22A x 12V = 264 Watts = 0.35HP, call it a 1/2 HP with losses.
If the mechanical fan requires more than 0.5HP the difference is FREE HP
Here is a quote I found regarding a chassis dyno test with a mechanical fan
"First, when I worked for GM, we discovered, on a chassis dyno, that a mechanical fan can draw up to 26 horsepower. Usually something like a seven bladed fan on a clutch, that is...Once the clutch engaged, the hp dropped sometimes as much as 26 hp."
Here is the link:
Two Guys Garage Forum - electric vs mechanical fan
26HP seems very high to me, can't wait to hear from someone who has done a dyno test. Most articles I found indicate 12-15HP
