Inverter & Battery advice

[REAPER]

Hi Guys

I need you'll to recommend what inverter and how many Ah battery I need to power my computer during load shedding.

This is my computer - https://support.hp.com/ca-en/document/c03832938

It should be 320w power supply and I have 2 monitors which is 20w each.

I only need to power it for 2 hours. I don't want something very expensive, otherwise I rather add a little more money and buy a laptop. Basically I want the cheapest option that will work.
I don't know anything about what to look for so any advice will be appreciated.

Thanks

 

[Adeptus Mechanicus]

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[Lupus]

Just had my Ryzen 5 2600, Rtx2060 Super on for about an hour didn't make the 1440w sweat. I've got 2 105Ah batteries currently it's just powering my one router and speakers.