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efficiency of DC charging vs. AC charging

Discussion in 'Model S: Battery & Charging' started by MartinAustin, Aug 17, 2015.

  1. MartinAustin

    MartinAustin Active Member

    Jul 21, 2013
    Austin, Texas USA
    Not sure if this has been covered yet... Tesla says their in-car charger has an efficiency of 92%. Meaning, if you add 20kWh to your battery SOC then you actually drew 21.74kWh from your AC supply (and will pay accordingly for that)

    Does anyone know if Supercharger or Chademo DC charging is any different? Still the 92% efficiency... or perhaps better?
  2. Oba

    Oba Member

    Jun 7, 2015
    Since the Supercharger merely takes 12 of the same 10kW charger(s) that are in your car (Japan and North American market... China and Europe use a different three phase charger), the efficiency from AC power to your battery should be nearly identical.

    if you're measuring the efficiency at your vehicle's inlet, then of course, straight DC into the battery (97-99% efficient) will be better than the AC power, through a charger, converted to DC, and then put in the battery.

    From the grid to your car, the efficiency is roughly the same with DC or AC charging. CHAdeMO would obviously be quite similar to Tesla Supercharger in terms of efficiency, however, CHAdeMO is a protocol, not an individual charger that could be built with ANY efficiency %.

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