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Charging times

Discussion in 'Model S: Battery & Charging' started by modelx007, Jan 11, 2016.

  1. modelx007

    modelx007 Member

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    Hi,
    I know I saw somewhere sometime ago a chart that shows different charging times and of course I can't find it now.

    Ie,
    48 amps gives 28 miles
    20 amps gives x miles
    110 gives x miles
     
  2. CLLACAB

    CLLACAB Member

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    I can tell you that my Nema 14-50 on a 50 amp circuit that charges at 40 amps (80%) gets me about 28/29 miles per hour. I also have a Level 2 charger that I use on my Volt. Before I put in the Nema, it charged at about 21/22 miles per hour. Not sure of the size of the circuit it is on.
     
  3. InternetDude

    InternetDude Member

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    It depends on the voltage.
     
  4. Mike K

    Mike K Member

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    It depends on amperage but best case scenario for 110v/ 12a is generally 4 miles per hour and 240v/ 40a+ is 29. Both of these are on the mobile charger. If your car is equipped with dual chargers, you're using the high power wall connector and you have 80+ amp service you can get 60 miles per hour.
     
  5. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    A good rule of thumb is 3 rated mph per kW for AC charging. That includes AC to DC charging losses. To finesse it, then subtract 1 mph for inefficiencies.

    So use V*A*3/1000-1

    Some examples:

    120V*12A*3/1000-1 = 3.3 mph or about 3 mph
    240V*40A*3/1000-1 = 27.8 mph or about 28 mph
    208V*40A*3/1000-1 = 23.0 mph or about 23 mph

    For simplicity, kW*3 works well. Subtract 1 for finesse, mostly important at low powers like 120V charging.

    Have Fun!
     
  6. AWDtsla

    AWDtsla Active Member

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    You're not going to get 4mph out of 110V @ 12A.

    - - - Updated - - -

    Too generic not accounting for the car. 70D has a different Wh/RM than a P90D, so will charge faster in terms of rated miles.

    The equation is more like:
    (V*A*efficiency-fixed_overhead)/(Wh/RM)

    I haven't solved for all the numbers yet. But Wh/RM is known for your whatever car you're in.
     
  7. modelx007

    modelx007 Member

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    Let's go with:
    Model S 90D
    Model X P90D

    For formula.
     
  8. Mike K

    Mike K Member

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    Well, I'm plugged into a standard outlet right now getting 4 miles per hour.
     
  9. AWDtsla

    AWDtsla Active Member

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    It's rounding up. It's probably 3.6. Try VisibleTesla or Remote S with high precision turned on. I think a 70D with no voltage sag (~120V+) should be able to get closer to an actual 4.
     
  10. boonedocks

    boonedocks Active Member

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    My Tesla reports 231V / 79 Amps and 56 miles per hour in miles = 18Kwh
     
  11. Max*

    Max* Charging

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    No, best case scenario is 31mph. Though I guess I had 245V at the moment...

    Screenshot_2015-12-05-13-02-29.png

    Sure you are (well rounded to 4), I've charged on 120V for a few months before finally decided I might need a NEMA 14-50 (I have a short commute and charger at work). Though I was getting 124V I think.

    - - - Updated - - -

    Nevermind, we agree.
     
  12. supratachophobia

    supratachophobia Active Member

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    Yes it does. So actually, 220v @40amp will do 28 mph / 230v @ 40amp will do 29mph / 240v @ 40 amp will do a solid 30mph
     
  13. FlatSix911

    FlatSix911 918 Hybrid

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    Here is the chart supplied with the HPWC to indicate the charging time and range based on your supplied current in Amps :cool:

    charger.JPG
     
  14. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    Great chart! Thanks!

    Remember, that chart is for 240 Volts. When the charging Voltage is 208 Volts (very common at commercial locations), scale by 208/240, 13/15, or 0.866..., all the same value. For example, at 80 Amps and 208 Volts, the charge rate is 58*0.866 or 50 mph.
     
  15. AWDtsla

    AWDtsla Active Member

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    Highly idealized either way.

    I don't know how many people are actually getting rated voltage, but it's rare when I get close to that. I see 7-8V drop @240, almost all which is on the utility side of the meter. When charging at 208 at work it drops to 199-200V. Actually I've been charging all day on a 120V/20A socket (because their are so many of them), which immediately drops down to 12A due to voltage drop, and is current running 100V/12A.

    So consider yourself lucky if you get rated voltage, basically.
     
  16. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    That is exactly correct. I was just providing simple guidance.

    At my homes, I have "stiff" electrical feeds, and often start at about 245 Volts that drifts down to 239 Volts or so; close enough for me. When my solar panels are at full power, I often see 241 or 242 Volts while charging at 80 Amps, but then again, they can produce about 90 Amps at 240 Volts in full sun.

    At one hotel where I stayed with an 80 Amp HPWC, the Voltage started at 207 Volts, but sagged to 198 pretty quickly. 198/240 is 0.825 or 17.5% less charge rate than the ideal 240 Volts.

    If you really want to have a close estimate, use the table above and scale by actual Volts over 240 Volts. If the current does a 25% rollback, reduce the rated mile charge rate by another 25%.
     
  17. Mike K

    Mike K Member

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    You bolded the part of my post that you disagreed with but missed the part where I said "generally" this is what you can expect. 29mph is generally what most see on 240/ 40amps and it's the figure Tesla uses.
     
  18. Fuma586

    Fuma586 Member

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    I charge on "240v" 3phase and I only get 24 mph but that is because during certain hours I only get 200v instead of the full 240v.

    I suspect this is do to high electrical usage in the industrial zone my office is located in.
     
  19. Max*

    Max* Charging

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    I generally don't like incorrect "best case scenarios".
     
  20. AWDtsla

    AWDtsla Active Member

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    Again, specifying how many mph you get without specifying what car you're charging is futile. There's now 8 different rated miles.

    I usually get 27 mph at 40/240, saw a 28 maybe once.
     

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