couple years ago i used my local electrician to get me an APS (600w if i remember correctly) and a battery (1 x 150amp) he connected it to the lights tv and my pc, under load the battery lasts less than an hour, if it's light load like lights + pc with chrome only it lasts 4-5 hours, an important thing to note is that my pc under full load does not remotely reach 600 watts but if i turn everything off in the house and only use the pc and open an intensive game such as gta the ups can't handle it it will beep and turn off and require a manual turning on. I suspect the brands of APS here cannot handle their rated wattage on electricity loss so I think you should always go for a higher wattage than you need so you ensure keeping constant flow of electricity regardless of power loss. It is very frustrating having bought this APS (for at the time to keep my pc on during the 5 mins it takes for generator to come on) and have it only work if i have chrome open and nothing else.
with my current setup:
lights + wifi lasts over 6hrs (highest amount of electric cuts was 6hrs so far)
lights + wifi + light pc usage aka chrome lasts max 6hrs
lights + wifi + League of legends with gpu capped at 40% power usage max 4hrs
lights + wifi + any intensive game even with 40% gpu power usage gives instant off
just pc with intensive game and 40% gpu power usage gives instant off
I don't remember how much did the inverter cost but the battery was $150
with my current setup:
lights + wifi lasts over 6hrs (highest amount of electric cuts was 6hrs so far)
lights + wifi + light pc usage aka chrome lasts max 6hrs
lights + wifi + League of legends with gpu capped at 40% power usage max 4hrs
lights + wifi + any intensive game even with 40% gpu power usage gives instant off
just pc with intensive game and 40% gpu power usage gives instant off
I don't remember how much did the inverter cost but the battery was $150