This UPS enough for PC?

[Brawler]

Hello.
I have a spare UPS (RCT 850VA)

Will it be enough for this pc incl monitor? The PC is quite loaded.
i7 8700
4x 8GB DDR4
AIO water cooler
2x ssd, 2x 5400rpm hdd
2070 super
Dell d2719hgf 1440p 155Hz (also on UPS)
Gold rated 650W PSU

PSU calculator says I am using about 515W under load. The monitor is 45W apparently.
.
I'm not planning on gaming or anything while on battery (obviously). Just need it for 2 minutes or so if the power cuts unexpectedly.
Got the UPS connected at the moment(connected to wall and power on) and this is what the status monitor says when the PC has some load.

 

[PsYTraNc3]

The load on the UPS might be an issue.
I have RCT 1000VA and it cuts off immediately if the load is too high.
Running fine with 2x 20", 1x 24", i7 desktop with low load and a laptop charger but couldn't handle much more than that.

Google says the max on the 850VA is 480W

 

[Brawler]

The load on the UPS might be an issue.
I have RCT 1000VA and it cuts off immediately if the load is too high.
Running fine with 2x 20", 1x 24", i7 desktop with low load and a laptop charger but couldn't handle much more than that.

Google says the max on the 850VA is 480W

Thanks!
Do you know if the load will be a problem if the UPS is getting power from the mains?
99% of the time the PC will be shut off before load shedding and for the 1%, the computer will probably be idle.
I could sware the PC feels a bit sluggish since I connected it to the UPS...