Alternative Power sources - 12 Volt Bi-Directional Fan

Author

12 Volt Bi-Directional Fan

John Smith

2005-08-24, 11:21 pm

Does anyone know where I can get a 12 volt, bi-directional fan with motor?
I am planning on using a solar panel (12 volt) to power the motor and blow
air in and or out of a building.

Thanks.

Ray

pjm@see_my_sig_for_address.com

2005-08-24, 11:21 pm

On Thu, 25 Aug 2005 01:42:47 GMT, "John Smith" <mimn64@hotmail.com>
wrote:

>Does anyone know where I can get a 12 volt, bi-directional fan with motor?

Most of the fans I know are straight.

>I am planning on using a solar panel (12 volt) to power the motor and blow
>air in and or out of a building.
>
>Thanks.
>
>Ray
>

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BobG

2005-08-24, 11:21 pm

How many CFM? Most DC fans are brushless nowadays, but the car and
airplane guys have brushless dc motors and controllers that are really
efficient...

JoeSixPack

2005-08-25, 1:23 am

Jim Baber

2005-08-25, 6:21 am

"John Smith" <mimn64@hotmail.com> wrote in message
Does anyone know where I can get a 12 volt, bi-directional fan with
motor?
I am planning on using a solar panel (12 volt) to power the motor
and blow
air in and or out of a building.

Thanks.

John, I don't know what PV panel you plan on using, and that will make
a difference in the size of fan you can use. I wanted to use a small PV
panel (Kyocera 24W) to run some fans to cool my solar systems
inverters. I used 4 of the muffin fans like you can get in any PC store
for cooling your computer. These are 12 V DC and will run backwards. I
just wired them directly in parallel to the panel. It is capable of
producing 24 VDC but not into the 32 W load of the 4 (8 W) fans.

Not pretty, a little noisy but the fans cost something like $30 for
all 4, and they have been running every day now for 2.5 years. If it is
cloudy or after dark my solar system doesn't need cooling and their
panel shuts them off till morning, no switches, circuit breakers, just
wire, you all know the KISS principle.

Kiwi John

2005-08-25, 9:21 am

i use them in aussie to send air under ground a block of 4 computer fans
can move a bit of air
all so if you throw a car battery in the curcuit and use automotive led
lights they are great for nighttime use for around outside shows where
the snakes and scorpians are also if you add in a computer uv light even
better all scorpians glow under it sorry off topic a bit

"Jim Baber" <jim@baber.org> wrote in message
news:48-dnftS3YLiHZDeRVn-2Q@comcast.com...
> "John Smith" <mimn64@hotmail.com> wrote in message
> Does anyone know where I can get a 12 volt, bi-directional fan with
> motor?
> I am planning on using a solar panel (12 volt) to power the motor
> and blow
> air in and or out of a building.
>
> Thanks.
>
> John, I don't know what PV panel you plan on using, and that will make
> a difference in the size of fan you can use. I wanted to use a small PV
> panel (Kyocera 24W) to run some fans to cool my solar systems
> inverters. I used 4 of the muffin fans like you can get in any PC store
> for cooling your computer. These are 12 V DC and will run backwards. I
> just wired them directly in parallel to the panel. It is capable of
> producing 24 VDC but not into the 32 W load of the 4 (8 W) fans.
>
> Not pretty, a little noisy but the fans cost something like $30 for
> all 4, and they have been running every day now for 2.5 years. If it is
> cloudy or after dark my solar system doesn't need cooling and their
> panel shuts them off till morning, no switches, circuit breakers, just
> wire, you all know the KISS principle.
>
>

DiDo

2005-08-25, 10:21 am

You problem is "bi-directional"
you can get many fan motors that will run in both
direction but fan blades are made for one direction
now you can run the fan backwards but the air flow
drops perhaps to one half of it's capacity
on other hand you can get ac motor that will run
in either direction just by adding reveres switch
Good luck from Dido

"John Smith" <mimn64@hotmail.com> wrote in message
news:rm9Pe.1337$rS4.461@newssvr22.news.prodigy.net...
> Does anyone know where I can get a 12 volt, bi-directional fan with motor?
> I am planning on using a solar panel (12 volt) to power the motor and blow
> air in and or out of a building.
>
> Thanks.
>
> Ray
>

Derek Broughton

2005-08-25, 10:21 am

Jim Baber wrote:

> "John Smith" <mimn64@hotmail.com> wrote in message
> Does anyone know where I can get a 12 volt, bi-directional fan with
> motor?
> I am planning on using a solar panel (12 volt) to power the motor
> and blow
> air in and or out of a building.
>
> John, I don't know what PV panel you plan on using, and that will make
> a difference in the size of fan you can use. I wanted to use a small PV
> panel (Kyocera 24W) to run some fans to cool my solar systems
> inverters. I used 4 of the muffin fans like you can get in any PC store
> for cooling your computer. These are 12 V DC and will run backwards. I
> just wired them directly in parallel to the panel. It is capable of
> producing 24 VDC but not into the 32 W load of the 4 (8 W) fans.
>
> Not pretty, a little noisy but the fans cost something like $30 for
> all 4, and they have been running every day now for 2.5 years.

I use 4 24VDC fans, but on a 12V system so that they run much quieter (of
course, slower, too, but I get the air-flow I need).
--
derek

Ulysses

2005-08-25, 1:21 pm

"John Smith" <mimn64@hotmail.com> wrote in message
news:rm9Pe.1337$rS4.461@newssvr22.news.prodigy.net...
> Does anyone know where I can get a 12 volt, bi-directional fan with motor?
> I am planning on using a solar panel (12 volt) to power the motor and blow
> air in and or out of a building.
>
> Thanks.
>
> Ray
>

You might try this place: www.bgmicro.com/

or www.allelectronics.com/

They (bcmicro anyway) have a good assortment of small fans of various
voltages and sometimes they tell you the current draw.

There was a place called bilsystems AKA pcrightnow that had cheap fans but
they don't seem to exist any more.

My experience with PC cooling fans (brushless type) is that most of them are
not reversible. Apparently some are according to what others said.

~^Johnny^~

2005-08-25, 3:21 pm

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Thu, 25 Aug 2005 08:35:06 -0700, "Ulysses"
<therealulysses@yahoo.com> wrote:

>
>"John Smith" <mimn64@hotmail.com> wrote in message
>news:rm9Pe.1337$rS4.461@newssvr22.news.prodigy.net...
>
>You might try this place: www.bgmicro.com/
>
>or www.allelectronics.com/
>
>They (bcmicro anyway) have a good assortment of small fans of
>various voltages and sometimes they tell you the current draw.
>
>There was a place called bilsystems AKA pcrightnow that had cheap
>fans but they don't seem to exist any more.
>
>My experience with PC cooling fans (brushless type) is that most of
>them are not reversible. Apparently some are according to what
>others said.
>

Space permitting (this is a hack job, right?), I would just put two
axial fans back to back, and energize one at a time for each
direction.

There are electrically reversible axial fans, but their blades are
usually straight pitched and narrow, making them rather noisy and
inefficient in both directions!

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--
-john
wide-open at throttle dot info

refrigeration_man

2005-08-25, 10:21 pm

John Deere used a bi-directional motor on combine condensing units for
the cab air to flush dirt out of the coil.
try a local dealer or ebay

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