A computer power supply does not pose a seriously complex load ('complex load' in its electrical meaning); in other words, a computer power supply wattage (e.g. 550W) will be approximately the same as is VA value.
However, a computer's power supply is typically rated after its nominal output power. Since it can't operate at 100% efficiency, the input power will be higher than 550W under maximum load.The power supply's technical data should tell you its rate of efficiency or its input power under maximum load, and you can chose the UPS accordingly.
You could also chose a less scientific approach and justify the purchase of the 800VA, the 600VA, or even 400VA UPS: The bigger UPS will be overrated for this particular power supply, but might provided the better investment as it can support additional (small) devices and is likely to be sufficient in the event of a computer replacement (which might have different power requirements).
However, the 600VA unit will probably be just fine for this particular case.
You could also argue that the 550W power supply is a nominal power rating; it is the power the power supply is specified to sustain under full load. Your computer will very rarely come anywhere near this, and you could argue that high power number-crunching or DVD writing may not be required during a general power outage, making a less expensive apparently underrated UPS sufficient to sustain operations or data for the expected duration of a general outage.
Yes, an 800va UPS might power a PC with that size power supply and a monitor. Of course, to be on the safe side, you should use a modern monitor and not a CRT monitor.
VA stands for Volt-ampere. 1 VA is equal to 1 Watt. So 600va is about 600 watts. This can be confusing because a power supply rated at 600va will not put out 600 watts due to reactance. The power supply contains an inductor or capacitor so the actual output will be around 1/2 to 2/3 of the VA.
This is pushing it, but it might be possible. If the PC has a 550 Watt power supply, then if you monitor pulls 250 Watts or less, it should work. You would likely do better if you had a LED/LCD monitor with this PC and backup power supply. Of course, the 550 Watt power supply shouldn't be pulling that all the time.
any power supply with at least 175 watts
No attempt should be made to repair the power supply. The power supply should be replaced with a power supply of equal or greater wattage.
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infact i think the power supply be replaced with new one. infact i think the power supply be replaced with new one.
The type of power supply being used (AC or DC) should match the power requirements of the device it will be supplying power to.
Remove and replace the power supply.
no you should not. You connect it to the PS1 power connection
For a god quality PC power supply; 120mV on the 12V rail 50mV on the 5V and 3.3V rails
Voltage settings on the back of the power supply should be checked