DC attic fan motor

[SolarFox]

What he probably wants is one of these: http://www.solartown.com/store/produ...e-30-watt-fan/

I have 2 of them, one sucking and one blowing. Both run on 12v DC.

These are awesome. I got the same set up myself.

[inetdog]

Doesn't a car radiator motor or a portable air compressor motor has brushes and will limit the life of such motor's ?

In general, yes.
The only exception would be the more complex motors that use electronics to supply pulsed DC to multiple windings. (So called brushless DC motor systems.)

[Wy_White_Wolf]

Does any one know how many watt panel to run the 12v radiator cooling fan .

I have one hooked to a 100w panel in my attic. Been there over 3 years now without a problem.

I had full access to a salvage yard and pulled the fan and relay from 4 different cars. Hooked them up one at a time and let them run for 5 minutes and measured the motor temp. I went with the one that had the lowest temp. Wired the relay to a snap switch (on 95F off 85F) and pointed the panel more to the west. It runs from noon tell sunset through the summer.

WWW

[Johann]

Doesn't a car radiator motor or a portable air compressor motor has brushes and will limit the life of such motor's ?

[tandrews]

Those portable air compressors - the little 12v ones that claim 220psi are just geared dc motors.
They will operate with as little as 5v however - at least the one I tested would.
DIY one could be had for 10$, add an rc plane prop and you're blowing hot air with little amperage.
I've hooked one up to a peltier on top of a backup stove, to force air through a vent when stove is running just as those "eco stove fans" work.
Surely a 1w panel would do the same work.

[natel]

I'd love to hear more discussion about using salvage fans with solar panels in your attic. If you can get a fan for $40 and a 80 watt solar panel for $100, that's half the cost of what you would find for a regular 20 watt solar attic fan. The cost savings and extra fan power makes the diy solution so much more attractive to me. I also like the idea of not having to drill a hole in your rough. If you already have a gable vent and can use a remote solar panel, there's no holes that you have to cut, right?

Fan is 80w @ 12v, about 6.7amps
panel is 100w @18v, about 5.6amps

Not exact match but it will still run and pull a lot of air.
That type of fan is a bit noisy though.

Thats a lot of expensive power on your attic.
You could use a smaller version of the fan since it would be running continuously the whole day.
Try searching the salvage yard for cheap DC fans and motors.

[axis11]

Fan is 80w @ 12v, about 6.7amps
panel is 100w @18v, about 5.6amps

Not exact match but it will still run and pull a lot of air.
That type of fan is a bit noisy though.

Thats a lot of expensive power on your attic.
You could use a smaller version of the fan since it would be running continuously the whole day.
Try searching the salvage yard for cheap DC fans and motors.

[caliman]

Does 100w panel work good for this fan:http://cgi.ebay.com/ebaymotors/14-UN...item2567ea30c5

[Mike90250]

Automotive radiator cooling fans pull 10 - 20 amps @ 12V. Way too much for household attic use. There are special purpose, low power fans for that.

[axis11]

I have not done exact measurements on the radiator fan im using. But since im supplying it power from a 15 Vmp, 3.5 amp panel, its working same as when it is on the car. Roughly 50 watts I guess. Fan is from a 96 civic, about 12 inches in dia. If there is a cloud or the sun is low, it would just slow down a bit, but not stop.

[caliman]

radiator cooling fan 12V

Does any one know how many watt panel to run the 12v radiator cooling fan .

[caliman]

$535.00 for an attic fan!!!!!!

I am living San fernando valley,CA and My 180w attic fan run 8hr a day in hot summer = 1.4KWH X 180day/year =252kwh/year x 14cent/kw = $ 35.28/year x 15 years,16 day = $535.00.Man!! not a good idea to go for solar.

[Naptown]

What he probably wants is one of these: http://www.solartown.com/store/produ...e-30-watt-fan/

I have 2 of them, one sucking and one blowing. Both run on 12v DC.

I could say something inappropriate to that
Kind of like Bart Simpson

[satguyjim]

What he probably wants is one of these: http://www.solartown.com/store/produ...e-30-watt-fan/

I have 2 of them, one sucking and one blowing. Both run on 12v DC.

[Jason]

solar attic fan

You may want to consider a solar attic fan. Here is a link to one at SolarTown: http://www.solartown.com/store/produ...c-30-watt-fan/