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Odometer historical kwh total not inclusive of vampire load?

Discussion in 'Model S: Battery & Charging' started by mrbry, Jun 20, 2013.

  1. mrbry

    mrbry Member

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    #1 mrbry, Jun 20, 2013
    Last edited: Jun 21, 2013
    Trip meter kWh total not inclusive of vampire load

    (Apologies if this has been already mentioned, but I did quickly scanning through posts in this folder but didn't see anything pointing this out. Mods, feel free to move this to the lifetime kwh topic but I think that thread's just keeping track of people's totals so I didn't want to clutter it.)

    I believe this impacts folks calculating their lifetime kwh usage based on the trip B total they're avoiding resetting.

    I just confirmed my theory today when charging at a chargepoint station today. My trip A which has kwh since last charge said something in the 7kWh range. Chargepoint however indicated I pulled 11kWh and some change. It's been about a day since I last plugged in. So maybe we should factor in a 4kWh * # days since delivery to the overall kWh totals when calculating lifetime electrical consumption.
     
  2. yobigd20

    yobigd20 Well-Known Member

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    it's not a 1:1 ratio. charging isn't 100% efficient, so you're not going to get 11kwh of charge from 11kwh of energy pulled from the socket.
     
  3. Monto

    Monto Member

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    This is true, but it also does not include vampire load. If you look at any of the trips and then leave the car unplugged for 1 or 2 days, the range will go down, but the kwh used will not go up. It is truly kwh USED, not lost.
     
  4. JohnQ

    JohnQ Active Member

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    Yup, that's right.
     
  5. brianman

    brianman Burrito Founder

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    Terminology Patrol:
    "Odometer historical kwh"

    The title of the thread suggests that "Odometer" and "kWh" are related. They are not. The author means "Trip Meters".

    Odometer refers to mileage on the vehicle. It gets fuzzier when you do things like replace the motor, but not fuzzy regarding "miles" vs. "kWh".

    Why it matters: "Tesla Model S has faulty or misleading odometer! Film at 11."
     
  6. mrbry

    mrbry Member

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    Sorry! Can the mods update the threat title to say "Trip meter kWh total not inclusive of vampire load"? I don't think I can edit it myself...
     
  7. Monto

    Monto Member

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    Not sure why you think the odometer is misleading. It accurately reflects kWh used on the trip meters and miles driven. Both working when the car is on. If you run the air or heat with the car off, the kWh will not change.

    If you tow any modern car, the odometer does not change. You could put wear and tear on the suspension and use up the tires, but the odometer will not reflect this. Is this misleading? People tow cars behind motorhomes all the time and see this.
     
  8. mrbry

    mrbry Member

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    Yeah, but this is pretty bad either way. out of 7kWh I pulled an extra 4kWh! So some of that 4kWh was vampire and some of that was overhead of charging. I've gone through about 2MWh so far on my car and have had it for over 6 months. Assuming 3kWh (hypothetical, subtracting 1kWh from overhead that might have been from charging) vampire drain per day, that comes out to 540kWh (180 days) of vampire drain so far. Over a 25% increase if I just looked at my Trip B (lifetime) reading.
     
  9. brianman

    brianman Burrito Founder

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    I think you're misunderstanding my post. My point was/is that terminology matters and "Odometer" and "kWh" are not connected. We have historical evidence that "people with publishing power" are generally stupid enough or misguided enough to publish anything to get headlines about Tesla vehicles - pro or con. So "we must be cautious" about our terminology and phrasing.

    - - - Updated - - -

    No worries, mrbry.

    Best option is to update the title that shows in the first post and hope that the mods see your request and update the thread title to match.
     

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