MX battery consumption question.

[Jillmark99]

I have never felt I get the proper charge or mileage out of my model X. I am hoping someone with more Tesla battery knowledge than me can help clarify if what my MX gets is correct or if I need to get the battery looked at. I performed a little test and tried to get as much info as possible to yield some accurate results. I would appreciate feedback on the below.


2016 MX 75D with approx 85,000kms

Charged with HPWC to 100% - 356kms (this seams low to me).

Car sat overnight in a warm 11 degree C garage. Car was still plugged into the HPWC.

I warmed up the car for about 15 minutes prior to departure using the app.

Left in morning with battery at 351kms.

Temp is 2 degrees C outside.

Drove 109.3kms, battery is now at 197kms. Approx 3/4 of the trip was county roads and 1/4 of the trip was city driving. Very little traffic.

Driving was in the dark with cabin at 23 degrees C.

Both front heated seats on for 1/2 the trip.

The car averaged 249wh/km and consumed 27.3kwh for the drive. This is based on the info on the MCU screen.

I did not use AP or cruise for this trip.

I have 20” wheels.

Is this normal? Car used 154kms for this trip?

2 weeks ago when it was really cold outside, approx -15 degrees C, the car used the ENTIRE battery for the exact same trip.

I appreciate your help.

 

[ShawnA]

Hi Jillmark99,

Have you owned the car since 2016?
What was the EPA/sticker mileage when you bought it?

If my math is correct 249wh/km would be about 400wh/m...
My lifetime average on a 2018 X100D also on 20" tires is 375wh/m.

Cold as you know severely limits battery output/mileage...
Set heaters on... Set at 1, 2, or 3 bars???

It does not look too far off to me...
Some people here plan/expect 50% of their "normal" mileage in the cold.

Shawn

 

[scottf200]

I have never felt I get the proper charge or mileage out of my model X. I am hoping someone with more Tesla battery knowledge than me can help clarify if what my MX gets is correct or if I need to get the battery looked at. I performed a little test and tried to get as much info as possible to yield some accurate results. I would appreciate feedback on the below.


2016 MX 75D with approx 85,000kms
Charged with HPWC to 100% - 356kms (this seams low to me).
Car sat overnight in a warm 11 degree C garage. Car was still plugged into the HPWC.
I warmed up the car for about 15 minutes prior to departure using the app.
Left in morning with battery at 351kms.
Temp is 2 degrees C outside.
Drove 109.3kms, battery is now at 197kms. Approx 3/4 of the trip was county roads and 1/4 of the trip was city driving. Very little traffic.
Driving was in the dark with cabin at 23 degrees C.
Both front heated seats on for 1/2 the trip.
The car averaged 249wh/km and consumed 27.3kwh for the drive. This is based on the info on the MCU screen.
I did not use AP or cruise for this trip.
I have 20” wheels.
Is this normal? Car used 154kms for this trip?
2 weeks ago when it was really cold outside, approx -15 degrees C, the car used the ENTIRE battery for the exact same trip.
I appreciate your help.

You left out one big factor ... how fast were you driving? I know you did country and city.
You can see below that the speed matters.

1) 2C/35.6F which is fairly cold (battery temp and lubrications (any moving part in drivetain))
and you were heating the cabin to 23C/73.4F which is somewhat warm.
-- I'd use your seat heaters 100% of the time and lower your cabin temp a little.
2) I wonder if your tire pressure is good. I run my Xs at 45 psi cold.
3) Have you used abetterrouteplanner.com tool/website to map out your route? You can put in your vehicle X 75D and at least 5-7% battery degradation. Also put in the 'Road Conditions' and outside temps.
-- clicking on the resulting route line also brings up elevation. Makes a big diff if you are going even a little uphill.

Example of a 348 km drive in 2C for a 75D

 

[Jillmark99]

The drive was fairly flat. Not a lot of hills around here.
I was driving approx 110kph outside the city and about 60kph within city limits.
Tire pressure is at 45psi.

