UPSes come in all sizes, up to ones large enough
to power the entire city of Fairbanks, Alaska. However, as just brew it!
stated, consumer UPSes usually skimp on the duration of backup capacity. I'm using this one
. It has plenty of power for my gaming PC and monitors, but don't expect more than five to seven minutes of gaming at 650+ watts. For just browsing the web, it'll last more than forty minutes. The manufacturer rates the capacity at two minutes at full load (900 watts) and eleven minutes at half-load (450 watts).
With a USB cable connected to the UPS, Windows will automatically put your desktop PC into battery saving mode at low battery and into hibernation when the UPS battery runs down to the critical level - it behaves just like a laptop in that regard.
1: i7-9700K, NH-D15, Z390M Pro4, 32GiB, RX Vega64, ½TB 960Pro +2TB MX500, Define Mini-C, SSR-850PX, LG 32UD99 + UltraSharp U2410, RK9000V2-BR
2: R5-3600X, Wraith Spire, B450M Steel Legend, 32GiB, RX5500XT, 2TB SX8200Pro, P160, SS-660XP2, TV, G610