Question New power supply makes UPS click (overloaded?) on startup

[GreenPan]

I just got an ASRock PG-1300G for my 5090. I ran it at full load with Furmark for 10 minutes and played Helldivers 2, everything seemed fine. But I notice that when I press the power button to turn the PC on (when it's totally off), my UPS clicks and the display lights up almost like it was momentarily overloaded. Is that odd? My previous power supply didn't do that and I'm not sure what to make of it. The UPS has a max load of 900W

 

[Lutfij]

My previous power supply didn't do that and I'm not sure what to make of it. The UPS has a max load of 900W
Make and model of your UPS and it's age? Make and model of your PSUY prior to the ASRock PG-1300G?

Moved thread from Components section to Power Supplies section.

 

[Misgar]

when I press the power button to turn the PC on (when it's totally off), my UPS clicks and the display lights up almost like it was momentarily overloaded. Is that odd?

Not really. Quite a few ATX PSUs momentarily draw up to 100A from the AC mains at initial switch on, especially from a nominal 230V 50Hz supply. Even from a nominal 115V 60Hz mains supply, the switch-on surge can be tens of Amps.

With a large PSU like the PG-1300G rated at 1300W, it's possible the switch on surge is too much for your old 900W UPS.

By the way, what is the VA rating of your UPS? I'd expect it to be roughly 1500VA if it has a 900W output, as per this APC unit:

https://www.se.com/uk/en/product/SM...usb-and-serial-communication-avr-graphic-lcd/

 

[GreenPan]

Not really. Quite a few ATX PSUs momentarily draw up to 100A from the AC mains at initial switch on, especially from a nominal 230V 50Hz supply. Even from a nominal 115V 60Hz mains supply, the switch-on surge can be tens of Amps.

With a large PSU like the PG-1300G rated at 1300W, it's possible the switch on surge is too much for your old 900W UPS.

By the way, what is the VA rating of your UPS? I'd expect it to be roughly 1500VA if it has a 900W output, as per this APC unit:

https://www.se.com/uk/en/product/SM...usb-and-serial-communication-avr-graphic-lcd/

It's this model: https://www.apc.com/us/en/product/B...bcategory-id=88975&selectedNodeId=27590292604

Interestingly, it hasn't been doing it now. Everything starts up normally. But from what I can tell 900W is as high as you can go with UPSs unless you want to spend huge amounts on units with loud fans that run constantly

 

[GreenPan]

Not really. Quite a few ATX PSUs momentarily draw up to 100A from the AC mains at initial switch on, especially from a nominal 230V 50Hz supply. Even from a nominal 115V 60Hz mains supply, the switch-on surge can be tens of Amps.

With a large PSU like the PG-1300G rated at 1300W, it's possible the switch on surge is too much for your old 900W UPS.

By the way, what is the VA rating of your UPS? I'd expect it to be roughly 1500VA if it has a 900W output, as per this APC unit:

https://www.se.com/uk/en/product/SM...usb-and-serial-communication-avr-graphic-lcd/

Nevermind it just did it again lol

It seems to happen randomly but there must be some trend. It makes the UPS switch from outlet power to battery power just for a moment. I'll also note that the lights sort of flicker


I live in a brand new house so the electrical system should be fine to handle this much