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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.

  1. Quesder

    Quesder Member

    Jun 14, 2016
    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

    Nov 30, 2014
    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

    Dec 4, 2013
    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. Electroman

    Electroman Active Member

    Aug 18, 2012
    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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