Playing around with a space heater and Hybrid Battery Intake/Fan

Discussion in 'Gen 3 Prius Technical Discussion' started by PacificCornhusker, Jan 22, 2025 at 2:00 PM.

  1. PacificCornhusker

    PacificCornhusker Junior Member

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    Nebraska
    Vehicle:
    2012 Prius
    Model:
    Two
    The last couple days I've messed around with put the Prius into ACC-Mode and running a space heater directly pointing into the Hybrid-Batt fan-intake port.

    Through Hybrid Assistant, the "Auto" setting on the fan goes to "3" and seems to auto heat the battery even though the cabin temp is WELL below freezing.

    Intake temp is reading at ~83F, and battery started at ~12F. Looks like 30F now.

    Anybody know what the temp/why the computer wants to heat up the battery?

    Yesterday I kept it all running while turning on the car and I believe it shut off the intake fan, for 10-20 seconds, then turned it back on.

    Anybody know @ what temp the hybrid-battery-vent-intake-fan will kick off?

    This is all just to see, out of curiosity, etc.
     
    #1 PacificCornhusker, Jan 22, 2025 at 2:00 PM
  2. PriusCamper

    PriusCamper Senior Member

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    Vehicle:
    2007 Prius
    Model:
    Two
    Does Hybrid Assistant run the cooling fan in ACC mode? I thought it would only do that with the car in Ready mode?

    But basically in sub freezing temperatures the battery ECU is going to limit how much the hybrid battery is used because using this battery type in super cold temps can shorten its lifespan, same goes with Lithium, but sodium-Ion is fine. Most modern Lithium powered cars have a thermal management system because Lithium performs way better at the perfect temperature.

    Whereas temperature doesn't matter as much with OEM battery, though about 97' F is where you'll have the very best performance from your pack.
     
    #2 PriusCamper, Jan 22, 2025 at 4:49 PM
  3. Grit

    Grit Senior Member

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    Love how sodium and lithium is brought into the post while the post is stock battery. Makes no difference nor affects OPs approach to heating.
     
    #3 Grit, Jan 22, 2025 at 11:57 PM
    MAX2 likes this.
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