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Actual Accessible KWH in your battery?

Discussion in 'Model S: Battery & Charging' started by Whiterabbit, Jul 2, 2018.

  1. Whiterabbit

    Whiterabbit Member

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    Hey All.

    Wanted to know what people are seeing as their actual KWH available in you battery. I have a P100D and I just did my first road trip. Got down to about 8% from 100%. Based on the reported KWH used my total was between 86-89 actual KWH in my battery. Is this typical?

    I have heard that the 85kwh battery has somewhere around 74kwh?

    What are your experiences?
     
  2. aesculus

    aesculus Still Trying to Figure This All Out

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    Yep. Around 87% is what I have seen in my 90 when new. Some say they see less.
     
    • Like x 1
  3. snd92

    snd92 Member

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    #heatloss
    It is called kWh or kilo-watt-hour and not kelvin-watt-henry :p
     
  4. Naonak

    Naonak Member

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    The 90 packs have about 79 KWh usable, and the 85 packs have about 76 KWh usable. The 90 packs are a pig-in-a-poke all-ways around, given their DCFC throttling, barely upgraded range (a whopping real world 5 miles on average), and accelerated degradation. Get an 85 pack if you're deciding between a 90 and an 85.
     
    • Like x 1
  5. Tummy

    Tummy Member

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    • Original 60 – ~61 kWh total capacity, ~58.5 kWh usable.
    • 85/P85/85D/P85D – ~81.5 kWh total capacity, ~77.5 kWh usable
    • 90D/P90D – ~85.8 kWh total capacity, 81.8 kWh usable
    • Original 70 – ~71.2 kWh total capacity, 68.8 kWh usable
    • 75/75D – 75 kWh total capacity, 72.6 kWh usable
    • Software limited 60/60D – 62.4 kWh usable
    • Software limited 70/70D – 65.9 kWh usable
    • 100D - 102.4 capacity, 98.4 kWh usable
     
    • Informative x 1
  6. Naonak

    Naonak Member

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    I've never been able to charge more than about 78 kWh into 4 separate 90 packs.
     
  7. asghair

    asghair New Member

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    Wow, good
     
  8. Tummy

    Tummy Member

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    These are supposedly the values from the Battery Management System that hacker Jason Hughes pulled from the system. Maybe the packs were degraded. The 90 packs have the worst degradation from charging data posted on this forum.
     
  9. Naonak

    Naonak Member

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    Yes, I know. I'm one of the ones who discovered that fact, sadly. No, the packs were not degraded, 3 of them were brand new.
     
  10. Tummy

    Tummy Member

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    I was considering trading in our locked S 60 for a 90D until I read about the actual capacity and degradation issues. 78 kWh is pretty bad.
     
  11. Whiterabbit

    Whiterabbit Member

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    Should a p100d be charging up to 98.4kwh? I know the 90 pack had lots of issues.
     
  12. ran349

    ran349 Member

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    You need to be more specific. Are you saying you charged to 100% and at 8% remaining the odometer showed 86-89 kWh used? And which was it, 86 or 89?
     
  13. Naonak

    Naonak Member

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    It doesn't really matter what it shows as used, as some power isn't accounted for in that. What you really need to do, without hacking in to the MCU, is to drain your car to shut off point and then charge it, preferably with a DCFC, to max and see how many kWh is able to be charged in to the battery. That will give you a more accurate idea of what your usable capacity is.
     
  14. Whiterabbit

    Whiterabbit Member

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    Yes. Charged to 100%, drained to 8% and I calculated 86kwh total using the kwh/mi that tesla reports for the p100d and 89kwh using the actual kwh/mi recorded during my trip.
     

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