Electric Heating (winter driving with Prius Prime)

Discussion in 'Prime Main Forum (2017-Current)' started by john1701a, Oct 28, 2018.

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  1. john1701a

    john1701a Prius Guru

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    I was fortunate enough to have my Prime prior to winter last year, so I was able to capture a few drives as the temperature dropped to share with those curious this year.

    The electric heating in Prime is provided by a vapor-injected heat-pump. That's the most efficient means of cabin warming currently available for electric-only driving. It operates in temperatures down to 15 F degrees. In conditions colder, the engine joins in to help provide warmth.

    So, for most of the winter even here in Minnesota, I get to enjoy EV mode. Of course, when the engine does start, it eventually shuts back off to circulate hot coolant as you drive with only electricity. (Watch that data shown in the second and third videos, indicated by the 2 aftermarket gauges displayed on the right.)


    Here's a video of that electric-only operation at 16 F degrees:




    This is that same drive at a lower temperature, down to 7 F degrees:




    And here's one that even here in Minnesota, we fortunately don't have to deal with often:


     
  2. bensmiata

    bensmiata Junior Member

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    How do you get the battery percentage, and other info to show up? I haven’t seen this option.
     
  3. john1701a

    john1701a Prius Guru

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    Here's a video another owner created to answer that very question:

     
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  4. Lee Jay

    Lee Jay Senior Member

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    I've used the heat-pump without the ICE running down to 10°F, though 12°F is the more common point at which the ICE starts.
     
  5. bensmiata

    bensmiata Junior Member

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    How about the other metrics such as coolant temp and engine RPM? Thanks!
     
  6. Michael King

    Michael King Member

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    I'm interested in that as well, how did he get the coolent and stuff to show up.
     
  7. Lee Jay

    Lee Jay Senior Member

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  8. john1701a

    john1701a Prius Guru

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    The following has a sample of Hybrid Assistant output:



    In the first post, that data was recorded from the "Torque" phone app, which only requires a $10 aftermarket ODB-II reader.
     
  9. bensmiata

    bensmiata Junior Member

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    John,

    Thanks! Which obd-2 reader did you purchase? I'd like this data as well!
     
  10. john1701a

    john1701a Prius Guru

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    This is the one I use to interface with the "Hybrid Assistant" phone-app:

     
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