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Wall Mounted Charger(s)

Discussion in 'Model S: Battery & Charging' started by Cattledog, Jan 3, 2013.

  1. Cattledog

    Cattledog Active Member

    Feb 9, 2012
    San Antonio, TX
    Is there any reason that, in the future, Tesla wouldn't offer a wall mounted charger for sort of a detuned version of dc supercharging? So someone like me, who opted for the single 10KW charger, would be able to buy, say, a 40KW wall mounted charger in the future that powers directly to the battery? Just wondering why the chargers have to be in the car - they're not for the superchargers, correct? Just wondering.
  2. sp4rk

    sp4rk Banned

    Apr 25, 2012
    Schaumburg, IL
    You mean offer a DC "super" charger for home use?
  3. efusco

    efusco Moderator - Model S & X forums

    Mar 29, 2009
    Nixa, Missouri, United States
    That's an interesting question. I would guess that the main issue would be cost since you're going from a simple power control EVSE type unit to an actually physical charger...and at 40kW you're talking about 200amps I think, so a lot of juice. But why not a 20kW direct DC charger for home use? Same amperage as the current HPWC. Wonder what the logic is there.
  4. Robert.Boston

    Robert.Boston Model S VIN P01536

    Oct 7, 2011
    Portland, Maine, USA
    The question comes down to this: is it more cost-effective to buy chargers and mount them in one physical location (your house), or to buy those chargers and mount them in the car? In a public setting, such as the Superchargers, Tesla thinks it makes sense to mount a lot of chargers in one location. At home, though, you won't need the capacity nearly all of the time.

    Charging at home, you rarely are in a tearing hurry. A 0%-100% SOC charge can be done in about 4.5 hours with twin chargers. Roadster owners report that even that rate is probably more than you'll ever need -- at home. Where you want extra speed is on road trips, but then having paid to install extra charging capacity at home doesn't help you.

    So, short answer: 20kW of DC charging at home means you have installed 2 10kW chargers at home, plus one in your car. 20kW of AC charging at home means you have twin chargers on the car, which is two-thirds the cost PLUS you can charge at up to a 20kW rate on the road. @cattledog's idea, while technically feasible, is likely to be either needed or cost-effective.

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