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Potential battery pack upgrade for Roadster using Model S cells

Discussion in 'Roadster: Performance' started by dsm363, Feb 16, 2012.

  1. dsm363

    dsm363 Roadster + Sig Model S

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    If Tesla offered an upgraded battery pack for the current Roadster using the 3.4A Model S cells (I think I have the correct number), would that also lead to faster acceleration as well as longer range? I think this would be a great upgrade offer from Tesla (even though many people wouldn't take them up on it for a few years until warranties start running out) and provide great, free advertising pushing the range to around 350 miles I think if the number of cells are kept the same.
     
  2. widodh

    widodh Model S 85kWh

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    I think acceleration is limited by the PEM, not the pack?

    In a couple of years we'll start seeing Roadsters who need a new pack. It would indeed be great if they were able give the range a boost!
     
  3. W.Petefish

    W.Petefish Active Member

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    The acceleration rate is limited by the discharge rate of the cells.

    For example, a 20C rate battery pack will push out more than 36A from a hobby pack. A 40C rate one will push out 72A.

    They could offer 2 options:
    1)Same weight w/ greater range (350 Miles)
    2)Less weight w/ same range (245 Miles)

    I'd like 1 the best.
     
  4. jory

    jory Member

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    option #1 please. :)

     
  5. jcstp

    jcstp Active Member

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    I guess option 1 will be the easyest to implement! (no change to the suspension)
    The second will implement some R&D, + less cells = lower endurance of the batterypack (note the garantie in Model S depending on batterypack)
     
  6. Kevin Sharpe

    Kevin Sharpe Active Member

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    option #1 so that we can undertake some decent long distance tours and enter Gumball, etc....
     
  7. felixtb

    felixtb RsEU502,Sp+14274,XpEUSig4

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    yes more range would be great!
     
  8. dsm363

    dsm363 Roadster + Sig Model S

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    Would the discharge rate of the Model S 85 kWh pack cells in option 1 increase acceleration while still having more range?
     
  9. frequencydip

    frequencydip Sig 100 - #52

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    What about option 3?
    Same weight, same range w/ faster acceleration (Quarter Mile 11.4)

    I'll take 3...
     
  10. W.Petefish

    W.Petefish Active Member

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    Not likely. They'd have to upgrade the motor to do that.
     
  11. bonnie

    bonnie Oil is for sissies.

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    Range. I want the range, please.
     
  12. dsm363

    dsm363 Roadster + Sig Model S

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    I want more range and gotta have more cowbell. Mostly range though.
     
  13. frequencydip

    frequencydip Sig 100 - #52

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    Software and PEM maybe but motor not likely. The motor is unlikely receiving maximum current all the way up to 14,000 RPM. They battery has a max output based on the number and arrangement of cells, a denser configuration can increase that power output. The Model S goes quicker/faster based on battery pack for just this reason.
     
  14. raumgleiter

    raumgleiter Member

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    range means speed ;-). we with more than 30 others tesla to geneva - end distance was 333km and i had 56km left in geneva - you can do this if you drive about 100km/h. if you have a battery with more capacitiy, you just can drive faster... and play transformerss with other evel cars...
    424811_3455358273601_1819835674_n.jpg
     
  15. dhrivnak

    dhrivnak Active Member

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    I just had a visit from my Ranger and he said they are working on a battery pack with Model S cells. Unfortunately he did not know any more details. The price will likely be under $40,000 as we know that is the current price of a battery replacement and I think it is safe to assume it will not be under $12,000 as that was the price of the battery warranty.
     
  16. stopcrazypp

    stopcrazypp Well-Known Member

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    That should be exciting. Given the Model S uses 3100mah vs the 2400mah cells in the Roadster, they can either:
    1) Keep the same number of cells and get 1.29x the capacity (72kWh) and power (only useful if they upgrade the firmware/motor/power electronics to use it).
    2) Keep the same capacity and use less cells, shaving 22.6% the cell weight (~150lbs) and volume (plus whatever overhead).
     
  17. dhrivnak

    dhrivnak Active Member

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    I think i vote for less weight which should help acceleration, handling and range to a lesser degree.
     
  18. smorgasbord

    smorgasbord Active Member

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    I wish Tesla would wait another couple of years, so that battery technology can improve even more. Right now there aren't many Roadsters that need new packs.

    I would hope that Tesla would have two options:
    1) More Range, same pack size/weight
    2) Same Range, less weight and that weight set as low as possible in the car.
     
  19. dsm363

    dsm363 Roadster + Sig Model S

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    I agree. Once the Model X is launched in 2014 the 3.4A cells in the 85kWh pack will longer be new tech and should be slightly cheaper. Would be a good option I think. I'd vote for more range if there was only one option.
     
  20. Kevin Sharpe

    Kevin Sharpe Active Member

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    Sorry but I disagree... I want Tesla to give us lots options... some wealthy early adopters will buy on day one and others will buy later.
     

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