12v battery power consumption

30 to 40 milliamps is what I recall.

 

<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.

 

<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?

 

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.

 

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

 

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