Hi Paul,

I'm not skilled about IT and I thought my PSU max power consumption was enough to establish UPS max power supplying for my PC, anyway that's my hw cfg (but PSU of course):
- CPU amd ryzen 2200g = cTDP 46-65W
- mobo msi b450-a pro = honestly I don't know!
- ram HyperX Predator DDR4 HX432C16PB3K2/8 Kit 8 GB (2 x 4 GB), 3200 MHz, DDR4 CL16 DIMM = I don't know exactly but I guess about 2x1.5W = about 3W
- hdd WD black @7400rpm (WD1003FZEX-00K3CA0) = 6.8W (read/write)
- monitor Acer x193w = 37W
- other stuff: basic mouse + basic keyboard + case (Sharkoon S25-w with 2 fans) = I guess just a couple of Ws
TOTAL = 111.8W for sure + mobo + other stuff = I guess it's all under 200W

Now the bad news: here in Europe I can't buy neither APC BR1000MS nor CyberPower CP1350PFCLCD series nor GX1325U series. I'm especially sorry for APC which I know is an UPS market leader. Here I can buy these cyberpower UPSs
https://www.cyberpower.com/eu/en/pro...inewave#models
in particular I pointed my attention to cp900epfclcd 900VA pure sine wave model:
https://www.cyberpower.com/eu/en/pro...u/cp900epfclcd
which is my "milestone" both for specs and price. I can buy it for 170eur so let's put my budget to 206USD just to give an international gauge

There's also this Powerwalker, which is a very cheap alternative UPS with pure sine wave I can get here for just 85eur:
https://powerwalker.com/?page=select&cat=VI_SW&lang=en
and the closest to the above cyperpower is
https://powerwalker.com/?page=produc...120080&lang=en
800 VA - 480W (Output Power Factor 0.60) - Line-Interactive - Active PFC - Pure Sine Wave
I'm a bit skeptical about the "pure" sine wave declared due to its low cost, I can just point your attention to these amazon buyers' reviews:
- https://www.amazon.de/-/en/gp/custom...SIN=B00K792UR0
- https://www.amazon.it/gp/customer-re...SIN=B00K792UR0
but we have to trust! If those graphs are genuine then I guess its components are very cheap (and weak?); that's my only explanation for a so low priced pure sine wave UPS. Anyway what do you think of this "kind" of sine wave shape? Will it fry my active PFC UPS when on battery mode?

I'm just afraid the powerwalker won't last very much, I don't mean its battery but its electronics. By the way, are they comparable (lasting/cost) by a long time period "investment calculus"? In other words will the cyberpower last the double (or more) than the powerwalker? Finally consider I've got a welder and I can make very "easy" fixes like changing capacitors so I'll take a "little" electronic cure by myself of my 200$ investment