1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Prime Loses Charge Sitting Unplugged

Discussion in 'Prime Plug-in Charging' started by hcprius, Jul 3, 2019.

  1. jb in NE

    jb in NE Senior Member

    Joined:
    Apr 13, 2018
    2,233
    1,595
    0
    Location:
    Nebraska
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Premium
    1 watt-hour per hour = 1 watt. Typically watt is used as the unit, not watt-hour per hour. Example - 40 watt light bulb, not 40 watt-hours per hour bulb.
     
  2. CharlesH

    CharlesH CA HOV Decal #5 on former PiP

    Joined:
    Nov 27, 2005
    2,783
    1,151
    0
    Location:
    Roseville, CA
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Put another way, watt-hours per hour is (watts * hours)/hours, which is just watts, with the hours cancelling out. "*" means "multiply", for those not familiar with this kind of notation.
     
  3. m8547

    m8547 Senior Member

    Joined:
    Aug 8, 2018
    927
    615
    0
    Location:
    Colorado
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    Ok, I'm fairly sure I saw my battery capacity decline yesterday. At 9am I ran a short errand and got home with about 98 or 99% remaining indicated on the display. Around 7pm I got in and the battery was at 92%, and just leaving my street it dropped to 87%. My street is probably 1/10 of a mile and I drive around 10-15mph, so it usually uses no measurable amount of charge. I did have the AC going, but it should use around 1% or less during the he time it takes to drive down my street.

    It's possible that I sat on my key and held the remote AC button sometime during the day, but I think that's extremely unlikely.

    The battery temperature was probably cool in the morning, and it was around 92F by the time I left.

    I'll have to see if this is repeatable.
     
  4. Rob43

    Rob43 Senior Member

    Joined:
    Sep 24, 2014
    1,373
    1,044
    0
    Location:
    VA, BMW Race Car, BMW R1200R, BMW 330Ci, Ford F350
    Vehicle:
    2013 Prius v wagon
    Model:
    Prime Advanced
    I would recommend on a few of your tests that you re-set Trip A mileage to zero & then drive it under normal conditions till you fully kill the battery. This way you'll have another data point as to whether or not you get your roughly ~25 miles of battery range when done.


    Rob43
     
  5. m8547

    m8547 Senior Member

    Joined:
    Aug 8, 2018
    927
    615
    0
    Location:
    Colorado
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    I made it something like 27 miles (mostly highway) on the remaining 92%, so the range seems fine. What am I looking for specifically?
     
  6. Rob43

    Rob43 Senior Member

    Joined:
    Sep 24, 2014
    1,373
    1,044
    0
    Location:
    VA, BMW Race Car, BMW R1200R, BMW 330Ci, Ford F350
    Vehicle:
    2013 Prius v wagon
    Model:
    Prime Advanced
    That's it, I just figured another data point would be useful.

    ~27 miles of mostly higher speed highway driving sounds very good, you're certainly not really regenerating at 60 or 70 mph like you would be in the city. So ~27 miles is pretty good...


    Rob43
     
  7. m8547

    m8547 Senior Member

    Joined:
    Aug 8, 2018
    927
    615
    0
    Location:
    Colorado
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    I got to work with 51% battery, and it was the same when I left. Most of the time it doesn't lose charge. That's around 30 miles round-trip with the AC on, and I had about 5% remaining when I got home. Around 5 miles of that was drafting behind a truck because I can't quite make the round trip without charging at work if I don't.