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

Lowest Observed State of Charge

Discussion in 'Prime Technical Discussion' started by m8547, Sep 9, 2019.

  1. m8547

    m8547 Senior Member

    Joined:
    Aug 8, 2018
    927
    615
    0
    Location:
    Colorado
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    I had Hybrid Assistant running while my car switched to HV mode the other day, and the SoC got down to 8%. It quickly charged back up to 12% after that. In HV mode it seems to be usually between 12-14%. Has anyone seen lower than 8%?
     
    mr88cet likes this.
  2. schja01

    schja01 One of very few in Chicagoland

    Joined:
    Apr 22, 2005
    1,731
    1,154
    0
    Location:
    Chicagoland
    Vehicle:
    2018 Prius
    Model:
    Prime Advanced
    I rarely run the battery down as my trips tend to be short a well spaced to allow judicious wall charging but I have run it down to 0% and 1% on two occasions.
     
    mr88cet likes this.
  3. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    44,768
    16,017
    41
    Location:
    Canada
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    I don’t know the percentage since I don’t have Hybrid assistant but I did run the battery down to what I would’ve considered 2 bars in the old Prii. I was driving in EV Mode up a mountain and when it switched to HV, it was still using the battery during warm-up. Thus, the battery drained down to whatever the minimum is (which is typically the equivalent of two bars in the old car’s). It did look quite empty. I guess with Li-Ion, you could do 1 bar?
     
  4. john1701a

    john1701a Prius Guru

    Joined:
    Jan 6, 2004
    12,747
    5,243
    57
    Location:
    Minnesota
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    That value on the display is USABLE capacity, hence the 0% observed.

    ACTUAL capacity is what the aftermarket app informs us about. In this case, that 8% is reasonable for a high-demand engine start.
     
  5. m8547

    m8547 Senior Member

    Joined:
    Aug 8, 2018
    927
    615
    0
    Location:
    Colorado
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    I don't think there's any reliable way to tell without an app. The car will indicate 0% when it switches to HV mode. And then it no longer displays a percentage but varies between 1-2 bars.
     
  6. 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
    This is the indicated on the dash display, which is showing the in-use range of the battery charge. At 0% indicated, Hybrid Assistant (displaying the actual battery capacity) will show higher (the actual level of charge in the battery). At the high end, a 100% charge on the dash is about 82-83% in Hybrid Assistant.
     
    vvillovv likes this.
  7. m8547

    m8547 Senior Member

    Joined:
    Aug 8, 2018
    927
    615
    0
    Location:
    Colorado
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    In this case I was going up a big hill on the highway as the engine was warming up, so that put a higher than usual demand on the battery. It seems to mostly use the battery as the engine is warming up That makes sense to protect the engine while it's cold, and it's probably also for emissions reasons.
     
    john1701a likes this.
  8. vvillovv

    vvillovv Senior Member

    Joined:
    Mar 19, 2013
    3,493
    1,231
    1
    Location:
    NY
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    Hybrid Assistant consistently shows 84% on my phone, miniVCI, Prime combination. It's not that big a difference, but I think it's clear that there are small variations mostly with the phone. VCI combos being used, but could also be driver based to some degree as well, ie: if the driver uses up EV and lets the car switch to HV consistently while another driver rarely run EV out of EV range for whatever reasons as just one scenario.
    So what might show up on Hybrid Assistant as 8% for one person might show up as 7% or 9% on someone elses phone. Again no a huge difference but something I think we should all keep in mind when comparing stats from the car.
     
    #8 vvillovv, Sep 9, 2019
    Last edited: Sep 9, 2019
  9. noonm

    noonm Senior Member

    Joined:
    Feb 5, 2019
    575
    595
    0
    Location:
    NJ
    Vehicle:
    2018 Prius Prime
    Model:
    Prime Plus
    I run Hybrid Assistant on a tablet in my car and the lowest I've seen is 11%. However, I rarely run till it kicks me out of EV mode.

    I will note that I do see the "kWh used" in Hybrid Assistant continue to go up even in HV mode, so I do know its still using the battery. My guess is that when the battery is that low, it uses some of the engine power to charge the battery back up to its targeted min (looks like in the 12-14% range) rather than moving the car forward.
     
  10. john1701a

    john1701a Prius Guru

    Joined:
    Jan 6, 2004
    12,747
    5,243
    57
    Location:
    Minnesota
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Here's an example the app...

     
    noonm likes this.
  11. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    10,958
    8,836
    0
    Location:
    New England
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Lowest I have seen on HA is 14%, but my sampling number is very small. I don't usually run the app.
     
  12. Flaming

    Flaming Active Member

    Joined:
    Aug 9, 2017
    138
    122
    0
    Location:
    QC , Canada
    Vehicle:
    2017 Prius Prime
    Model:
    Technology
    Lowest I have seen since i use HA is 11 %




    I did not have Hybrid assistant at that time but this happened during my first winter with the car.... the blue portion was half eaten
    maybe this is what 6 - 8 % SoC look like .... who knows ....

    bleu.jpg
     
  13. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    44,768
    16,017
    41
    Location:
    Canada
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    I’ve seen lower lol. That looks to be the equivalent of 4 bars on a old Prius scale.
     
  14. mr88cet

    mr88cet Senior Member

    Joined:
    Sep 9, 2008
    2,306
    1,328
    0
    Location:
    Austin, TX
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    So, is this “Hybrid Assistant” app Android-only? I don’t see it in the iPhone App Store. I do see a few possibly-comparable apps though (haven’t looked at them in detail yet).
     
  15. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    10,958
    8,836
    0
    Location:
    New England
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Yeah, once out of EV range, the scale on the battery is too small to precisely know where they are. After driving Gen3, the first time driving PRIME without EV charge at a dealer for my test drive, I was shocked to see how low the battery level was.
     
  16. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    10,958
    8,836
    0
    Location:
    New England
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Yes, Android only. Hybrid Assistant: App
     
    #16 Salamander_King, Sep 10, 2019
    Last edited: Sep 10, 2019
    mr88cet likes this.
  17. 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
    Yes. I have IOS devices for regular use, but run HA on an old Galaxy S4 tablet. They can be had for cheap.
     
    mr88cet likes this.