It's the PSU size and TV consumption wattage.I checked CP1500PFCLCD it is too pricey. I found it on amazon.in for 50k INR which is 657$.750W pc?
Measured at the wall or is this the size of the PSU?
Well if you calculated that your max power consumption was 750w then you probably can use: https://www.cyberpowersystems.com/product/ups/pfc-sinewave/or1500pfclcd/
if you measured it at the wall then this one will give you almost 5 mintues: