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Recent content by Embassy

  1. E

    Only using 1/3rd of batteries?

    I think what is meant is that the batteries are being charged and discharged in the 3-4.15 volt range, which is about a third of the total voltage available. The author of the piece doesn't realize that that's what batteries do and how they're supposed to operate, and that restricting maximum...
  2. E

    Roadster battery pack specs?

    I posted on the blog thread too regarding the discharge rate issue, and someone responding to my comment positively was footnoted with a "don't expect answers to every last one of your questions because we have trade secrets we'd like to keep." message. I'm very surprised to learn, though, that...
  3. E

    Roadster battery pack specs?

    Well I'm not taking apart mine! Not that I'll see it this side of next September But does this make sense? Suppose the inverter wants, say, 360V. Though physically in the same container, the high-rate and low-rate strings could probably always manage 360V. And I think you're right.. they'd have...
  4. E

    Roadster battery pack specs?

    Iisjsmith, I think it might be a little simpler than two separate packs and a switching inverter, but still clever all the same. And if I were designing such a thing I would want to scatter my high current lanes in and around my low current lanes so that the heat disappation would be...
  5. E

    Roadster battery pack specs?

    Malcolm, I don't think a pure EV needs regen headroom the same way a hybrid does. The regen energy comes out of the battery pack in the first place rather than from the gas tank as is the case with a hybrid. And once it comes out of a charged battery pack then it has plenty of headroom to go...
  6. E

    Roadster battery pack specs?

    Well, I have a hypothesis that seems to fit all the facts we know about .. try this on: The application is a 4C discharge application, we know the pack is about 375 volts and we know it's 6831 cells. Clearly that's 99 series by 69 parallel. But the 10C cells you can get in the 18650 format have...
  7. E

    Roadster battery pack specs?

    Thanks, Greenspeed.. it's really just reverse engineering, not any actual "info" per se.
  8. E

    Roadster battery pack specs?

    The battery pack is almost certainly 99 cells in series by 69 parallel strings - it's really the only way to make the numbers work out. If you factor 6831 you get 3 x 3 x 3 x 11 x 23, which prettty much tells you how they designed it alongside the 375 nominal volts figure. The difference between...