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Wall Connector Daisy Chain Question

Discussion in 'Model S: Battery & Charging' started by Driver Dave, Dec 15, 2016.

  1. Driver Dave

    Driver Dave Member

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    Oct 10, 2016
    Messages:
    211
    Location:
    Boston, MA
    I had one Wall Connector that did:

    35 mi/hr 230V 48/80A

    I just added another one and daisy chained and now they charge at:

    13 mi/hr 230V 20/20A Model S 75D
    4 mi/hr 230V 20/20A Model X 90D

    The batteries are super cold right now (they where outside while electrician was working) so mi/hr may be low because of that.

    But in general, does the 20/20A look correct? Should be say 24/40A?
     
  2. MP3Mike

    MP3Mike Active Member

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    I would check and make sure that the amperage setting is correct on the master WC. (Maybe it got set to 40A accidentally instead of the 80A it was set at before.)
     
    • Informative x 2
  3. Driver Dave

    Driver Dave Member

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    Yep, that was it. Master set to 8 instead of D.
     
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  4. MP3Mike

    MP3Mike Active Member

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    Great! Glad it was a quick fix!

    So now are you getting ~40A on both cars when charging at the same time?
     
  5. Driver Dave

    Driver Dave Member

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    Location:
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    Yes, it looked like this with 1 Wall Connector:

    IMG_0535.PNG

    Now it looks like this, 1 shot for each car:


    IMG_0538.PNG

    IMG_0539.PNG

    Two interesting things:

    I thought I'd get 35/2 mi/hr on each (half), but I'm getting 25-28 (more than half each)

    When I had one car plugged into one not daisy changed unit it read 48/80A, now when I have one car plugged into one daisy chained unit but not with the other plugged in, it reads 48/48A.
     
    • Like x 2
  6. MP3Mike

    MP3Mike Active Member

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    That is because you had it wired to supply up to 80A, and the standard charger can only handle 48A of that. So when adding a second car it splits it in half. If you had only wired the WC up to handle 48A, then it would have split it in half 24A for each car.

    Note: It isn't always split 50/50. If one car is has a significantly lower charge level it will get more of the available power. (In your case that wouldn't make much difference as the lower charged car would get 48A while the other car would get 32A.)
     
    • Informative x 1

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