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What's your Wh/mi when taking a long road trip?

Discussion in 'Model X: Battery & Charging' started by NoVIN4Me, May 31, 2016.

  1. NoVIN4Me

    NoVIN4Me Member

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    Was using 450+ Wh/mi driving at 80-85 mph on I-5 in CA over the weekend. Wonder what's the most optimum speed vs. time (energy) combination?
     
  2. Saghost

    Saghost Active Member

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    If you have enough Superchargers close enough, and no limitations from the law, it's probably even higher than that. The bottom half of the Supercharger charges at over 200 mph even at those high consumption rates, so the faster you can race to the next charger, the shorter the overall trip.

    That's not how I would choose to drive the trip, but the math works out. In theory the highest overall speed should be near where the average charge rate equals the average discharge rate...
     
  3. SageBrush

    SageBrush Active Member

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    I gave this some thought and was not able to generalize a solution.
    1. If SCs are close together, the slower driver can save time by skipping chargers.
    2. If they are further apart the fast driver may have to fill up past the fast charge rate.
     
  4. ohmman

    ohmman Maximum Plaid Member

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    Ouch. 450+ is pretty bad. Over what distance?

    @Saghost is right - if the Superchargers are directly off of the highway, as they are on I-5. If you have to slow down through a town or city and take a hit on your average speed, then maybe it's not worth it.
     
  5. digicool

    digicool Member

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    In my recent 347 mile trip over the last weekend, we averaged 356 Wh/mi

    1. Temps around 70F
    2. Bulk of the highway ride averaged 70mph
    3. About 80% highway miles

    And on my routine route to work this week I am averaging about 330 Wh/mi
     
  6. NoVIN4Me

    NoVIN4Me Member

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    For the 450+ Wh/mi average it was over a 350+ mile trip and we were averaging 80-85 mph. I need to start monitoring my normal non-road trip consumption and see if things improve.
     
  7. loganintx

    loganintx Member

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    450 Wh/Mile on a 90kWh battery would get you 200 miles. Take into account the 80-85mph speeds and that would translate to ~220 miles at 65-70. Take into effect the 10-15% range reduction for 22" and that gets you to 251miles which is pretty close to the rated 250/257 miles.

    So I would expect that if you drive at 85mph on 22" tires in a P90D that 200 miles would be the extent of your range on a full charge if not a tad less than 200 miles.
     
    • Informative x 1

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