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"Official" recharge times

Discussion in 'Roadster: Technical' started by TEG, Nov 19, 2008.

  1. TEG

    TEG TMC Moderator

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    #1 TEG, Nov 19, 2008
    Last edited: Nov 19, 2008
    We had pretty much deduced this by doing the math, but here are the "official" numbers of hours to fully recharge a Roadster as seen in the 2008 Roadster owners manual:

    Charge Time / Connection
    4 hours - [email protected] <== Tesla Home Charger
    5 hours - [email protected]
    6 hours - [email protected]
    7 hours - [email protected]
    10 hours - [email protected] <== old RAV4EV/RangerEV "Level II" standard
    15 hours - [email protected]
    18 hours - [email protected]
    20 hours - [email protected]
    40 hours - [email protected] <== Common household outlet



    Interestingly they say you can define different current limits for different locations and it uses the cars GPS to determine if you are parked at a particular charger that you want to have set for a particular current limit.
     
  2. graham

    graham Active Member

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    The manual is saying 4 hours, but I am still hearing the media quote 3.5 hours. Is the manual rounding up? Have Tesla changed their claims?
     
  3. Kevin Harney

    Kevin Harney Active Member

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    Can the charger handle anything over 240/70? Is anything over that possible in a typical US household ?
     
  4. TEG

    TEG TMC Moderator

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    Many US households can't even do that without upgrades.
    I don't think they support anything higher for home use.

    I suspect they have been experimenting with a much higher current commercial fast charge station, but that may require a different connector to the battery pick if they ever do it.
     
  5. graham

    graham Active Member

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    If I recall properly, the cars internal charger can handle higher current, but 70 amps is the biggest circuit you are allowed in a residence in the U.S. Tesla have hinted that it might be possible in the future to have faster recharge times plugging the car in at a business with a bigger circuit. To my knowledge they have not created a wall charger capable of that for businesses yet.
     
  6. tomsax

    tomsax Member

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    Charge Mode

    The times TEG quotes are for the "Standard" charge mode. If the mode is set for maximum range, then the charge times will be "approximately 15% longer."
     
  7. malcolm

    malcolm Active Member

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    Tesla have talked about the possibility of three-phase but a) if you're used to several hours of overnight recharging and b) more power means more energy needed for cooling I can't see any advantages until supercaps get established.

    At present, faster recharging would just damage the batteries: "Avoiding very high charge rates. Charging faster than about C/2 (two hour charge) can reduce the cell’s life."
    Tesla Motors - think

    I'm not sure domestic three-phase will be allowed anyway.
     
  8. dpeilow

    dpeilow Moderator

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    Isn't it already used in pool heaters and Economy 7 heating? I'm pretty sure the electric boiler at an uncle's house is on a 3-phase supply.
     
  9. TEG

    TEG TMC Moderator

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  10. dpeilow

    dpeilow Moderator

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    Fair enough. Three-phase in a house is extremely rare here too, but the difference (as I understand it) is that we have three-phase in the street everywhere, so to bring it into a house is a trivial exercise.
     
  11. vfx

    vfx Well-Known Member

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    I was trying to make a "Miles Charged Per Minute", "MCPM", and a "Miles Charged Per Hour", "MCPH" chart for each of the above.

    That way it will be easy to do the 'top off time' math based on available power sources.

    Are we using the 220 miles or 244 miles per full charge these days?
     
  12. TEG

    TEG TMC Moderator

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  13. Kevin Harney

    Kevin Harney Active Member

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    Aren't most of the 240V services in the US 2 phase ? :confused:
     
  14. Kevin Harney

    Kevin Harney Active Member

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    Ladies and Gentlemen,

    Once again the AMAZING TEG INTERNET MACHINE again !!!! Thanks TEG.
     
  15. vfx

    vfx Well-Known Member

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    Thanks TEG,

    So by the these Tesla numbers, the best "by the minute" charge possible is at 240V, 90 amp feed, 70amp draw, is .25 (1/4) miles of travel for every minute charging.

    The slowest (120V 12Amps) is considerably less per minute..
     
  16. Kevin Harney

    Kevin Harney Active Member

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    no 56 miles per hour is almost 1 mile /minute.
     
  17. TEG

    TEG TMC Moderator

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    #19 TEG, Apr 28, 2009
    Last edited: Apr 28, 2009
    You can just take the bottom entry ([email protected]) from that chart and divide by 4 (1.44kW/5.76kW) to extrapolate for [email protected]

    So,
    20amp breaker, [email protected], ~40hour recharge time, ~4.75 miles added every hour.
     
  18. vfx

    vfx Well-Known Member

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    Right, I was reading it across - as in 56 miles in 3.5 hours. :redface:
     

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