Question New PC Shutting Down on Power Outage Even Though New UPS is Working

EndlessJourney

Commendable
Jul 7, 2017
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1,510
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Hello,

My wife's new (2 months old) computer is shutting down when power is down even though it's plugged on its UPS.

Some specs:

PSU Grand RGB 1050W Fully Modular 80+Plus PLATINUM
RAM G.SKILLK 32GB (2X16GB) DDR4 3200MHZ
GIGABYTE MOTHERBOARD Z390 AORUS PRO, 1151, DDR4, ATX
INTEL CPU Core i7-9700K, BX80684I79700K
GIGABYTE VGA RTX 2060 SUPER GV-8GD

The UPS is: UPS Green Cell Power Proof 2000VA 1200W
https://greencell.global/en/other/1089-ups-green-cell-power-proof-2000va-1200w.html

Things I've tried and didn't work:
-I've tried turning the "dummy load" power option in the bios on and off and also on auto, and nothing changed (so it's not that bios option in the power menu)
-I swapped that UPS for an identical one, which I use on my PC, and it worked fine on me while my wife's PC still shut down (so it's not the UPS)
-I changed the power cable (didn't work)
-I tried cutting the power in the entire house (UPS worked, but computer shut down)
-I tried pulling the power plug that connects to the UPS from the power socket (the UPS started working, but the computer shut down)
-I tried turning off the power while running windows 10 idle and also while only on BIOS (both times UPS worked but the computer shut down)

What could it be?

Thank you in advance,
Theo
 
hi, when power cuts down, there is small delay before ups switches to battery (few miliseconds)
PSU itself has capacitors which can drain without power within few miliseconds, if they drain faster than battery kicks in, then pc will shut down
so a PSU replacement would be needed with better capacitors
 

EndlessJourney

Commendable
Jul 7, 2017
11
0
1,510
0
hi, when power cuts down, there is small delay before ups switches to battery (few miliseconds)
PSU itself has capacitors which can drain without power within few miliseconds, if they drain faster than battery kicks in, then pc will shut down
so a PSU replacement would be needed with better capacitors
But the PSU is new and rather powerful ( PSU Grand RGB 1050W Fully Modular 80+Plus PLATINUM ) can it be faulty? The computer has no other issue. Is there a diagnostic or something I can run?
 

EndlessJourney

Commendable
Jul 7, 2017
11
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1,510
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Specifically, my PSU specs (found here: https://www.thermaltake.com/toughpower-grand-rgb-1050w-platinum.html )state that it has:

Power Good Signal100-500 msec
Hold Up Time> 16msec at 100% of full load


While the UPS specs (found here: https://greencell.global/en/other/1089-ups-green-cell-power-proof-2000va-1200w.html#specification ) state:

Response time2-6 ms

So, the PSU (in theory) gives the UPS enough time (more than 16ms) to kick in. But in reality it just shuts down, sometimes immediately, and sometimes after a few seconds.
 

EndlessJourney

Commendable
Jul 7, 2017
11
0
1,510
0
well..diagnostic on this is done through osciloscope, but its a bit dangerous since u have to connect it to mains grid
OK I have no idea how to do that anyway. I'm contacting my PC supplier, though the PC runs perfectly fine.

UPDATE: I tested it with 2 identical UPSs (specs found here: https://greencell.global/en/other/1089-ups-green-cell-power-proof-2000va-1200w.html#specification ) as well as an older small UPS of 400W. (Only the PC on the UPS, which was directly connected to the grid).

Surprisingly, it seemed to shut down immediately with the new and large 1200W UPSs, but it held for a few seconds with the 400W before overloading it. Is that a hint for something?
 
Oct 14, 2020
1
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10
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Thermaltake Toughpower Grand RGB 1050W Platinum

* Same Problem *
Mine dies and have to turn its switch off then back on to power back up.
Any little power blip triggers it!
 

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