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Originally Posted by Habanero
The same is true of the mechanical fans, if the clutch is working right. Only when it heats up and engages does it actually draw any power.
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A friend of mine dyno'd gains on his truck between an unlocked clutch fan and a locked one. Pulling the unlocked fan with clutch yielded him appx 7rwhp yet over a locked clutch gained 17rwhp!
Pulling 5-7A at low speed from the alternator would draw nearly no power and even at a full load of 20A on a good fan, that's going to be similar to having your headlights on with your stereo.
Remember... you can fully turn off e-fans to there is no drag on the motor or alt.