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Roof Box on Model S and energy consumption

Discussion in 'Model S' started by amadej, Nov 16, 2014.

  1. amadej

    amadej New Member

    Joined:
    Nov 16, 2014
    Messages:
    2
    Location:
    Slovenia
    Hi!

    Winter time is coming and here are my findings regarding roof box and energy consuption.

    I tested the car on an about 7km long stretch of highway (there and back with an overpass turn) - so together 15.1 km.
    Outside temperature 11 oC, heating inside 21.5 oC.

    The roof box was one of the largest on the market (195x95x44cm). Due to the size of the car and the long roof it doesn't look big on the car at all. The trunk door opens normally.

    3 rounds without the box (only bars) and 3 rounds with the box. Speeds 90, 110, 130 kmh.

    Here are my findings:




    90 kmh
    no box: 198 wh/km

    with roof box: 219 wh/km (+10%)


    110 kmh
    no box: 221 wh/km

    with roof box: 256 wh/km (+15%)


    130 kmh
    no box: 251 wh/km
    with roof box:306 wh/km (+ 22%)


    Absolute numbers are a bit high since they include acceleration to the speed and driving on the overpass when turning back. So with longer distances the absolute numbers should be lower.


    Result:
    With speeds around 100 kmh driving with the roof box increases the energy consumption by about the same amount as driving 20 kmh faster.



    Happy skiing season!
    Amadej


    2014-11-16 10.34.03b (Medium).jpg 2014-11-16 10.34.26 (Medium).jpg



     
  2. Rockster

    Rockster Active Member

    Joined:
    Oct 22, 2013
    Messages:
    1,005
    Location:
    McKinney, TX
    Informative post! Thanks. Just curious: there's so much storage in Model S, what are you using the roof box for?
     
  3. adiggs

    adiggs Active Member

    Joined:
    Sep 25, 2012
    Messages:
    1,347
    Location:
    Portland, OR
    Not that I actually know, but I'm going with the "Happy Skiing Season" closing as a hint (my bet - skis and poles, maybe with 4 people in the car?)
     
  4. amadej

    amadej New Member

    Joined:
    Nov 16, 2014
    Messages:
    2
    Location:
    Slovenia
    Well yes - skiing time is coming. And roof box is the best way to keep wet and dirty out of the car.

    Actually next year we are planing a camping road trip across Europe to Scotland. 1 month of traveling and camping takes a lot of space... :)
     
  5. widodh

    widodh Model S R231 EU

    Joined:
    Jan 23, 2011
    Messages:
    4,822
    Location:
    Middelburg, The Netherlands
    Great information, thanks! With the SuC network becoming more dense the increased energy usage shouldn't really be a problem.
     

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