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Tesla supplied charger vs Juicebox

Discussion in 'Model S: Battery & Charging' started by Altes, Nov 16, 2016.

  1. Altes

    Altes Member

    Sep 30, 2016
    SF Bay area
    New to EV's taking delivery MS60 saturday (woot!). bought a Juicebox 40 pro and wondering how much faster it is than the Tesla charger that comes with the car, Just saw that it has 240 plug too so Ive seen 29MPH with tesla supplied unit and 36MPH with Juicebox. Wondering if thats the difference or is there something im missing
  2. TexasEV

    TexasEV Well-Known Member

    Jun 5, 2013
    Austin, TX
    If you're charging at 40A you will get about 29 miles of range per hour regardless of the device used. But why would you want to use a Juicebox? You would have to use the J1772 adapter with it. Just take the UMC that comes with your car, plug one end into the 14-50 outlet and the other end into your chargeport.
    • Like x 1
  3. wraithnot

    wraithnot Model 3 VIN #2942 Model S VIN #5785

    Dec 16, 2012
    SF Bay Area
    The Tesla supplied equipment with the NEMA 14-50 adapter and the Juicebox 40 pro should both supply a maximum of 40 amps and therefore charge you car at exactly the same speed. The onboard charger under the rear seat of your car is actually what controls the charging rate and newer cars can charge up to 48 amps so it's possible that your Juicebox is telling your car it can supply 48 amps instead of 40 and you are really charging at 48 amps. I also have a juicebox pro (we have a BMW i3 as well as a Model S) and it looks like you can set the max charge rate higher than 40 amps (with the warning to "Make sure maximum charging rate is within wires and circuit breakers rated limits"). So maybe that's what you are observing. If you set your units to "ideal miles" instead of "rated miles", that might also explain the discrepancy.

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