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Thread: Regen limited due to cold today

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    Senior Member cinergi's Avatar
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    Regen limited due to cold today

    Haven't seen anyone mention this yet ... It was low 40's (F) today and when I got in my car, there was a yellow dotted line in the regen area indicating regen was limited. I was quite surprised, for two reasons (as compared to the Roadster). 1) It wasn't on/off and 2) it had to be a LOT colder outside for the Roadster to disable regen (I realize we're not comparing apples to apples here -- on/off vs. limited regen)

    Regen slowly increased and was back to normal within 10-15 minutes (I missed when it went back to normal).

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    Roadster 919, S 2006 Doug_G's Avatar
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    Wow, I don't believe my Roadster has ever gone into limit mode unless it was sitting for hours well under freezing. I guess the algorithms are more conservative in the Model S. I wonder if this is just increased prudence or whether there is a battery chemistry difference?
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    Senior Member cinergi's Avatar
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    Yeah my Roadster would need to set at below-freezing temps for hours. The Model S sat in ~43F temps for 7 hours or so, mostly in the sun (after being parked in 65-70F temps overnight). Interior cabin temperature while it was parked those 7 hours while the sun was up was 65-70F.
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    V1538 Zextraterrestrial's Avatar
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    The battery in the S is directly under vs the roadster in the 'middle' maybe that has a little difference wrt ambient temps?
    but more likely different control algorithms
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    Head Moderator / Administrator doug's Avatar
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    I was thinking along these lines. Also with that flat pack, the Model S battery has much more surface area per unit volume.

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    S85 - VIN:P05130 - 3/2/13 jerry33's Avatar
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    So some enterprising person, perhaps SoftAuthor, needs to come up with an easily removable bottom insulation solution.
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    mod squad NigelM's Avatar
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    Somewhat OT, but would extreme cold affect the touchscreen?

  8. #8
    S85 - VIN:P05130 - 3/2/13 jerry33's Avatar
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    Quote Originally Posted by NigelM View Post
    Somewhat OT, but would extreme cold affect the touchscreen?
    It will make it slower and perhaps dimmer.
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    Member William13's Avatar
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    My car had the same regen limiter the last few days in the morning. I hadn't thought about it. It moderated over a few minutes. Then the line disappeared.

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    Model S R77 efusco's Avatar
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    Quote Originally Posted by jerry33 View Post
    It will make it slower and perhaps dimmer.
    Or almost unusable...even the Prius screen in sub 20F is barely usable.


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