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Battery capacity decrease

Discussion in 'Prime Technical Discussion' started by bowang, Jan 28, 2017.

  1. bowang

    bowang Member

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    Anyone also notice battery capacity decrease? And how was battery capacity measured? I calculate from 2 numbers shown on dashboard
    26.4(mile range)/3.8(mile per kWh)=6.9(kWh usable battery capacity)

    A month ago I was able to get 7kWh weather was 10F colder at 60F.
    Assume 24% battery capacity loss in 4 year, that's ~1% loss every 2 month. Which is still not too bad.
     

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    #1 bowang, Jan 28, 2017
  2. priuscatprimeguy

    priuscatprimeguy Senior Member

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    EV range is calculated by your average speed over time, the faster you go the lower your average EV will be over time.
     
    #2 priuscatprimeguy, Jan 28, 2017
  3. bisco

    bisco cookie crumbler

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    you will get some degradation, especially in the first year. expect 10-15% over 5 years, and just a bit per year after that.
     
    #3 bisco, Jan 28, 2017
  4. Trollbait

    Trollbait It's a D&D thing

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    With a PHEV, the degradation can all be covered by the buffer in the battery. So you might not seen anything on your end.
     
    #4 Trollbait, Jan 29, 2017
  5. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    I think you are measuring the computers more correctly reporting your driving style.

    At first they use ideal ranges, but they learn your actual range over time.
     
    #5 JimboPalmer, Jan 29, 2017
  6. CaliforniaPrius

    CaliforniaPrius Active Member

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    Wow, so 0.5 kwh per month. By this assumption, you won't have a prius in 6.9/0.5=15 months. Less than 1.5 years. My condolences.
     
    #6 CaliforniaPrius, Jan 29, 2017
  7. giora

    giora Senior Member

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    It's really too early to make any statement. You need much more time/miles to notice any degradation. Don't worry now and enjoy.
    Just the way the numbers are displayed (truncating to first decimal place) can lead to opposite results of 6.9 kWh last month and 7 kWh now.
    Example: 26.4 miles could be anything from 26.40 to 26.49! then 26.49/3.8=6.97 kWh.

    If you really want to monitor your battery degradation in time and use, the best accurate way to do it is to install kWh meter (counter) on the line feeding the car.
    If you do that, take measurements of kWh (consumed from wall) per full charge now:
    1. At various ambient temperatures.
    2. From same starting point (say, always from 0.1-0.2 EV miles remaining or 0.6-0.7 remaining or whatever).
    Repeat these measurements a year from now and compare.
     
    #7 giora, Jan 29, 2017
    Last edited: Jan 29, 2017
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