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12V Power going into a power supply through molex bad?

post #1 of 5
Thread Starter 
Crazy question, I am building an epic test bench setup, anyway part of that has me concerned.

I want to have my pump hooked up to a molex splitter with 2 females ends. One female will go the power supply and the other will be mounted to the bench for using either another power supply or a 12v AC to Molex PSU. I am curious if I was to do this and hook up the power to the Molex with the external power supply would the voltage going to the PSU hurt it? So I put it on a 3 position switch, or will the Power Supply not be phased.

It is a high end Power supply, My EVGA G2 1600w will be going into the bench (going to replace it with a platinum for my main rig). (I may actually buy a AX1500i for the bench haven decided yet)

And before someone says why not just change the plug, This bench will be all hardline tubes ECT, it will be very very difficult to do things like that, I may even make passthroughs top side so that if I need x GPU ports I can use just those, if that makes since.
Edited by Cyber Locc - 2/2/16 at 4:47pm
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post #2 of 5
It technically 'wouldn't hurt anything', but you would be essentially combining the power rails in parallel. I have done something similar by cobbling together a pair of junky old PSU's, but I would just add a SPDT switch to it to switch between power sources. You could leave the ground wires all connected and just switch the 12V power. You could mount this switch just about anywhere.
post #3 of 5
Thread Starter 
Quote:
Originally Posted by Kleer Kut View Post

It technically 'wouldn't hurt anything', but you would be essentially combining the power rails in parallel. I have done something similar by cobbling together a pair of junky old PSU's, but I would just add a SPDT switch to it to switch between power sources. You could leave the ground wires all connected and just switch the 12V power. You could mount this switch just about anywhere.

Okay I will check into that if I can find one I have no problem with that but I would need it to be round.

"but you would be essentially combining the power rails in parallel." well ya but see both will never be used at the same time. If i am using the phyoba 12v molex power supply the main power supply will be off. It is only for leak testing the loop, that way the Power supply doesn't have to be on for the pump to be on.

That was my concern since the actual power supply will be off if this is plugged in, the power might back feed into a power supply that is shut off?
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post #4 of 5
Platinum is not worth upgrading to from a gold rated unit.
Skip it and move to Titanium if you are going to upgrade.
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by shilka View Post

Platinum is not worth upgrading to from a gold rated unit.
Skip it and move to Titanium if you are going to upgrade.

I wasn't upgrading for the efficiency I am upgrading for the fan. The fan is my g2 is kinda loud, and the platinum one has that spin on demand mine does not. I dont mind the fan being loud when being stressed gaming ECT, but with my g2 the fan is always loud. Not as loud as the 1300w I use to have lol but still louder than anything in my case.

I will look at the titanium when I upgrade though.

So you seem pretty knowledgeable about PSUs, so what do you think about my idea will it hurt my PSU?
Edited by Cyber Locc - 2/3/16 at 11:02am
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