Telsa w/h per mile vs true w/h

[ay221]

I am keeping monthly tabs on how much the Tesla vehicle says I used in the trip odometer vs what the chargepoint monthy stats shows.
For the month of November, I used 300 miles or range. Tesla shows that I averaged 265 Wh/mile. Using charge point it shows I charged up 112 kWh for the entire month.

if I divide 112,000 to 300 i get 373 Wh/mile.

Is the big difference because of the loss energy when charging up a vehicle or is Tesla not showing the true amount?

 

[dhrivnak]

I am over as well but not nearly that bad. I am at 270W/mile. I do have the aero 18" wheels, which helps but the Cross Climate 2's which hurts.

 

[Gauss Guzzler]

I checked my car:

The odometer screen consistently reads 300-305 Wh/mi
Charging stats in the app reads 286 kWh in the last 31 days (32A charging only)
Gas savings in the app reads $124 by comparing my car to a 30 mpg dinosaur at $4.45/gal, which comes out to 836 miles

So 286kWh/836mi = 342 Wh/mi

That suggests my total consumption is about 13% higher than the basic Wh/mi which is certainly believable with all the power conversion losses and other losses when parked, charging, sentry, software updates, etc. that aren't factored into the Wh/mi reading on the odometer. And note that I'm slow charging in California - fast charging will always consume more power for battery temperature management, especially in cold climates.

 

[jdcollins5]

I am keeping monthly tabs on how much the Tesla vehicle says I used in the trip odometer vs what the chargepoint monthy stats shows.
For the month of November, I used 300 miles or range. Tesla shows that I averaged 265 Wh/mile. Using charge point it shows I charged up 112 kWh for the entire month.

if I divide 112,000 to 300 i get 373 Wh/mile.

Is the big difference because of the loss energy when charging up a vehicle or is Tesla not showing the true amount?

Trip Odometer and Range Miles are two totally different numbers. Odometer is what it says it is, actual miles
driven. Range Miles is a calculation based on EPA testing and Battery BMS calculation.

Tesla’s Wh/m is total energy used while driving, which includes AC, heat, etc. It does not show energy used while in Park. The easiest way to see this is the new Energy Graph features.

it sounds like you need to compare Tesla’s kWH per month compared to the ChargePoint kWH. Tesla kWH is on the DC side and ChargePoint is on the AC side. There is roughly a 9-10% loss in the AC-DC conversion.

 

[AlanSubie4Life]

I am keeping monthly tabs on how much the Tesla vehicle says I used in the trip odometer vs what the chargepoint monthy stats shows.
For the month of November, I used 300 miles or range. Tesla shows that I averaged 265 Wh/mile. Using charge point it shows I charged up 112 kWh for the entire month.

if I divide 112,000 to 300 i get 373 Wh/mile.

Is the big difference because of the loss energy when charging up a vehicle or is Tesla not showing the true amount?

You have a 2022 Performance. Unfortunately even though you say you used 300 miles of range in November, we can't say how much energy you used. If you used that only while driving (most likely not the case, but I don't know how you arrived at this number), that would mean you used:

300rmi * (80.6kWh/315rmi) *0.955 = 73.3kWh.

And you traveled 73.3kWh/265Wh/mi = 277 miles.

But really it would be better to specify how many miles you traveled in November so we can get the actual correct values here.

But in any case, what people said:
1) Rated miles decay even when parked so don't represent how many you used while driving.
2) Trip meter shows energy used only while driving but you didn't specify how far you drove so we can't determine how much energy you used.
3) The energy used at Chargepoint is hard to use here because to use it to compare you have to assume that you started and ended the month at exactly the same SOC (otherwise you might be counting energy used that is still in your pack, or similarly, not counting energy that you used that you still need to replace).
4) Energy used at Chargepoint includes charging losses, and also it will reflect other losses that occurred while parked that have to be added back to the pack, and these can be significant. Adding 20-50% on top of the trip meter is generally reasonable to estimate wall-to-wheels efficiency, but it's a huge range depending on conditions, charging setup, feature usage, etc.
5) The 373Wh/mi is not correct because you divided by rated miles, not miles.

Anyway if we went with the 277miles traveled (probably wrong), that would work out to 404Wh/mi, but see other caveats above about starting/ending SOC in month.

 

[ay221]

So what I meant was actual 300 miles of odometer was used.

 

[AlanSubie4Life]

So what I meant was actual 300 miles of odometer was used.

Ok. So 373Wh wall to wheels (assuming starting/ending SOC was the same!) is the correct answer.

Everything makes sense otherwise.