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My Prius Plug In Charges only 2.7 Kwh

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by Goks, Jul 30, 2014.

  1. Goks

    Goks Junior Member

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    Hello,

    I have a 2013 Prius Plug - The car is not charging fully i.e. 3.2 KWHs was many claim and have written in several forums and blogs. It has consistently been charging only unto 2.7 KWHs. I bought this last summer and its been more than a year and have seen all the four seasons. Obviously the number of miles it can run with a full charge varies depending on weather and all that. But I am not able to understand why it is not charging beyond 2.7 kwhs. I had asked this question to the dealers during the services but they don't have an answer besides saying that the 'battery seems to be good'. Any thoughts?
     
    #1 Goks, Jul 30, 2014
  2. john1701a

    john1701a Prius Guru

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    That's quite normal. I've been seeing an average of 2.75 from the ChargePoint app.
     
    #2 john1701a, Jul 30, 2014
  3. mrbigh

    mrbigh Prius Absolutum Dominium

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    It is a normal re-charging capacity with the EVSE.
     
    #3 mrbigh, Jul 31, 2014
  4. bisco

    bisco cookie crumbler

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    3.2 is max capacity, but the software limits it to 2.7 for max battery life, you're all good!(y)
     
    #4 bisco, Jul 31, 2014
  5. CaliforniaBear

    CaliforniaBear Clearwater Blue Metallic

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    I've been keeping a record of estimated battery capacity based on SOC change, Charge kWh and an assumed charging efficiency of 90%. As you can see from the chart it shows a decline in amount of energy to charge and a decline apparent battery capacity. I'm not sure why there is variability in the data, perhaps the actual battery charging efficiency varies with temperature.
    [​IMG]
     
    #5 CaliforniaBear, Jul 31, 2014
    Last edited: Jul 31, 2014
  6. CaliforniaBear

    CaliforniaBear Clearwater Blue Metallic

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    Maximum SOC 85%, approximate Minimum SOC 20% (3 bars), Battery specification 4.4 kWh full capacity
    (.85 - .20) * 4.4 = 2.86 kWh available capacity.
     
    #6 CaliforniaBear, Jul 31, 2014
  7. bisco

    bisco cookie crumbler

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    thank you.(y)
     
    #7 bisco, Jul 31, 2014
  8. rxlawdude

    rxlawdude Active Member

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    I wonder if some of the confusion is the built-in charger capacity (3.3kW/h) vs. actual charging energy used (2.8'ish kWh)?
     
    #8 rxlawdude, Jul 31, 2014
  9. PriusC_Commuter

    PriusC_Commuter Active Member

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    I think you have an extra "/h".
    The charger is 3.3 kW (although I see 1.9 kW with 240v in the car or 2.3 kW on Chargepoint Usage).
    The total capacity (not usable) is 4.4 kWh.
    The average amount charged seems to go up to 2.8-3.0 kWh, plus charging losses (about 10-15% I believe).
     
    #9 PriusC_Commuter, Jul 31, 2014
  10. Goks

    Goks Junior Member

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    Hello Everyone. Thank you so much for taking the time to clarify on my question. I think all this information has given me more clarity.
    It is really sad that the Toyota dealers and the technicians there are not able to give this kind of information.
     
    #10 Goks, Aug 1, 2014
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