Please recommend the size of UPS for my new PC build

[akshayt]

A 1000va is borderline, go for 1.5kva

and psu at least 1000w from corsair hx/ax or seasonic x or coolermaster silent pro gold

 

[nginx]

whats the use of the software?
I was looking at the 1KVA and 1.1KVA UPS by APC too. Didnt understand what the software does

That software enables you to shutdown PC automatically when battery gets low. Its a great feature to have if you like me, often leave your PC unattended at home.