Battery capacity decrease

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

  1. bowang

    bowang Member

    Joined:
    Feb 6, 2008
    45
    37
    5
    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.
     

    Attached Files:

  2. priuscatprimeguy

    priuscatprimeguy Senior Member

    Joined:
    Nov 1, 2016
    2,730
    2,636
    0
    Location:
    Farmington Hills, Michigan
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    EV range is calculated by your average speed over time, the faster you go the lower your average EV will be over time.
     
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    97,825
    44,389
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    you will get some degradation, especially in the first year. expect 10-15% over 5 years, and just a bit per year after that.
     
  4. Trollbait

    Trollbait It's a D&D thing

    Joined:
    Feb 7, 2006
    17,800
    8,691
    0
    Location:
    eastern Pennsylvania
    Vehicle:
    Other Non-Hybrid
    With a PHEV, the degradation can all be covered by the buffer in the battery. So you might not seen anything on your end.
     
  5. JimboPalmer

    JimboPalmer Tsar of all the Rushers

    Joined:
    Apr 14, 2009
    12,390
    6,780
    2
    Location:
    Greenwood MS USA
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    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.
     
  6. CaliforniaPrius

    CaliforniaPrius Active Member

    Joined:
    Oct 29, 2012
    313
    200
    0
    Location:
    Alameda, California
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    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.
     
  7. giora

    giora Senior Member

    Joined:
    Aug 28, 2010
    1,966
    725
    0
    Location:
    Herzliya, Israel. Car: Euro version GLI
    Vehicle:
    2013 Prius Plug-in
    Model:
    N/A
    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
Loading...