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Whole house fan motor | 16 comments (16 topical, editorial)

Re: Whole house fan motor (3.00 / 0) (#3)
by Jeff (ruralmcguyver at yahoo dot com) on Sun Sep 14th, 2008 at 11:21:30 AM MST
(User Info)

You forgot one important detail: What RPM is the stock motor that currently runs it? Based on the 6.6amp 120vac, that comes to 792 watts. That converts to 1hp (1.06 if you want to be picky). There are literally TONS of 12vdc motors "out there", do a google search for 12vdc motors! You may want to sacrifice the RPMs of the AC motor, for a 12vdc one that is A)continuous duty and B)at least 1/2hp at close to the RPM of the AC one, and C) Don't forget that you may not be specifically looking for a 12v motor!
Many people use the 90vdc motors rated at around 1800 RPM and run them on 12v, which uses considerably less amps. Again, search this board for "90v" and "fan" and you'll find several stories of whole-house fans made with that configuration.
I use two of those 90v motors on 12v, and each draws only 4.8 watts (about 0.38-.39 amps). One has a 16" high velocity fan blade on it, and draws the hot air from the cieling to the outside. The other runs a 9-1/2" by 9-1/2" squirrel-cage fan that used to be the blower on my 220vac furnace. This draws cooler air from under my home to the inside. On all but sunny days over about 93degreesF, it keeps it about 80 in here. And there is still much that could be done to make that even a much higher efficiency!

And here's a link to get you started, one of the many places supplying DC motors like mentioned.
http://www.surpluscenter.com/sort.asp?UID=2008091215563525&catname=electric&keyword=MDDD

Good luck
Rural McG

Whole house fan motor | 16 comments (16 topical, 0 editorial)

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