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Slow mi/hr ramp up

Discussion in 'Model 3: Battery & Charging' started by jtpassat, Jun 4, 2018.

  1. jtpassat

    jtpassat Member

    May 26, 2015
    Providence, RI
    I’m using the gen 2 mobile connector plugged into a Nema 6-50 with 50 amp breaker behind that. When I first plug in, the mi/hr is around 15 and it takes close to an hour before it ramps up to 29 mi/hr. Anyone else experience this?

    I plugged it to my j1772 unit and it was able to go straight to 29 mi/hr within 10 minutes.
  2. Rocky_H

    Rocky_H Well-Known Member

    Feb 19, 2015
    Boise, ID
    #2 Rocky_H, Jun 5, 2018
    Last edited: Jun 5, 2018
    The probable reason for this has to do with a weird thing Tesla does with their measurements. The charging rate in kilowatts is an instantaneous reading, but the miles per hour number is an average over the course of the whole charging session. So during that first minute or two as it is testing out the voltage and then slowly raising the current, has really slow charge rates, which are still included in the average for the rest of the session, making it look artificially low for the first 5-10 minutes until the larger amount of data from the rest of the charging time makes it look more normal.

    So if you want to check your charging rate for real, make sure to look at the kW number. That applies for all kinds of charging, including Superchargers. The miles per hour number is going to look weird for the first few minutes, because it includes that ramp-up slow time.
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