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Quick Charge Scenarios Near Seattle (or Why I need QC with a 160 miler)

Discussion in 'Model S: Battery & Charging' started by EVNow, Dec 23, 2011.

  1. EVNow

    EVNow Active Member

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    #1 EVNow, Dec 23, 2011
    Last edited: Dec 23, 2011
    Since there were some questions about the need for QC with a 160 miler base Model S, I thought I'd put together a few scenarios. Here are the 4 very well travelled routes from Seattle.

    First some background information. I've had my Leaf now for nearly 10 months and we have all been patiently waiting for the CHAdeMO quick chargers to come online. The news is that, 10 of these unicorns will actually come up by April next.

    qc-scenario.png

    Notes :
    - "Range" is the freeway range assumed 70% of the advertised range
    - I've included a couple of QC that will come in later than Apr '12 under the EV Project
    - I've assumed only 6.6kW L2 as that is what will be available (assuming they will be available at all)
    - Though I've only talked about one way trip, without QC (or 20kW charger) it would be very difficult to make this a one day trip
    - Timings are approximate
    - All distances are from my home some 20 miles east of Seattle
    - A 230 miler will be able to do all but the first drive without a recharge
    - CHAdeMO will charge a Leaf to 80% within 30 minutes and near 100% in 1 hour
    - Once the infrastructure issues are sorted out we will have QC every 40 to 50 miles throughout the I-5 corridor from Vancouver, BC to Baja California.
    - This is the proposed map of QCs in western WA. The blue ones will be up by Apr '12. Hopefully the gray ones (using fedearl money) will be up sometime in the next 2 years.

    [​IMG]
     
  2. onlinespending

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    How come you don't show any recharge on the Leavenworth route even though it's outside the range of the 40 kWh battery?
     
  3. EVNow

    EVNow Active Member

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    Leavenworth is 110 miles away - and we can do about 120 miles on the 40 kilowatter. Actually, given the 5000 ft elevation change, we would probably need some charging in between to be safe.
     
  4. onlinespending

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    OK, for some reason I quickly saw the 80% 96 mile range and that you were using that as the max travel distance as a safety precaution. But now I realize you're using that as the amount charged.
     
  5. NigelM

    NigelM Recovering Member

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    Interesting OP. However, it still comes back to the point made on other threads that if you're driving those distances on a regular basis you should probably be going with a larger ESS.
     
  6. onlinespending

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    yes, if he makes these trips with any degree of regularity, then it would likely make more sense to go for the larger battery pack options. However, what if he makes the trip twice a year but would like the option of taking his 40 kWh Model S on these trips? Personally I would just advocate getting a rental car or using a 2nd car for those trips if only done as irregular as twice a year.
     
  7. Robert.Boston

    Robert.Boston Model S VIN P01536

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    Agree with onlinespending: the real take-away from this example is that the larger battery pack is the best solution if these driving scenarios arise with any regularity.

    But I'll agree with the premise of the OP: Tesla should allow the 40kWh charger access to DC charging, though certainly not the full 90kW power of the Supercharger.
     
  8. EVNow

    EVNow Active Member

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    Well, the whole idea of getting a Model S for me - over Leaf - is that it has a larger range and will enable more travel to be done in EV.

    As you can see, 160 mile + QC is eminently capable of doing the trips I want to do. Compared to the 300 mile car - I'd spend no more than 1/2 hour doing any of these trips. I shouldn't have top spend $10K more - that reminds me of the "let them eat cake" ;-)
     
  9. fairlycool

    fairlycool Member

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    Just posted in another thread as well but Tesla does not want people to quick charge more than 2% of entire lifetime if battery to it will kill the battery.
     
  10. efusco

    efusco Moderator - Model S & X forums

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    EVNow's point here is absolutely key--even if they made it an option for you the wear on the battery over time using QC is just going to kill the battery far too soon. The chemistry of that pack, the range impact with the more frequent QCs it would need vs a pack twice the size, etc. would just mean that you'd need to spend the money you're trying to save now on a larger pack later on a new small pack. Just get what you really need now, you'll have a better warranty, longer range, less need for the QC, and overall more satisfaction.
     
  11. Mycroft

    Mycroft Life happens

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    +1 EVan. If you need to make longish trips more than once a year or so, then bite the bullet and buy a larger battery now.
     
  12. EVNow

    EVNow Active Member

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    As I posted there - I doubt the accuracy of this information. I think this is similar to Nissan's only 1 QC a day (which they clarified in the SanFrancisco townhall to mean only in hot conditions).

    More importantly, we should understand the total capacity of the batteries and how much the BMS will actually use. If they are using near 100% and quick charge is done till that 100%, ofcourse it will kill the battery. But if QC is done till 80% (as the usual practice is) at the 1C or 2C rate that the cells are designed to handle, QC shouldn't have much of an affect on the battery - assuming the temperature is controlled.
     
  13. EVNow

    EVNow Active Member

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    Actually, given that the battery ages (without even being used) and the battery price is falling all the time - it makes a lot of sense to me to get the battery size we need now and upgrade later.
     

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