Estimated EV penalties for various heating cooling and lights

Discussion in 'Prime Fuel Economy & EV Range' started by Skylis A, Nov 21, 2017.

  1. Tideland Prius

    Tideland Prius Moderator of the North
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    Hopefully @Oniki will explain further.
     
  2. vvillovv

    vvillovv Active Member

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    If you've seen the gauges for the heat pump you'll begin to understand more about how much energy it uses (real world calc) as opposed to a percentages conpared to spec. Like in the PIP the A/C reduces EV range considerably, especially when ambient temps are high. And it's even more noticeable when one is trying to cut EV range spec real close (wants to see how far it will go on available EV range) I'm running the heat pump in a warmup cycle and watching the EV range and timing the loss. ( That is my use case ) [ skylis ] , did a real good job of explaining his ( use case ) even tif I don't get all of it .....
    My use case has a few more variables that I use as my { standardized use case ] for my own calculations. They are [ambient temp] and the dash gauge that shows Heat/AC efficiency when running either heat or A/C.

    As for the pumps efficiency it's pretty good depending on how good you want it to be. The gauge will show you where it's max heat/AC efficiency is for heat/AC ( temp, fan speed. and driver or all passenger priority) settings.
    For example yesterday I had 25.1 miles EV range after I had the heat pump running for 10 minutes or so while I shoveled the driveway.
    I started my route on a slight uphill grade 40 mph a few miles to hwy 60 mph mostly with some 65 mph in heavy traffic. Snowing, 32 F, lights on, wipers on, heat on intermittently at max efficiency setting ( the same way as I run the heat pump warmup cycle ). I got off the hwy after driving 17 miles with 2.2 EV range left showing.

    There other stuff going on besides. snow melt moisture inside fogging up windows, watery/salt slush killed front radar, etc.
     
  3. vvillovv

    vvillovv Active Member

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    Prime - One thing I'm still not positive about is if using cabin heat reduces EV miles generated by charge mode. And if yes than what is the efficiency curve for using Heat A/C while in charge mode.
    My initial real world calc for the heat pump on, at what the computers say is the most efficient setting, I see ( 1/10th an EV mile loss per 1 minute 11 sec) give or take - during warmup mode with ICE off - ambient temps below freezing.

    I wish I had premium or advanced so I could use the heat pump with plugged in - and another variable for the users standard calcs
     
    #23 vvillovv, Feb 11, 2018
    Last edited: Feb 11, 2018
  4. Oniki

    Oniki Active Member

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    Depends on the ICE temperature. If you drive with an App that lets you monitor ICE temperature you will know when there is waste heat available. Hint: when the ICE is warm.
     
  5. benagi

    benagi Active Member

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    Looks like I took my biggest hit on EV miles today. I have been avg around 35 EV. Today it got up to 97 degrees here in Salt Lake, so I ran the a/c quite a bit. My lowest EV miles today since I owned the car (6 mos) was 23 miles . Ouch
     
  6. Salamander_King

    Salamander_King Senior Member

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    You mean, worse than the coldest winter day?
     
  7. benagi

    benagi Active Member

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    Yes
     
  8. Salamander_King

    Salamander_King Senior Member

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    My best range so far has been 36.6 miles on EV but this was without any A/C or heat during nice weather last latte summer. I usually range around 32 miles EV without AC or heat when temp is above 40F, but during winter when the day high temperature stayed in teens, it dropped below 18 miles.:(
     
  9. benagi

    benagi Active Member

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    I have to admit, I drove most of the winter without heat but did use the steering and seat heaters. Didn’t get quite as cold this year as other years here in northern Utah.
     
  10. KMM

    KMM New Member

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    Do the power windows draw from the EV battery or the 12V ? I like to lower the windows when on regular streets after getting off the highway but I'm wondering what draw that takes.
     
  11. walterm

    walterm Active Member

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    As long as the car is in READY mode the 12V battery isn't providing power to anything, the 12V accessories get their power from the main hybrid battery (stepped down, of course).
     
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