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The Most Efficient Charging Amperage

Discussion in 'Wiki' started by bollar, Dec 14, 2014.

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  1. bollar

    bollar Disgruntled Member

    Joined:
    May 1, 2013
    Messages:
    2,240
    Location:
    Southlake, TX
    This wiki is s summary of my Model S Charging findings first covered in this thread: What is the Most Efficient Charging Amperage?

    In short, I am measuring the kWh required by my car to charge to 90% at various amperages, temperatures and battery discharge states and I'm looking to discover if there is an amperage that uses fewer kWh per Ideal Mile charged.

    My findings are that there is no statistically significant difference in the parameters tested so far (but the experiment continues).

    Data Sources:
    - kWh: Powerhouse Dynamics SiteSage
    - Charging Times & Mileages: VisibleTesla
    - Charging: Tesla HPWC (80 amp)

    Observations:

    - 40 Amps does appear slightly worse than other amperages, but I believe there's an outlying sample that will wash out with more data.

    Summary Table by Amperage


    Summary




    Amps# SamplesMin kWh/IdealAvg kWh/IdealMax kWh/IdealStdDev kWh/IdealAvg Minutes/Ideal
    2010.2860.2860.286#DIV/0!3.4
    4030.2920.2950.3030.0061.8
    6040.2780.2850.2970.0081.1
    8030.2640.2840.2980.0180.9
    Grand Total110.2640.2880.3030.0111.4


    Summary by Amperage and Percentage of Battery Charged (rounded to 10%, assuming Max Ideal of 300 miles)


    Deciles




    Amps# SamplesMin kWh/IdealAvg kWh/IdealMax kWh/IdealStdDev kWh/IdealAvg Minutes/Ideal
    2010.2860.2860.286#DIV/0!3.4
    6010.2860.2860.286#DIV/0!3.4
    4030.2920.2950.3030.0061.8
    1010.3030.3030.303#DIV/0!1.9
    4020.2920.2920.2920.0001.8
    6040.2780.2850.2970.0081.1
    2020.2780.2810.2840.0041.1
    3010.2970.2970.297#DIV/0!1.1
    4010.2830.2830.283#DIV/0!1.1
    8030.2640.2840.2980.0180.9
    3010.2980.2980.298#DIV/0!0.9
    5020.2640.2770.2900.0180.9
    Grand Total110.2640.2880.3030.0111.4
    Summary by Ambient Outdoor Temperature at Charge Start (Rounded Down to Nearest 10 degrees F)


    Deciles




    Temp F# SamplesMin kWh/IdealAvg kWh/IdealMax kWh/IdealStdDev kWh/IdealAvg Minutes/Ideal
    40





    4010.3030.3030.303#DIV/0!1.9
    6020.2830.2900.2970.0101.1
    50





    4020.2920.2920.2920.0001.8
    6010.2840.2840.284#DIV/0!1.1
    8010.2900.2900.290#DIV/0!0.9
    60





    2010.2860.2860.286#DIV/0!3.4
    6010.2780.2780.278#DIV/0!1.1
    8020.2640.2810.2980.0240.9
    Grand Total110.2640.2880.3030.0111.4
    Summary by Normalized Time (Time to Gain 1 Ideal Mile Normalized to 80 Amp Charge)


    Norm Minutes




    Temp F# SamplesMin of Norm Min/IdealAverage of Norm Min/IdealMax of Norm Min/IdealStdDev of Norm Min/IdealAvg Minutes/Ideal
    2010.840.840.84#DIV/0!3.4
    4030.870.910.940.0331.8
    6040.840.850.860.0101.1
    8030.860.870.890.0160.9
    Grand Total110.840.870.940.0331.4
    kWh per Mile Charged 141214.png
     
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