 

[scottf200]

The drive was fairly flat. Not a lot of hills around here.
I was driving approx 110kph outside the city and about 60kph within city limits.
Tire pressure is at 45psi.

Try abetterrouteplanner.com with your temperatures and accurate to/from locations to see it it comes lose. Try the two temperatures 2C and -15C.
P.S. You are welcome for all the details above. Geez.

 

[Jillmark99]

Hi Jillmark99,

Have you owned the car since 2016?
What was the EPA/sticker mileage when you bought it?

If my math is correct 249wh/km would be about 400wh/m...
My lifetime average on a 2018 X100D also on 20" tires is 375wh/m.

Cold as you know severely limits battery output/mileage...
Set heaters on... Set at 1, 2, or 3 bars???

It does not look too far off to me...
Some people here plan/expect 50% of their "normal" mileage in the cold.

Shawn

I have not owned it since new. I purchased it second hand but I’ve owned it for quite a while. Seat heaters are usually on high.

 

[Jillmark99]

P.S. You are welcome for all the details above. Geez.

My apologies. Thank you.

 

[ewoodrick]

I have never felt I get the proper charge or mileage out of my model X. I am hoping someone with more Tesla battery knowledge than me can help clarify if what my MX gets is correct or if I need to get the battery looked at. I performed a little test and tried to get as much info as possible to yield some accurate results. I would appreciate feedback on the below.


2016 MX 75D with approx 85,000kms

Charged with HPWC to 100% - 356kms (this seams low to me).

Car sat overnight in a warm 11 degree C garage. Car was still plugged into the HPWC.

I warmed up the car for about 15 minutes prior to departure using the app.

Left in morning with battery at 351kms.

Temp is 2 degrees C outside.

Drove 109.3kms, battery is now at 197kms. Approx 3/4 of the trip was county roads and 1/4 of the trip was city driving. Very little traffic.

Driving was in the dark with cabin at 23 degrees C.

Both front heated seats on for 1/2 the trip.

The car averaged 249wh/km and consumed 27.3kwh for the drive. This is based on the info on the MCU screen.

I did not use AP or cruise for this trip.

I have 20” wheels.

Is this normal? Car used 154kms for this trip?

2 weeks ago when it was really cold outside, approx -15 degrees C, the car used the ENTIRE battery for the exact same trip.

I appreciate your help.

 

[ewoodrick]

Winter is NEVER the time to attempt to match the car's rating. At 2C, I suspect that you will have over 30% degradation in range. That's just the fundamentals of pretty much any battery.

To see if you are making the range, in the summer with 23C temps, make a highway run at 60 mph from 100% to 10%. That should allow you to get a real estimate of the battery's range.

To get MUCH better understanding, watch the Energy graphs for a real time estimate of your consumption and range.

 

[scottf200]

Winter is NEVER the time to attempt to match the car's rating. At 2C, I suspect that you will have over 30% degradation in range. That's just the fundamentals of pretty much any battery.

To see if you are making the range, in the summer with 23C temps, make a highway run at 60 mph from 100% to 10%. That should allow you to get a real estimate of the battery's range.

To get MUCH better understanding, watch the Energy graphs for a real time estimate of your consumption and range.

A comparative example of how my X is affected by temperatures. This is from TeslaFI.COM built in table it made for my car but I customized in Google sheets for C and km

 

[Jillmark99]

Thanks for taking the time to complete the above comparative.

 

[scottf200]

Thanks for taking the time to complete the above comparative.

Your'e welcome. I was curious myself as I've had some close calls in the winter.

I actually thought the percentages would be a LOT worse the colder it got.

Have you tried A Better Routeplanner ? It has a lot of miles of testing behind it and you can play with temperatures.

 

[Jillmark99]

No I have not tried it. The route in my OP is travelled often by myself and my wife. I might sometime. Was just curious if the battery consumption seamed normal. When I drive my S I don’t use near as much battery.
I know the X chews up the electricity more than the S but my X just seams excessive. Maybe it’s correct, just seams high consumption to me.
Thanks for the replies.