
Originally Posted by
pete376403
yes it does - otherwise we could all have lawn mower engines out in the backyard driving big fuck-off alternators that power the whole house, including the spa pool heater and a kiln for pottery.
You can't get more watts out of the alternator than you put in so you add another 200 or so watts of lights (thinking car here, 2 headlights, 2 sidelights, tail lights, etc) thats 200+ (approx 1/4 hp) more watts that the engine has to provide - and that means more fuel consumed
Apparently you misunderstood my meaning. Of course you can not take out more power than you put in.
My point was that the mechanical power required by the engine to run the alternator does not vary with the amount of power being drawn by the electrical system.
If the alternator produces less electricity than the car uses the battery will drain. If the alternator produces more electricity than the car uses the battery is being charged. Obviously you'll design a car so that there's a sufficient amount of surplus electrical power being generated.
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