charge to 90% Soc and it came out to 12.89KWh where as going from 90%-65% a day earlier was 10kwh. U less there are charging related losses, I think I see your theory working here because using the Kwh added number, the battery capacity comes to around 52kwh as it should br.