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  1. From ICE cars, a BEV will have much reduced running costs. Basicly it's tires and washer fluid. Brake pads and disc will last much longer thanks to regen braking. The AC motor is made to last forever. The battery is the biggest factor. The 100k miles figure for down to 80% capacity makes it a five years thing for me. But considering the degration curve will flatten (is it?) would it be save to assume that at 200k miles will be at, lets say, 70%? What do you think?

    What about fluid pumps / hoses? Fans? How long is the PEM supposed to last? Are there any reports on dying PEMs?
     
  2. TEG

    TEG TMC Moderator

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    I think things tend to get progressively worse... Pack replacement starts to become desirable due to not only loss of capacity but reduced performance due to increased internal resistance.

    GNOME Power Manager Manual

    [​IMG]

    Range mode charging (to higher voltage) hurts pack life:
    [​IMG]

    [​IMG]

    Note, the above charts are general representations, NOT specifically meant to indicate what will happen with a Roadster pack.
     
  3. Todd Burch

    Todd Burch Electron Pilot

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    Not to mention that, due to the increasing internal resistance, it's going to be less and less efficient to charge as the battery degrades.

    I see it like this: Even 70% of a 250 mile battery would get you on the order of 150 miles (roughly). That's still plenty for most of my driving, and the longer I can put off getting a new battery pack, the better the next battery pack will be. Who knows...maybe your second Model S battery pack will have 1000 miles range!
     
  4. Cobos

    Cobos S60 owner since 2013

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    My idea has been to continue the car payments after the loan is payed back and use that to build up a nice little battery-replacement-fund. That should be enough for a new battery.

    Cobos
     
  5. dpeilow

    dpeilow Moderator

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    Question: What's the MTBF of the Tesla motor in typical stop-start operation?
     
  6. TEG

    TEG TMC Moderator

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    AC motors are usually one of the more reliable parts of a system like this.

    Random examples:
    AC Drive features MTBF of 28 years., Yaskawa Electric America, Inc.
    AC Motor Drives Data Sheets from Eaton's Cutler-Hammer Drives
    Aside from usual consumables (tires, brake pads, etc.) my concerns would be:

    #1: Batteries wearing out from cycling.
    #2: Batteries wearing out from old age.
    #3: Batteries wearing out from improper charging (e.g.: Left off charge too long, left at full charge in extreme heat, etc.)
    #4: Auxiliary DC motor components wearing out - water pumps, cooling fans, etc.
    #5: Some component in the PEM wearing out (e.g.: capacitors). Possibly due to environmental conditions like moisture or static discharge. <-- (Since inception, I bet this is where they have made more advancement than anywhere else. )
     
  7. vfx

    vfx Well-Known Member

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    All reasons that I would be terrified to buy a Leased or Rental Electric car. Am I right? Can you even test for this at purchase?
     
  8. dpeilow

    dpeilow Moderator

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  9. OTOH I found this

    here.

    But it also mentions five years calender live. So even if I would put it in "holiday" mode for five years it'll be worn out?
     
  10. TEG

    TEG TMC Moderator

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    Yes, batteries tend to have a "shelf life" and will degrade over time even if you aren't cycling them. Some cell formulations last longer than others. I can't really say how a Roadster would behave if you just put a new one in a museum for 10 years, but I suspect it would be not as good as new.
     
  11. vfx

    vfx Well-Known Member

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    AHH but will they? Privacy issues ya know...
     
  12. stopcrazypp

    stopcrazypp Well-Known Member

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    I should probably mention that the calendar life will depend on what charge level and temperature you are storing the battery pack at. The "storage" mode on the Roadster optimizes this.
     

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