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Help me understand kWh used

Discussion in 'Model X' started by bell2041, Jul 23, 2018.

  1. bell2041

    bell2041 Member

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    This is a 75D Model X. So my math is 100% is 75kWh, my last charge was up to 90%(67.50kWh), now the car at 55%(41.25kWh) so "Since last charged kWh" should be 67.50-41.25= 26.25kWh, but it says 19.90kWh

    Thoughts?


    tesla.jpg
     
  2. P85_DA

    P85_DA Supporting Member

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    That number is only your driving usage ..not sure if u have cabin overheat on etc ...vampire drain from car sitting there is also not counted in that number
     
    • Informative x 1
  3. bell2041

    bell2041 Member

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    so you mean that 19.90 kWh used only for driving? not including AC/Heat use when car is parked, etc?
     
  4. skraid

    skraid Member

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    Exactly
     
    • Like x 1
  5. dethman

    dethman Member

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    that's a lot (7kwh) of extraneous drain.
     
  6. P85_DA

    P85_DA Supporting Member

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    ~13-14 miles not bad ...OP didn’t say how long car was sitting etc
     
  7. eladts

    eladts Member

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    Also, 75kWh is the nominal capacity of the battery, not the useable one. There are buffers above 100% and below 0% to protect that battery.
     
  8. Uncle Paul

    Uncle Paul Active Member

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    75 battery is slightly less than 75. Think it more like a 73 or so, rounded up to 75>
     
  9. animorph

    animorph Member

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    Many many threads on this. My favorite answer is that you get more energy out of the battery if you take it out slowly. So your calculation should look closer to advertised capacity if you just travel at 25 MPH steady-state. And the kWh added during charging will probably be closer to the real battery capacity than the kWh measured coming out of the battery, which will depend on how you drive. One reason is the internal resistance of the battery. The more current coming out of the battery, the higher the internal losses, which are not captured by the measurement you are seeing.
     
  10. animorph

    animorph Member

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  11. hill

    hill Active Member

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    I've seen worse, especially during updates. And for the OP, don't forget (or, fyi) your 75 Tesla does not actually have 75kWh's usable - even if it were brand new straight off the manufacturing floor. iirc, it's ~72kWh.
    .
     
  12. bell2041

    bell2041 Member

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    I like to leave my car with "keep AC ON" (for like 10-15 minutes at a time), so I wanted to find out how much does AC actually uses, I guess it's 7kWh :)
     
  13. unpollo2

    unpollo2 Member

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    i do this all day i'm out, i find it is very efficient like 3 miles an hour drain, but i set the fan to 3 or 4 and recirculate on
     

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