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Usable energy for 90 and 70kWh packs?

Discussion in 'Model S: Battery & Charging' started by emir-t, Nov 29, 2015.

  1. emir-t

    emir-t Member

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    Location:
    Istanbul
    We know that with the 85kWh pack usable energy is 74-75kWh. (that is hitting the road with 100%, driving till you see "Charge Now" and checking from the tripmeter energy used) So averaging 310Wh/mi that means ~240 miles on a single charge. Makes sense.

    Has anyone tested this stuff out with the newer 90 and 70kWh packs? I think usable energy before cutoff makes more sense to calculate how far you'll go on a charge.

    Side question; we know that the 85kWh pack consists of 3100mAh, 3,8V (nominal voltage) 18650 cells. (7104 of them) (p.s. none of this data is official. They're all educated guesses from what people on the internet and forums came up with)
    • 74 in parallel makes a group. (74*3,1Ah = 229Ah)
    • 6 groups in series make a module (3,8V * 6 = ~23V)
    • 16 modules in series make the pack (23*16= 368V) (Max. charging voltage is ~403V but I'm talking about nominal voltage, read about this somewhere)
    • 368V*229Ah = ~84200Wh --> 85kWh.

    What about the newer 90kWh packs? I've read it was the result of better chemistry by adding very very little amount of silicon to the cathode. So let's say cells are now 3,3Ah instead of 3,1Ah, that takes us to a 244Ah pack. With the same voltage we get 89.865Wh, hence, 90kWh.

    What do you guys think? Anyone tested their new 90kWh pack out?
     
  2. widodh

    widodh Model S R231 EU

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    This unofficial picture for the 85kWh battery might be useful to add:

    tesla-model-s-battery-overview.jpg
     
  3. emir-t

    emir-t Member

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    Yeah this is a very old photo back when first Model S' started to get delivered I think. I thought this was proven to be completely wrong. Anyone else with their 2 cents?
     
  4. apacheguy

    apacheguy Sig 255, VIN 320

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    Yes, consensus on the forum is that the image is false. Also, note that the 85 kWh pack is actually 82 kWh and the 60 kWh pack is actually 64 kWh.
     
  5. widodh

    widodh Model S R231 EU

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    Ok, I should probably not post that image again then. But, 85kWh is 82kWh?

    Do we know how much kWh a 90kWh pack is? 88 or something?
     

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