PSU (ST50F-ES) & UPS problem

[rinrin]

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Hello.

I recently decided to change my PSU from a generic 500W to a branded Silverstone ST50F-ES one. The strange thing is when I wanted to test my UPS w/ the system, the UPS wouldn't hold when I cut off the power. I switched back to the generic PSU, and my UPS would hold. Switch back to the ST50F-ES, and my PC shuts off when the power is cut. I tested the +12V line and found out that when using the ST50F-ES and on battery mode, it would drop to about only 9V when the +12V ATX (CPU) is connected (HDD and DVD-rom disconnected). With the generic, it's still 12V. Is this normal? Should I change my UPS to a higher capacity? Change the battery? Recommendations are greatly appreciated.

UPS: APC CS 500VA (300W)
Proc: Intel Core 2 Duo E6550 2.33Ghz w/ stock HSF
Mobo: Asus P5GC-MX
VC: Nvidia GeForce 8500GT
RAM: 2x1GB

And Generic PSU 500W (for the heck of it):
AC-Input: 115/230V 8A/4A 60/50Hz (there is a switch to change the input voltage)
DC-Output: +3.3V(28A),+5V(38A),+12V(17A),-12V(0.8A),+5VSB(2A)
XX+5VN+3.3V Total Output 500W XX+5VSB=2.0AXX

Note: I have yet to test the system on a different UPS since I don't exactly have a spare...

[werty]

Active PFC na psu pilian na ug UPS brad. if it ain using pure sine-wave mag problema jd na inig switch to battery mode.

unsa man diay na brand ni imo UPS sir

[rinrin]

APC CS 500VA (300W), link is up there.

But yes, this model does not output a sinewave in battery mode. So the culprit is the active PFC then?

[werty]

hmm come to think of it, old unit na ba ni imo UPS? coz the problem lang about this kai inig kick-in sa battery lahi man imo symptom...

anyways if its an old UPS try lang replacing the battery, or better yet find another ups to try with

[rinrin]

Actually the PC doesn't automatically shuts down when I cut off the power. For a few seconds, it has the symptoms of low voltage. The LED from the fans dim and, and the fans seem to slow down. But after a while, video disappears, and the system practically freezes until I reset it, but the fans still run. If I cut off the power for only 2-3 seconds and switch it back on, the system still freezes.

You're right about it though, the UPS already has a few years on it. Good time as any other to change the battery. I'll see if I can borrow a spare UPS tomorrow and test it first before buying a new battery.

[siopao1984]

sakto si werty bai

probably get a 650VA ups ako lang suggest

[rinrin]

I have always wanted to upgrade my UPS, but the budget is a bit tight.

Also, considering that I do have enough time to shut down my PC w/ the generic PSU in battery, does that mean the ST50F-ES consumes a bit more power? Or is it as Werty has said, the PSU is just picky? Getting a UPS that gives out a pure sine wave is gonna break my wallet.

Hopefully, I can test this out tomorrow.

[technowar]

Dli na kadaug imong 500va bai. Igo nalang na siya mahimung avr.

[mcjiem]

dli jud na kadaog imo ups bai ky 300w rmn d i nah nya imo psu ky 500w branded pa jud

[dmelsie]

same problem ni kay jojo guro, 1500 VA to iya gamit na pero 1000 watts sad iya PSU hehehe

either sine wave output issue or need a beefier UPS gyud