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Model S - HPWC (High Power Wall Connector)

Discussion in 'Model S: Battery & Charging' started by zax123, Nov 28, 2012.

  1. CSFTN

    CSFTN Member

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    Not currently - but it has been stated that the Gen3 (for sale now) have the physical hardware to do so, and the plan is to add this feature to the software, in the future .... no one knows when
     
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  2. FlatSix911

    FlatSix911 Porsche 918 Hybrid

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    Try using an aftermarket app to track your usage and other features... Tesla Stats is one of the best.
    Tesla App | Stats for Tesla (maadotaa.com)
    Stats: For Model S/X/3/Y on the App Store (apple.com)

    Stats for Tesla iOS App [REVIEW] - Drive Tesla Canada

    upload_2021-1-29_19-21-32.png
     
  3. Fiver

    Fiver Active Member

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    Teslafi.com also works well.
     
  4. HankLloydRight

    HankLloydRight No Roads

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    Do these apps show actual grid consumption or just KWh used from the battery? Do they estimate the losses between the wall and the battery? I’d think the OP wants actual mains consumption.
     
  5. Hayseed_MS

    Hayseed_MS Member

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    Yes, it is for reimbursement. How much electricity did I use to charge my car so the company can pay.
     
  6. brkaus

    brkaus Well-Known Member

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    #1746 brkaus, Jan 30, 2021
    Last edited: Jan 30, 2021
    There are lots of old style analog meters for sale online and eBay. Sometimes listed as "RV Park Electric Meters". That would probably be the most reliable. Utilities have switched to digital communicating meters so plenty of old style available.

    teslafi does show power from the wall at a certain location, but I don't know how accurate it would be.

    I have attached a CSV (renamed to txt) of all my charges at a nearby WholeFoods as an example. PM me if you want a code to extend the free trial.
     

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  7. tga

    tga Supporting Member

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    I found this site a while ago. No direct experience, although I was planning to buy a meter and pan from them to monitor charging - Hialeah Meter
     
  8. davewill

    davewill Active Member

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    #1748 davewill, Jan 30, 2021
    Last edited: Jan 30, 2021
    I have one of these. They make much smaller meter boxes than that are hardly larger than the meter. This install was for a program my utility ran. I slapped the meter from Hialeah in there later, after the program ended. You can mount it next to your wall connector and wire through it. You can also get small electronic ones on eBay.

    IMG_20180613_143630.jpg
     
  9. Fiver

    Fiver Active Member

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    Yes they do calculate losses, and if you find them to be inaccurate you can manually change the power factor to correct them. I've found them to be very accurate even when using shore power to preheat the car and battery while charging (which drives charge efficiency way down).

    TeslaFi example:

    Screen Shot 2021-01-30 at 6.14.17 PM.png
     
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  10. HankLloydRight

    HankLloydRight No Roads

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    Right, but to confirm accuracy, you still need a reading of actual power consumed from the wall/grid. Otherwise, it's still just an estimate that could go high or low depending on the efficiency factor.
     
  11. Fiver

    Fiver Active Member

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    I don't have any full scientific tools, but I started with a wifi 40amp Juicebox that had similar online features to TeslaFi and it reported similar numbers, so there's that. I should add in my above screenshot I had cabin heat and battery heat going for 40 minutes of the 8 hour charge, which really drove down the efficiency.
     
  12. morrisdl

    morrisdl Member

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  13. tga

    tga Supporting Member

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  14. HankLloydRight

    HankLloydRight No Roads

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  15. brkaus

    brkaus Well-Known Member

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    It only needs one CT because car charging doesn’t use the neutral. It’s all 240v so the circuit is balanced.

    something like a dryer uses 240 for the heat and 120 for the motor.
     
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  16. davewill

    davewill Active Member

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    #1756 davewill, Feb 1, 2021
    Last edited: Feb 1, 2021
    You only need two if you're measuring a 4 wire circuit with two hots and a neutral, (like inside a panel) where the two legs are not always part of the same circuit. With the EVSE, even if this is a 14-50, all of the current will go through both legs, so we only need to measure one side.

    Looked at mathematically, if you were measuring energy consumed for your whole house you'd measure amperage of both legs and the total watts at any given time would be:

    L1*120v + L2*120v

    With a 240v load, L1 will always equal L2, so the equation simplifies to:

    L*240v

    It's a little more complicated, since we don't use an assumed voltage, but instead measure the voltage between each leg and neutral in the first case. However, that works fine, too if we measure voltage in the second case across both legs.
     
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