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Are two 12V fans on one molex safe?


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#1 jonathanmrk

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Posted 19 June 2017 - 03:06 AM

Are two 12V fans with two different amps on one molex safe?

Two red wires from the fans go to the yellow wire of the molex.

Other two black wires of fans go to the black wire next to yellow wire of the molex.

Besides, can power supply handle two SATA hard disks and two 12V fans on its own?

(this set up is not yet soldered and will be soldered and all the ends will be wrapped safely before booting the system)

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Edited by jonathanmrk, 19 June 2017 - 03:17 AM.


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#2 jonuk76

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Posted 19 June 2017 - 03:27 AM

It's "safe" in as much as two fans which typically draw a fraction of an amp, won't come close to overloading the wiring or the PSU. With proper wiring you could safely run many more than two fans off one PSU Molex connector.  Whether it is safe or not in the end depends on the quality of the connections, and whether they are properly insulated. Any chance of exposed wiring creating a short circuit would be bad.  Heatshrink tubing makes for a more secure and durable insulation of joins than electrical tape, IMO.


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#3 jonathanmrk

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Posted 19 June 2017 - 05:15 AM

It's "safe" in as much as two fans which typically draw a fraction of an amp, won't come close to overloading the wiring or the PSU.


How to know that beforehand?

Edited by jonathanmrk, 19 June 2017 - 07:21 AM.


#4 jonathanmrk

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Posted 19 June 2017 - 05:20 AM

Pls anyone?

Edited by jonathanmrk, 19 June 2017 - 07:17 AM.


#5 jonathanmrk

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Posted 19 June 2017 - 07:20 AM

Urgent

Edited by jonathanmrk, 19 June 2017 - 07:23 AM.


#6 mikey11

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Posted 19 June 2017 - 07:33 AM

dude its fine quit worrying,

 

that one fan says 0.15 amps, i cant read the other one but its most likely close to the same, that means you arnt even drawing one amp on the connection,

 

i have connected 4 fans like that and a CD drive on one of those plugs before


Edited by mikey11, 19 June 2017 - 07:34 AM.


#7 Platypus

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Posted 19 June 2017 - 07:45 AM

AMP/MOLEX connectors are rated for either 8.5A or 11A current capacity, depending on which specification you take. It looks to me like the blurry fan image may say 2.4W, if so that fan would require 0.2A

 

In that case, the two draw 0.35A


Edited by Platypus, 19 June 2017 - 07:46 AM.

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#8 MadmanRB

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Posted 20 June 2017 - 01:05 AM

You will be fine, your computer will not perform the 1812 overture or the lead role of explosions from a Michel Bay film.


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#9 MrSippi

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Posted 21 June 2017 - 10:13 PM

If your PSU have a single 12V rail divide the amperage to how many 12 molexes you have. You'll probably find that it's ample.


Edited by MrSippi, 21 June 2017 - 10:13 PM.

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#10 jonathanmrk

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Posted 22 June 2017 - 04:59 AM

One fan is 12v 0.15amp and the other is 12v 0.7amp. Is this set up safe? Can power unit handle a 0.7amp fan which makes an electric drill like noise?

Nothing else except these two fans is attached to the molex. Two SATA hard disks are run by the mobo.

#11 mikey11

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Posted 22 June 2017 - 06:45 AM

Can power unit handle a 0.7amp fan which makes an electric drill like noise?

 

 

you need a new fan if its making noise like that



#12 jonathanmrk

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Posted 22 June 2017 - 06:56 AM

Can power unit handle a 0.7amp fan which makes an electric drill like noise?

 
you need a new fan if its making noise like that
But it works fine and blows a typical tornado.

Edited by jonathanmrk, 22 June 2017 - 07:16 AM.


#13 Platypus

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Posted 22 June 2017 - 07:16 AM

One fan is 12v 0.15amp and the other is 12v 0.7amp. Is this set up safe? Can power unit handle a 0.7amp fan which makes an electric drill like noise?

Nothing else except these two fans is attached to the molex. Two SATA hard disks are run by the mobo.


So this is a different fan to one shown in your photo? 0.7A is still way below the 8.5A or more a Molex connector is rated for. Not sure why you'd want a terribly noisy fan in a computer though...

The power for SATA drives still comes from the PSU, but on separate connectors.

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#14 jonuk76

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Posted 22 June 2017 - 07:26 AM

Yes it's fine.  Years ago there was a trend for using ultra high speed Delta fans in computers.  I tried one once, couldn't bear it, took it off and sold it after a few days...  It was IIRC a 7000 rpm 60mm fan on a CPU cooler.  It sounded like an idling jet...

 

EDIT: This - http://www.sidewindercomputers.com/del60ffb06121.html

 

They also do high speed 120mm fans pulling 30 watts if you're interested...


Edited by jonuk76, 22 June 2017 - 07:29 AM.

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