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THis is really more of a theoretical discussion.
Just wiring the fans to the alternaotr would probably bring some benefit. But the naysayers love to point out that the alternator will drag delivering the load to power the fans.
So my first thought was to have a secod battery to power the fans then charge that battery from the alternator but only when the truck is coasting in gear. That would be some pretty good energy recovery.
THen i thought, maybe the fans themselves could produce charging voltage. If it worked it would be pretty cool.
Solar is an option if it were small, too expensive and ugly to put a big panel on the truck.
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