what happens if i run a 12v DC fan from a 110v AC plug?

Reply

  #1  
Old 01-24-11, 03:26 PM
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 6
what happens if i run a 12v DC fan from a 110v AC plug?

Start off by stating how dumb I am. I bought a fan labeled "Shop Exhaust Fan" suposed to be 3000 CFM for only $30 + shipping. I failed to realize what 12v DC implied...so I am wondering what will happen if I splice this motor to a plug and just plug it into the wall...for 4-8 hrs out of the day?


thanks
 
Sponsored Links
  #2  
Old 01-24-11, 03:28 PM
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,533
It'll burn up in a couple seconds. You should be able buy a suitable DC power supply for a reasonable price to use with this fan. Does it have a current rating in amps or milliamps?
 
  #3  
Old 01-24-11, 04:13 PM
ray2047's Avatar
Group Moderator
Join Date: Mar 2006
Location: USA
Posts: 33,125
Something doesn't sound right. A 12v DC fan for a shop exhaust? Why would a shop fan be 12v? A 12v dc fan that moves 3000 CFM? Neither of these sounds like the specs on a 12v fan. A 120v bath exhaust fan for instance only moves 50-200 CFM. Can you tell us how large this fan is? Can you post a couple of pictures including a clear shot of the name plate? http://forum.doityourself.com/electr...your-post.html
 
  #4  
Old 01-24-11, 04:34 PM
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 6
ray2047,

well .... I am guessing that the person who sold it to me, sold me a radiator fan as an exhaust fan...it's a 16 in fan....I called the guy who sold it , asking him WTF is this? he said I could get an 110v AC/ 12v DC converter and that it needed max amp of 20. I went to radio shack and bought a wall plug in 110v ac - 12v dc converter w/ 500mA...I assumed 500 mA meant 500 max amp...but it provided no power to the fan...I'm now thinking it is 500mA = .5 max amp..I will go take a picture and post it. thank you for the responses..
 
  #5  
Old 01-24-11, 04:38 PM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,030
How about a model/brand or what it says on the label (if there is one?). 20A is pretty high for a fan....but 500mA is pretty low for that size. A mid size battery charger might run it...
 
  #6  
Old 01-24-11, 05:02 PM
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 6
[/IMG]

There is no name plate...sticker just says 12v dc and has an arrow indicating direction of the fan blades when spinning.
 
  #7  
Old 01-24-11, 05:05 PM
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 6
Originally Posted by Gunguy45 View Post
How about a model/brand or what it says on the label (if there is one?). 20A is pretty high for a fan....but 500mA is pretty low for that size. A mid size battery charger might run it...
I think I was told it needed the 20 amp for start up....but runs on 10 or 15....and now I am going to assume that (mA) stands for milli-amp.
 
  #8  
Old 01-24-11, 07:09 PM
Justin Smith's Avatar
Member
Join Date: Dec 2010
Location: Cressona, Pa, USA
Posts: 2,546
A battery charger/starter should do the trick, and harbor freight has them. They also work great for electrolysis.
 
  #9  
Old 01-24-11, 07:50 PM
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,533
mA is millamp (0.001 amp). That is the unit you would find on a much smaller fan like the type used to cool computer cases. A large fan like that would need a lot more power.

Best thing would just be to cut your losses on this one and get a 120V fan. Return it if you can. A good alternative would be to use an attic gable fan -- should be less than $100 at Lowe's or Home Depot.
 
  #10  
Old 01-24-11, 09:11 PM
ray2047's Avatar
Group Moderator
Join Date: Mar 2006
Location: USA
Posts: 33,125
Did you pay through PayPal. I would complain to Ebay and Paypal. If this product was sold as a shop exhaust fan it was misrepresented. You can probably get your money back.

Curious do you have the URL for the Ebay listing.
 
  #11  
Old 01-24-11, 10:18 PM
Member
Join Date: Dec 2006
Location: usa
Posts: 1,365
Originally Posted by surfkiva View Post
[/IMG]

There is no name plate...sticker just says 12v dc and has an arrow indicating direction of the fan blades when spinning.
Its a car radiator fan. Like said if you got it off of ebay i would take it up with ebay or paypal all else fails leave negative feedback unless the guy who sold you it didn't know what it was either.
 
  #12  
Old 01-24-11, 10:55 PM
Member
Join Date: Mar 2006
Location: NE Wis / Paris France{ In France for now }
Posts: 4,808
That is car raditor fan and it is not a constant duty motour at all.

It will be wise to concat where you order it from Ebay or other place and expain the situation and that is misrepentstive on this product.

Wall Gable fan will work just fine due they are rated for constant duty and there are couple other constat duty rated fan around as well and make sure you have shutter screen to close it up in cold weather.

However let me empiszed you this one if you going to use this { exhaust fan } to remove paint fumes just don't go there with this type of fan so that is the other head up you have to watch out.

Merci.
Marc
 
  #13  
Old 01-25-11, 12:11 PM
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 6
Originally Posted by ray2047 View Post
Did you pay through PayPal. I would complain to Ebay and Paypal. If this product was sold as a shop exhaust fan it was misrepresented. You can probably get your money back.

Curious do you have the URL for the Ebay listing.
12 V Volt DC HVAC Industrial EXHAUST FAN vent blower - eBay (item 290517607891 end time Jan-06-11 18:26:32 PST) is the URL for the auction I won..

12 V Volt DC HVAC Industrial EXHAUST FAN vent blower - eBay (item 290526503516 end time Jan-30-11 21:44:54 PST) is a URL for another auction of the same fan.
 
  #14  
Old 01-25-11, 01:47 PM
ray2047's Avatar
Group Moderator
Join Date: Mar 2006
Location: USA
Posts: 33,125
Well it did say 12V DC. I do question the rest of the description. I can't imagine an industrial HVAC application that would be 12v DC. Maybe somebody will correct me. This guy seems in my opinion to be totally ignorant of the device he is selling. I'd write him to ask in what industrial application a 12v DC fan would ever be used for HVAC.
 
  #15  
Old 01-26-11, 12:51 PM
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 6
I did in fact complain to Ebay..The seller gave me a full refund after I esculated the case!! Thank you for the responses!
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes