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12v battery power consumption

Discussion in 'Gen 2 Prius Technical Discussion' started by psibill, Jul 1, 2006.

  1. psibill

    psibill Junior Member

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    When the 04-06 Prius is off and "at rest," how much power is drawn from the 12v battery to keep all the electronics working and monitoring, etc.

    I expect the power drain to be different depending on which factory options are installed, so let's just ask about the top package with all the goodies.

    Thx.
     
  2. tochatihu

    tochatihu Senior Member

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    30 to 40 milliamps is what I recall.
     
  3. mrbigh

    mrbigh Prius Absolutum Dominium

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    <div class='quotetop'>QUOTE(Bill-psi @ Jul 1 2006, 01:38 PM) [snapback]279736[/snapback]</div>
    The Stand-By battery load should be under 50mA with out SKS and about 85mA with it. ;)
     
  4. Cheap!

    Cheap! New Member

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    <div class='quotetop'>QUOTE(mrbigh @ Jul 1 2006, 08:14 PM) [snapback]279868[/snapback]</div>

    So if you could replace that energy while the car is quiet, would the ICE stay off longer?
     
  5. mspencer

    mspencer New Member

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    85 mA at 12 volts is about one watt.
    One horsepower is about 745 watts.
    If an engine outputs 118 horsepower for one second, it will have outputted enough energy to power a one watt load for 24 hours.
    So: theoretically yes, but measurably probably not.
     
  6. ConservationMatters

    ConservationMatters New Member

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    Can someone explain to me how much battery energy, in watts, it takes to drive Prius. If i am driving a constant 35 mph on level ground for 1 hour; can you compare the Prius energy consumption to that of (household) light bulb energy ? ? ?
    Thanks
     
  7. andrewclaus

    andrewclaus Active Member

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    If you assume 20 hp of engine output (just a SWAG*), that's about 15 kW. If your light bulb is 100W (that's a bright bulb, but it makes the math easier), that's 150 light bulbs. If you drive for an hour, the energy is about that consumed by 150 light bulbs burning for one hour. If you pay $0.10 per kWh, that would cost $1.50.

    Engine output is going to depend a lot on wind direction and tire pressure at that speed. Try riding a bicycle at 35 mph and you'll see.

    * Engineering acronym for silly, wild-assed guess in back-of-envelope calculations like this one