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Manually warm up battery?

Discussion in 'Model 3: Battery & Charging' started by Sam1, Jan 3, 2020.

  1. Sam1

    Sam1 Member

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    Had a question, and seen someone else with the same inquiry on reddit.

    M3P . Cooler temps, the battery is not nearly as responsive/powerful until (i'm guessing) a certain battery temp is reached. About 50 degrees outside, started at 90% capacity, raced a CTSV at 80%, the CTSV pulled on me when normally the same car loses fairly bad. Car felt underpowered. Run the battery down to 60% the same day, and the car feels like it has more power than it did at 80%. (guessing the batteries had warmed up by then)

    Is there any option to preheat the batteries before leaving the house? Don't really care about consuming electric at the house. Only thing I could think of would be to run the HVAC on high for a while with the windows down... but that's not remotely a good solution.

    Second question: is there any way that we can monitor battery temps realtime?

    Thanks
     
  2. webbah

    webbah Member

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    Yes, use the app and turn climate to HI. You’ll need to do this for 15-30 minutes depending on how cold it is. Maybe longer.

    For monitoring you’ll need to use ScanMyTesla on Android or TM-Spy on iOS. I’m not sure if TM-Spy can see the temps, but I’ll try it out later.
     
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  3. Sam1

    Sam1 Member

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    It seems like it would be more beneficial to just add a battery conditioning option on one of the menus. Instead of having to run the HVAC because that just wears out the HVAC system
     
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  4. JulienW

    JulienW Active Member

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    Heating the cabin doesn't really heat the battery. In fact the Model 3 doesn't have a battery heater the way the S/X do. It uses waste heat from the motors. One way is to Navigate to a Supercharger. This will start the "Precondition Battery for Supercharging". This sends energy to the motors and heats them up and then this waste is used to heat the battery.

    IMG_0640.jpeg
     
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  5. ucmndd

    ucmndd Well-Known Member

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    I hate it when I get caught in those early morning street races with a cold battery. Really cramps your style when you live life a quarter mile at a time.
     
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  6. eprosenx

    eprosenx Active Member

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    There is no way to only pre-warm the battery. The procedure is to turn on the climate control from the app before you leave and the car will prepare them cabin for you and pre warm the battery as necessary. (so it only does it on cold days)

    I see no reason to set the climate control to “Hi”. Just regulate climate control is fine. The battery heating is separate from the cabin heating (but annoyingly the UI treats them as one and the same).

    I pre warm the car this way every day. I actually can hear the high pitched whine slightly when I go outside to the car and it is using the motor for heating the battery. I also can see this behavior on my Sense Energy Monitor graphs. I have a 48a Wall Connector so it is great since it just uses shore power to preheat.

    I also love the new “scheduled departure” feature. The car will delay charging till the early morning in order to try to keep as much residual heat in the battery when you get ready to go. It will also precondition the cabin (and presumably battery?) at the specific departure time (it finishes charging the battery by 6am in order to be nice to the grid).
     
  7. mswlogo

    mswlogo Well-Known Member

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    As @JulienW pointed out the Model 3 does not heat the battery by running cabin heat. It does slightly heat it by putting load on the battery. But it’s not running the motors to heat the battery. Model S/X does heat battery with Range Mode Off.

    Another way to heat it, is scheduled charging but that might not heat it to much depending on your charge rate.
     
  8. webbah

    webbah Member

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    This is false. It does use the motor stators to preheat the battery. This is a function of the magnet based motor vs the Model S and X which have dedicated battery heaters. It is not simply putting load on the battery. Only 2 ways to do this. Navigate to a Supercharger or use the cabin heater control to activate the motor stators.
     
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  9. mswlogo

    mswlogo Well-Known Member

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    We may be both right. Model 3 May heat the battery using motors when preheating cabin to get full propulsion (to remove snowflake). But it will not heat to regain regen (which is what I think most people are thinking).

    Where as Model S/X will heat the battery with its dedicated heater when preheating cabin (range mode off) to get a certain percentage of regen (but not all of it).

    I noticed Model 3 often had a snow flake when I’ve yet to see a snow flake on Model X. But when Model 3 would often have some regen, Model X has absolutely none.

    All models will heat for better charging temperatures.

    Model S/X will heat while driving if Range Mode Off and does nothing special enroute to supercharger.

    Model 3 will heat battery while driving enroute to a supercharger. Not sure if it might heat when snow flake is up. My guess is, it does not. (I think it would display it like it does for supercharger if it did). It always does some natural battery heating from normal driving because motor heat can route to battery.

    I think the mobile app cabin view will show battery heating the same way on all models. With a red battery icon.

    @JulienW

    See here

    Preheating battery in cold weather use.
     
  10. webbah

    webbah Member

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    This is a pretty good video from Bjorn Nyland, however it is mostly about charging in winter and cold battery analysis.
     
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  11. SSedan

    SSedan Active Member

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    And for many of us with the S anyway updates last year killed the battery heating with cabin preheat. Have tickled below zero here already this winter and seen no battery heating outside charging.
     
  12. mswlogo

    mswlogo Well-Known Member

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    I don’t know when it was lost because I’ve not had the X long nor do I like wasting energy and adding unnecessary heat cycles to the battery, so I never preheat the Battery or the Cabin. I normally keep Range Mode on (unless headed to SuoerCharger or car is covered in Ice). But it is confirmed working again by myself and others on 2019.40.50.7.
     

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