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So 100D is cheaper on per KWH but less efficient. Worth the FUSC?

Discussion in 'Model S' started by Quesder, Jan 25, 2017.

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  1. Quesder

    Quesder Member

    Joined:
    Jun 14, 2016
    Messages:
    245
    Location:
    San Jose, CA
    Accoring to
    Calculate usable battery capacity based on rated miles values

    "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 usabl
    "
    and 100D is 102.4 kwh total and 98.4 kwh usuable
    The myth of why 90D to 100D upgrade can get more range than 75D to 90D upgrade is resolved: actually it is
    adding 9.2 kWh (for $10000) vs adding 16.6 kwh (for $3000)

    but the average mileage per KWH is less, i.e., less efficient.
    Model X 295/98.4 = 2.9979 257/81.8 = 3.142 237/72.6 = 3.264

    So if you have to charge at home every night, you actually have to pay more over time.
    Somehow the 90D with FUSC is a good balance between range and efficiency?
    Still hard to decide whether to change order or not and the deadline is so close. To me a $500 fee is required.
     
  2. Drucifer

    Drucifer Active Member

    Joined:
    Nov 30, 2014
    Messages:
    1,072
    Location:
    Charlotte, NC
    I would totally do it. Sorry about the efficiency delta - maybe put a couple more solar panels on the roof to offset.

    Plus, if you go on a trip and charge 100% before leaving home, or charge 100% at a destination charger, that may be less kWh you need to buy at the superchargers.
     
  3. Polly Wog

    Polly Wog Member

    Joined:
    Dec 4, 2013
    Messages:
    275
    Location:
    Kihei, Hawaii
    One question to ask yourself, though, is what is your time worth? The 100D will supercharge faster, and depending on the trips you take, need fewer supercharger stops.
     
    • Informative x 2
    • Like x 1
  4. mkjayakumar

    mkjayakumar Active Member

    Joined:
    Aug 18, 2012
    Messages:
    2,838
    Location:
    Dallas, TX
    The decreased efficiency I would think is primarily due to increased weight of 100 over 90 kWh model. So that shouldn't come as a surprise. The increased electricity charges is marginal and should be less than $100 per 10k miles of driving.. just a back of napkin math
     

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