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Is charge rate slowdown dependent on input charge rate?

Discussion in 'Model S: Battery & Charging' started by hatman4731, Apr 16, 2017.

  1. hatman4731

    hatman4731 Member

    Feb 17, 2017
    Los Angeles
    So we know that charge rate slows down as the car gets close to 100%.

    Does the charge rate slow down as a percentage of the input charge rate, or is it an absolute value? I understand that the supercharger may drop from ~120kw to say 50kw, but will my home charger with a much lower input charge also slow down, considering that it's max speed is slower than supercharger's slow speed?
  2. Rocky_H

    Rocky_H Active Member

    Feb 19, 2015
    Boise, ID
    It is not based on the input charging level. It is just that as the battery is a certain percent full, here is how much charging power it will accept. If the charging source is capable of more than that, then yes, it is being throttled down. If the charging source is lower than that, it will keep running full strength because it is still less than the tapering threshold the car is looking for. So with home charging at 10 or 20kW, that is already so low that the "tapering" level won't even get to that point to have to lower anything until the battery is up to about 98-99% full.
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