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Why would we see same miles added with 8.32 kW or 7.68 kW charging?

Discussion in 'Model 3: Battery & Charging' started by Rockster, Aug 28, 2018.

  1. Rockster

    Rockster Active Member

    Oct 22, 2013
    McKinney, TX
    A friend of mine also has a Model 3 and our workplace just installed a bank of Tesla wall chargers for our use, so we've been experimenting with them the past couple of days. They're on three-phase power so when we plug either car in we are seeing 208V/40 amps, or 8.32 kW. When charging at this rate the car reports that it's adding 30 miles of range per hour.

    Oddly enough, my friend's Model 3 still reports 30 miles of range per charge hour when he is at home, charging on his mobile charger from a NEMA 14-50 with the car is pulling 240V/32 amps, or 7.68 kW.

    It would seem that if 7.68 kW at home gives him 30 miles per hour (which it very consistently does, for months now, he reports), that the 8.32 kW charger at work would show more than 32 miles per hour instead of the same 30 miles per hour.

    Any ideas why the car is reporting 30 miles per hour whether charging at 8.32 kW or at 7.68 kw?
  2. LGA737

    LGA737 Member

    Dec 19, 2017
    Have you looked at the actual voltage delivered while charging? If at work you’re actually only getting 200v and at home you’re actually getting 245v, you’d be charging at 8kw at work and 7.84kw at home which is very close to the same power.

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