PSU and UPS Compatibility Issues

jpmeneses21

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Aug 10, 2013
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I have a still-brand new Intex 650VA UPS (bought last February). A power outage occured last night and it got overloaded and was not able to provide emergency power for me to shutdown my PC properly.

My system specs are:
i5-4570 Haswell, GTX 760, 1x SSD, 9 LED case fans, powered by a Corsair GS700.

My UPS's specs are:
Input voltage: 140-350VAC
Frequency: 47-53hz
Voltage on Mains: 200-250VAC
Voltage on Battery: 220VAC 8% 50.2Hz
Battery: 12V 7.2Ah *1

When power resumed, I tried testing it again. Since my UPS is still fully charged, I restarted my PC and pulled the plug (risking damage to my system, all for the sake of checking it), and the emergency power still did not take effect, thus overloading the UPS and shut down immediately.

But when I removed the CPU connection, and left the monitor plugged to the UPS, the UPS worked normally (beeped every 2 to 3 seconds as opposed to a straight continuous beep of an overloaded UPS), and provided power to my monitor.

Learning this, the only conclusion I have is as of the moment is maybe because my 700W power supply is drawing too much power from my 650VA UPS. I've read somewhere that a 650VA UPS is ideal for 360 to 400W of power consumption. Is this true? From what I understand, My UPS should work, because I'm not running at maximum load most of the time. My rough estimate is I don't go over 200W when idle, and not more than 400W when in full load.

Also, I've read before that a calculation of "1.6 x PSU Wattage = Recommended VA" should be considered. If this is also true, that means the recommended UPS for my system is at least at 1120VA, because 1.6 x 700W = 1120W.
 
Solution
Yeah that means your UPS is not performing as advertised.Your ups has a 650VA Battery which means power of little more than 360W.At 360W load ups battery can provide backup of about 2 min when fully charged on my APC ups which is rated 600VA.

It really depends on your usage.
If you want to use UPS just as voltage regulator and for protecting your data loss i.e.you will try to shut down your pc as soon as possible during power outage then 800VA UPS will be sufficient.

If in your area power outages are common and you will be using UPS power to run your PC for SIGNIFICANT time then 1000VA or 1500VA ups will be enough
I think problem is with your UPS.Its rated Power Output is not the exact power being delivered by its battery.
At 360W load your UPS must provide atleast 2min on its battery when fully charged.
Also at idle state pc doesnt draws much power.So atleast at idle state UPS should be able to power your pc
There can be only this conclusion that your UPS is not of good quality.
You should have gone with something like APC
 

jpmeneses21

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Aug 10, 2013
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Yes, that's what I'm expecting as well, at least a minute or two of emergency power. I don't get what you mean by "rated power output is not the exact power delivered by its battery," does it mean that my UPS is not performing as advertised?

A 1500 APC UPS is too expensive, but yes, I agree that it's one of the best out there. I'm thinking of getting another one but at 1000VA. Will that be enough?
 
Yeah that means your UPS is not performing as advertised.Your ups has a 650VA Battery which means power of little more than 360W.At 360W load ups battery can provide backup of about 2 min when fully charged on my APC ups which is rated 600VA.

It really depends on your usage.
If you want to use UPS just as voltage regulator and for protecting your data loss i.e.you will try to shut down your pc as soon as possible during power outage then 800VA UPS will be sufficient.

If in your area power outages are common and you will be using UPS power to run your PC for SIGNIFICANT time then 1000VA or 1500VA ups will be enough
 
Solution