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Resonable voltage sag in the the Tesla model S battery module.

Discussion in 'Battery Discussion' started by xsherlock, Jan 11, 2017.

  1. xsherlock

    xsherlock New Member

    Joined:
    Jun 12, 2016
    Messages:
    2
    Location:
    Italy
    I use 4 tesla model S modules as solar energy storage in DIY powerwall.
    I have a battery managment system connected to it and. the batter nicely ballanced at low currents.

    The problem I see, (if that is a problem) is that when I start heavier discharge at around 150-170A i see one cell V sag a bit more then the others by around .04V . Also this cell when charged is getting to high voltage first (by about 0.02V at 50A charge) So I suspect it is a bit week. I just do not know if that is really a big problem or such a impalance diffrences are normal.

    2017-01-11 11_35_55-ASROCK-VIDEO - TeamViewer.png

    It is cell 6 that you can see is being balanced on the charge.

    Thans for any input.
    Maciej
     

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