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Posted by JERD on January 7, 2008, 8:48 pm
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>
>> >I have a rotating roof vent that spins it's heart out day and night and
>> >it strikes me this is energy going to waste!
>>
>> Do the rotating fans on nearby houses also spin their hearts out? If
>> yours is the only one, then that indicates a different problem (usually
>> insufficient attic insulation or a broken duct in the attic). If
>> everyone's does it, then ignore this post :)
>>
> Actually, this is not energy going to waste, those rotating roof vents are
> driven by the wind and are sucking air out of the attic, working like a
> pump to create ventilation. This could all be done with a electrical
> powered blower, but it is done with wind power and not wasting energy, it
> is using it.
>
I understand your posting. What I was suggesting that I add a small DC
magnet type 12v motor to it to generate some electricity from the rotation
of the fan - even if it was a 100mA or so.
JERD
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