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Connecting two PSUs in series?

post #1 of 10
Thread Starter 
Thinking of getting a second AX1200 to add to my rig for redundancy purposes.

How does this work?
post #2 of 10
You would be running in parallel. There is a jumper for the second "slave" PSU.

Hell of a lot of power. Watch your current draw. But using a second redundant unit should not trip a 120 VAC 15 A breaker.

Now, for this system to be redundant, you would need to create a power plane, on for 12 VDC, one for 5 VDC, one for 3.3 VDC. This would require a good bit of soldering. I see no problems once you get the two units powered, parallel should not affect them. But the transient startup is my concern.
Edited by Sun - 4/25/12 at 2:12pm
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post #3 of 10
"Connecting two PSU's in series" == BOOM!

I don't think there is a PS designed for redundant power for desktops.

Your best bet is to use 2 and split the load if your concerned about failure.

EDIT: guess there is. But they are proprietary. Doesn't seem feasible for a desktop system. You could design a monitoring circuit and use a battery backup for the interim while switching but once again why on a desktop?
Edited by Hueristic - 4/25/12 at 7:05pm
post #4 of 10
I'd strongly recommend you have a dedicated circuit ran to the room you wish to run this set up. Ideally it would be a dual 20a circuit. Split the recepticle so the top is on one dedicated 20a and the bottom is on another.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by Sun View Post

You would be running in parallel. There is a jumper for the second "slave" PSU.
Hell of a lot of power. Watch your current draw. But using a second redundant unit should not trip a 120 VAC 15 A breaker.

I thought that PSUs only used the power that they needed and didn't draw their rated?

Would running the second in slave as the previous poster suggested work?
post #6 of 10
Thread Starter 
I didn't expect it to be this complicated. I just thought it would be nice to have a redundant PSU. If this shouldn't be done - then I won't do it. I already have a UPS plugged in for safety purposes but I was just going to do this to be safe for other purposes.

Is there any easy way to do this without modifying my current electrical setup?
post #7 of 10
a 15a circuit is only rated for a little over 1400 (1440 iirc) watts. If you are talking about getting draw from both PSU in excess of that then, no.

If you are talking about having a second 1200w PSU to kick in if the current one fails you would be fine. I dont know how you would accomlish that but from an electrical perspective you will be ok if both were not pulling in excess of the previously mentioned 1400w
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post #8 of 10
Quote:
Originally Posted by xyeLz View Post

I thought that PSUs only used the power that they needed and didn't draw their rated?
Would running the second in slave as the previous poster suggested work?

Here is a link to a simple dual psu connector LINK There are a few items like this out there, but again, if you are pulling more than the 1400 watts on that circuit its a fire hazard. The breakers are meant to trip to prevent this, but I have seen plenty of breakers not trip when overloaded. Be safe.
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post #9 of 10
Thread Starter 
I see. Will it be unsafe to use that PSU cable to connect them? Will it draw too much power or will the new one only kick in when needed? How much power will it draw?

Thx for the help.



Sent from my Windows Phone: Nokia Lumia 900
post #10 of 10
the cable that was linked to is designed for people who need more than 1200W so they use two PSU's for a total of 2400W not redundant.
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