UPS wattage output

[DocYahoo]

I just purchased the PK Electronics' Blackout Buster. In the spec. it says the output is only 250W, but the computer hooked up to it is 300w. With the 300W PS and a monitor hooked up to the 250w output UPS, will my computer get insufficient power and effect its stability?

Thanks.

 

[DocYahoo]

^

 

[corkyg]

All |I can see as immediate impact is that you will have a very short backup time . . . so as soon as you get an alarm, power down gracefully right away. You can make it longer by not connecting your monitor. It is possible to execute a proper Windows shutdown with no Monitor . . . just hit Ctrl-Esc, then after a couplke of seconds, hit "u" and it will shutdown.

Your 300 P/S does not mean you are running 300 watts . . . that is a peak load capability that must cover all attached peripherals. The biggest power hog in any system is the monitor.

I have a 650 V-A (volt-amp, not watts) UPS, and I figure about 15 minutes with monitor and double that without.

Unless there is a power outtage, your system components connected to the UPS simply pass through. Just curious . . . why did you get such a small UPS?

 

[DocYahoo]

corky-g:

The UPS I got is 500 VA, but on the spec, it says the output is only 250W.

And according to you, 'if' my PS needed 300W, my UPS will NOT be able to deliver it?

The UPS I have is the PK Electronics Blackout Buster.

The spec. for the UPS is here.

 

[DocYahoo]

^ help

 

[sharkeeper]

Most UPS' are rated on VoltAmperes or VA. The load power as expressed in VA. This value is usually greater than real power or watts, due to circuit reactance or reluctance. This reactance or reluctance causes the timing between the voltage and current to vary. Device sizing must be in accordance with Volts times Amps (VA) rather than in Watts, since Volt-amperes is the apparent load seen by the power-handling device.

A 500 VA UPS is fine for a single computer and a monitor (even a 21&quot. It will not give you much more than 5 minutes of backup time with healthy batteries, but nevertheless it is sufficent to shut down if you have a blackout. Your 300W PS will never be drawing close to 300W. Power supplies in computers due to their switching design must have ample reserve to allow for sudden increases in current so critical voltages don't sag causing problems.

Cheers!

 

[Conroy9]

heh
don't forget to hit "S" and "enter" after you do the ctrl-esc "U" bit, if you're going to be shutting down without a monitor...

 

[corkyg]

Not necessary . . . Ctrl Esc, U and Enter. It defaults to Shutdown.

 

[TravisBickle]

begging you chaps' pardon, but I think it's silly to try to save your work without a monitor on. if you want a ups it suggests you are professional and serious about your data. so why do things in such a half=assed way? because that's what it sounds like, cheapo!