UPS didn't keep my computer on during power flicker

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lmgs37

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May 20, 2015
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I bought two of these: https://www.amazon.com/gp/product/B00095W91O/

I have my computer, monitor, router, and modem plugged into one with my TV plugged into the other. During a power flicker (which happens quite frequently in my area when thunderstorms roll through), the monitor, modem, router, and TV all stayed on but my PC was knocked out.

https://pcpartpicker.com/list/M72ZYr is my hardware and PCPartPicker rates it at under 300W. I was playing Overwatch at the time, could that be the issue?
 
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A 300W PC load at 70% efficiency draws 300/.70 = 428W from a UPS. Add in the monitor (25w ?) router (10w ?) modem (10W?) and you get a load that is higher than the 390W rating of your Backup. But this is likely not your problem...
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Truls Bjerkmo

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Jun 10, 2017
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Your UPS is line interactive. If it the time it takes for the UPS to function is longer then the time your PSU can be out of power, you will experience flickering, during power outage.
 
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lmgs37

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May 20, 2015
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Thank you for your answers by the way!

An online UPS is a bit expensive for my current situation so how I do know if I'm looking at a faster line interactive UPS than the one i currently have?
 
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lmgs37

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May 20, 2015
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Right, where are the numbers for that specific stat? For example, the UPS I have says it has AVR (Automatic Voltage Regulation) which would imply instant action.
 
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tsnor

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Nov 20, 2008
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A 300W PC load at 70% efficiency draws 300/.70 = 428W from a UPS. Add in the monitor (25w ?) router (10w ?) modem (10W?) and you get a load that is higher than the 390W rating of your Backup. But this is likely not your problem. Move monitor (35w ?) router (10w ?) modem (10W?) from the UPS shared with the computer over to the UPS shared with the TV. This won't fix the problem, but it will better balance your UPS load.

FIXES:
1. Buy a UPS that switches over quickly enough that your PC stays up. Like this one: https://www.amazon.com/APC-Back-UPS-Battery-Protector-BR1000G/dp/B0038ZTZ3W I have a couple of those, they work well. Use if for your PC, use the other UPS for the monitor (35w ?) router (10w ?) modem (10W?).
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2. Buy a new PC power supply with a longer "hold up" time. This is the time where the PSU can supply voltage after line current fails. The hold up time for the PSU has to be longer than the switch over time of the UPS or the PC crashes. The hold up time chart here: http://www.tomshardware.co.uk/seasonic-g-series-450w-power-supply,review-33328-4.html (see the chart labeled hold up time) shows that some PSUs have very short hold up times and some have very long. Your PSU is not holding up long enough.
 
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