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Thread: Facing a strange issue with Corsair CX550

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    I don't think I can be of much more assistance, sorry.

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    I've never heard of anyone having issues with simulated sine wave and a CX PSU. But, then again, I have no idea how wonky the sine wave is on your UPS.

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    Well I just want to know that a new 600VA/360W APC UPS(supposedly better than my current generic UPS even if still simulated sine wave only) will work for sure with this CX550 which I still feel is doubtful. Or I can try my luck with a 1000VA APC UPS but that's a lot of money for me just to spend based on trying luck so hoping that I can get some reasonable basis for it.

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    It is not really a sine wave at all, just a rectangle such that the top voltage agrees with the sine wave and the resistive power also agrees.

    Or you can try it on a car battery and something might be learned with zero cost; sure beats asking people that don't have access to your equipment.
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    Last edited by ashiekh; 05-17-2018 at 03:02 PM.

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    I can assure you experimenting with car battery is not a feasible idea in the place I live.

    My main concern is that either CX550 is drawing much more power than actual system load during power cut/switchover or its holdup time is much shorter under moderate system load. If it is true then getting a new APC 600VA UPS will solve this issue is also doubtful. As I said earlier if I can get some source which states that "activePFC PSU draw its max rated power during switchover irrespective of actual system load" then everything would be clear but till now no such source.

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    If I recall correctly, you said the CX550 was fine till recently.

    How about you borrow a battery from the 1400VA unit?

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    UPS is usual consumer class with sealed batteries inside. The batteries with 1400VA inverter are external type so not possible to match them without some serious hardware modification. I am also not going to try it because I neither have the requisite knowledge nor it is feasible(1400VA inverter serves as main backup for 2 floors). Currently I am managing by using my old FSP psu & will wait a few days to get some definitive reason for this issue. If I don't get it then I will start saving money to buy a 1000VA APC UPS a few months later which is going to cost me more than CX550.

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    Why do you have a second UPS if there is a primary?

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    Why get a 1000VA UPS?

    Are you planning on plugging more than the PC into it if you do? Or are you just looking for longer backup time?

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    Quote Originally Posted by ashiekh View Post
    Why do you have a second UPS if there is a primary?
    It is not UPS,it is a big capacity inverter with multiple external batteries to act as main backup source for 2 floors. UPS is exclusive to my desktop.

    Quote Originally Posted by jonnyGURU View Post
    Why get a 1000VA UPS?

    Are you planning on plugging more than the PC into it if you do? Or are you just looking for longer backup time?
    Because I think an activePFC psu like CX550 draws its max rated power load of 550W when under moderate system load(~250W I guess) & a power cut happens. I think so because my UPS is successfully able to handle such situations with FSP 400W psu confirming that my actual system load is well within UPS capacity to manage during switchover & powercut. Another possible reason might be shorter holdup time of CX550 but just like you said, that is also dependent on amount of power drawn by psu & it will be much shorter if psu is drawing 550W opposed to,say,250W when power cut happens. That is why I am hoping to get some sort of confirmation for this as it will help others too who tend to buy psu of capacity more than what is required just to get some extra breathing space for possible future upgrades.

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