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How Many kWh in a Full Charge?

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by bilofsky, Jan 2, 2013.

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  1. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Thanks for the data.

    How are you getting the kWh inputs from both L1 and L2 chargers? I assume they are from the wall and they came from the same/similar "measuring device"?
     
    #41 usbseawolf2000, Jan 31, 2013
  2. bilofsky

    bilofsky Privolting Member

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    You mean the kWh consumed as indicated on the dash display? It's accumulating but I haven't tracked it for this period.

    I've been assuming the battery capacity is the issue. But do you think the charge efficiency is changing?

    My concern is that my EV miles have been steadily dropping from 12.3 after it got used to my driving pattern down to the current 9.7, and I'm wondering whether that indicates a drop in battery capacity or just variation with temperature. It's quite a substantial decrease. Unfortunately I don't have measurements from last summer, but I think I was charging at over 3.1 kWh - but can't be certain.
    I've been trying to use all the EV first to see how the EV miles indicated compares with actual miles. But that's another topic. And in any event how a particular charge is used shouldn't affect how it recharges.
    Apparently this is known. I asked about it in this other thread and was berated for not knowing it already. Glad I'm not the only one. :)
     
    #42 bilofsky, Jan 31, 2013
  3. bilofsky

    bilofsky Privolting Member

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    No. 110v data is from a Watts Up, and 240 is from Chargepoint via email. I do not assert that they are comparable. (But since faith-based science is in vogue, I believe they are.)
     
    #43 bilofsky, Jan 31, 2013
  4. 3PriusMike

    3PriusMike Prius owner since 2000, Tesla M3 2018

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    I measured about a 3.5% difference between what my kill-a-watt, Watts up and Smart Meter reported...from about 1340 watts to 1390. (Smart meter: I opened the breaker for cycling loads such as fridge...read meter a few times, start charging, read meter and note the delta. KAW and WU under report compared to the Smart meter)

    Mike
     
    #44 3PriusMike, Jan 31, 2013
  5. bilofsky

    bilofsky Privolting Member

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    SOC only reads in 0.5% increments on Torque Android with my generic Bluetooth OBD-II. Can SOC be read to 0.1%?
     
    #45 bilofsky, Jan 31, 2013
  6. lensovet

    lensovet former BP Brigade 207

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    to address your concern directly, i am willing to bet a dinner (hey, you're nearby) that this is due to temperature changes and NOT due to capacity issues.
     
    #46 lensovet, Feb 1, 2013
  7. devprius

    devprius /dev/geek

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    Apparently the ScanGauge II can. Or at least is giving the impression it can. It's entirely possible that there is some sort of math rounding error going on in the ScanGauge II.
     
    #47 devprius, Feb 1, 2013
  8. devprius

    devprius /dev/geek

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    I think we'll know the answer for sure in about 2 or 3 months when temps have warmed back up.
     
    #48 devprius, Feb 1, 2013
  9. bilofsky

    bilofsky Privolting Member

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    Is your wager based on something you know that I don't - like, you're seeing the same thing? :)

    But just speculating, if the battery could take 25% more charge at 65 degrees than 45 degrees, wouldn't the charging fan be programmed to just let it warm up that much?

    And if it is the temperature, how come my EV miles dropped from 10.1 when it was in the 30s at night to 9.7 now that it's in the 40s?
    Yup.
     
    #49 bilofsky, Feb 1, 2013
  10. chesleyn

    chesleyn Active Member

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    My car switches out of EV at 14.3% SoC (based upon reading my SG2)
     
    #50 chesleyn, Feb 1, 2013
  11. bisco

    bisco cookie crumbler

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    since my ev range went up from april to august, and down from september to february, i believe capacity is temp related. i hope. will capacity be diminished after one year? probably, but i doubt it will be noticeable without historical measurement.
     
    #51 bisco, Feb 1, 2013
    lensovet likes this.
  12. usbseawolf2000

    usbseawolf2000 HSD PhD

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    I am running Torque with Kiwi Bluetooth and it can read 0.1%.

    Here, SOC is showing 59.2%.

    [​IMG]
     
    #52 usbseawolf2000, Feb 1, 2013
  13. usbseawolf2000

    usbseawolf2000 HSD PhD

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    That doesn't seem right. What does it show after a full charge?
     
    #53 usbseawolf2000, Feb 1, 2013
  14. 3PriusMike

    3PriusMike Prius owner since 2000, Tesla M3 2018

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    It can also be that watt-hours requiored per mile goes up when it is colder.
    It takes longer for the cold car and tires to warm up.
    Colder air has more drag.
    More use of seat heaters, headlights.

    So it can be a combination of many things, including the battery chemistry/physics.

    Mike
     
    #54 3PriusMike, Feb 1, 2013
  15. devprius

    devprius /dev/geek

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    Can you post your SG2 Xgauge programming for reading SOC? 14.3% seems awfully low. And do you know what firmware you are running on your SG2?

    I'll pull the same from mine when I go get lunch.
     
    #55 devprius, Feb 1, 2013
  16. devprius

    devprius /dev/geek

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    Here's my Xgauge programming:

    Name: SoC
    TXD: 07E2015B
    RXF: 0441855B0000
    RXD: 2808
    MTH: 03E800FF0000

    Scan Gauge version 3.17 (might be 3.15, forgot to check. Most recent version is 4.02)
     
    #56 devprius, Feb 1, 2013
  17. lensovet

    lensovet former BP Brigade 207

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    just gut instinct and a desire to have an excuse to get dinner with someone lol
     
    #57 lensovet, Feb 2, 2013
  18. bilofsky

    bilofsky Privolting Member

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    Are we comparing different parameters?

    I just realized that I have been looking at the minimum SOC, not the present SOC.

    Looking down the list of Torque parameters, I only saw SOC Min and SOC Max, so selected SOC Min.

    If I'd looked further I would have seen State of Charge and State of Charge (All Bat).

    (What's the difference between these last two?)
     
    #58 bilofsky, Feb 2, 2013
  19. usbseawolf2000

    usbseawolf2000 HSD PhD

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    State of Charge is from standard OBDII mode (01). The other is from Toyota specific mode (21). They both are pretty much the same.
     
    #59 usbseawolf2000, Feb 2, 2013
  20. chesleyn

    chesleyn Active Member

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    Hey devprius, I'm using the same x-gauge. I think it may go as low as 14.3 or 14.6 before the ICE kicks in. Keep in mind it also depends on how much you are asking of the battery. I've gotten as low as 14.3 by nursing it and barely hitting the accelerator creeping through my neighborhood at 20 mph. Sometimes the ICE has kicked on just as I pulled into my driveway.

     
    #60 chesleyn, Feb 4, 2013
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