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sustained power consumption on P85D

Discussion in 'Model S: Driving Dynamics' started by brianman, Apr 17, 2015.

  1. brianman

    brianman Burrito Founder

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    For TesS (P85), I think the highest sustained consumption I saw was around 1100 Wh/mi.

    For Mercury (P85D), it can go a bit higher it seems (around 1300 Wh/mi.).

    MercuryConsumption.png

    Anybody seen higher than this sustained? Zex, EA, or Denarius perhaps? Screenshots please. :)
     
  2. Puff

    Puff Member

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    I've done over 1300. It power limits. image.jpg
     
  3. scottm

    scottm Active Member

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    ..you did this while traveling in the car!? HOW WHERE WHAT ... HUH.. would that be possible?
     
  4. brianman

    brianman Burrito Founder

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    Were you able to do that sustained for 15mi or is your 15mi chart less pegged? I'm curious what the car can do; I know I could have pushed it more for the screenshot I took but I'm still calibrating myself to the P85D (vs. P85).
     
  5. vgrinshpun

    vgrinshpun Active Member

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    The screenshots, of course, show energy consumption, not power. In terms of power consumption, the continuous rating of the rear motor is 69kW. Assuming that this power is not further limited by power electronics unit, this would be the sustained power in the RWD cars. i do not have data on the front unit, but assuming that total continuous power is not limited by the battery, it would be equal to the sum of continuous power ratings of front and rear units. so it may be little over 100kW?

    In order to correlate above estimate to your screenshots, one would need to divide screenshot energy consumption by the time it took to travel one mile.
     
  6. brianman

    brianman Burrito Founder

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    For my screenshot, the duration was approximately 23 minutes and the distance was 20 miles.

    20 miles / ((23 / 60) hours) = ~52.17mph

    1340 Wh/mi * 52.17 mph = 69907 Wh/h = 69.907 kW

    Interesting... so that's basically equivalent to maxing out the rear motor continuously and using the front motor "a little". Of course the reality is that it's quite a bit more balanced than that, I presume.


    I should have taken more screenshot to be sure of the above. I'll try to next time.
     
  7. EarlyAdopter

    EarlyAdopter Active Member

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    I never bothered to look at the energy graph after any of my runs at The Ridge, so I can't say.

    Did you hit any power limiting?

    Also, congrats on the new P85D!
     
  8. brianman

    brianman Burrito Founder

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    Yes, but wasn't as severe as in TesS -- it arrived more slowly, and wasn't as punishing (240kW vs. 160kW).
     
  9. billarnett

    billarnett Member

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    So were you driving against a big headwind? Uphill? Pulling a trailer? ???
     
  10. mnx

    mnx 2013 P85

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    He was at a racetrack.
     
  11. trond.strom

    trond.strom Member

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    was it on a dyno maybe? or testing a drag chute? unburdened 69Kw continous would propel the car to somewhere north of 130 mph, not 52 as shown in the calculation.
     
  12. EarlyAdopter

    EarlyAdopter Active Member

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    The graph is maxed out, so you can't see the peaks and valleys that are clipped off that show brief periods of intense braking followed by long periods of sustained, hard acceleration typical of track driving.
     
  13. Zextraterrestrial

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    I don't think I've ever ran really hard for 15 mi but I typically get around 2kW average in autocross
    best I see in my data is 5.7 mi at 2220whr/mi during enduro practice
     
  14. scottm

    scottm Active Member

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    Sustaining power like that must cause things to get hot, so air conditioning or cooling to kick on and start cooling batteries and or drive units.

    Does that account for some of the power consumption?
     
  15. brianman

    brianman Burrito Founder

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    Here's what autocross looks like:

    20140426_Autocross_Trimmed.png

    Sorry for the crappy picture; it was sunny.

    Car reported 55F outside; climate control turned off.
     

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