^ Oh ok. The PC consumes 366W.
It entirely depends on how you use your pc after primary power cut.
Generally a PC with ideal usage such as web browsing, office work, won't consume more than 50-75w, however while doing intensive gaming your PC might draw a lot of power, reaching upto 250-350w. If it's a mainstream Gpu, that alone can take upto 150w or more, then add 40w from cpu, and 50-150w from other components and peripherals.
Now from what I know a mainstream ceiling fan consumes anywhere between 50-90w/hr. Considering this if your inverter can run 2-3 fans for 5-6hrs easily, then It should be able to power your gaming activity for 2-3hrs easily.
Depends on how powerful your inverter is.
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