UPS power must be higher than PSU rated power?

[user079622]

Is PSU marked power, output power?
If PSU has marked 1000W that mean it drain /input power is higher than 1000W so UPS must be higher than 1000W(PSU rated power)?
How much higher UPS power must be, assumption is that ups drive only computer and monitor(maybe only 20W)?

 

[Baluncore]

The PSU may be able to source 1000 watt, but the load may only be drawing a maximum of 500 watt.
The UPS would need to be rated something like 20% more than is needed, about 600 watt to support that 500 watt load on the PSU.

 

[berkeman]

Is PSU marked power, output power?

The datasheet should show both input requirements and output capability.

 

[user079622]

The PSU may be able to source 1000 watt, but the load may only be drawing a maximum of 500 watt.
The UPS would need to be rated something like 20% more than is needed, about 600 watt to support that 500 watt load on the PSU.

More than is needed or rated?
If psu has rated 1000w, ups must be 1200w?

 

[Baluncore]

More than is needed or rated?

More than is going to be needed.

 

[Rive]

If PSU has marked 1000W that mean it drain /input power is higher than 1000W so UPS must be higher than 1000W(PSU rated power)?

It's advisable to measure the peak consumption of the set before selecting an UPS.

For example I have a rig with a 600W PSU (recommended due the VGA card).
It eats up around 60W average/idle (with monitor).
The peak is around 150W.

In theory I could do with a 300W UPS (with ~ a dozen minutes of uptime, worst case) but since I wanted long battery time (even at the end of the battery lifetime) I bought a 900W one - that was the type with the biggest single battery I could fetch.

 

[user079622]

More than is going to be needed.

@berkeman

At psu write max total output is 1450W.
That mean it can drian 20% higer then that.

 

[berkeman]

At psu write max total output is 1450W.

And what voltage and current are listed at the power cord input to the UPS?

 

[user079622]

And what voltage and current are listed at the power cord input to the UPS?

I dont know.
Why do you need power input of UPS?

 

[berkeman]

I dont know.

Just look where the power cord goes into the UPS...

Why do you need power input of UPS?

I guess I don't at the start of this thread, you were asking whether the "power" of a UPS was its input or output power.

 

[user079622]

Just look where the power cord goes into the UPS...I guess I don't at the start of this thread, you were asking whether the "power" of a UPS was its input or output power.

I dont have UPS and I didnt ask that.
I ask for PSU power..

 

[berkeman]

Is PSU marked power, output power?
If PSU has marked 1000W that mean it drain /input power is higher than 1000W so UPS must be higher than 1000W(PSU rated power)?
How much higher UPS power must be, assumption is that ups drive only computer and monitor(maybe only 20W)?

Okay, I guess I misinterpreted your OP. Nevermind.