Intresting but very misleading assumtions, you need to do more reseach in batterys for one, and inverters i run a solar inverter and 1 200ah c20 battery i run a 1000w desktop, fan, router, printer the pc is not pulling 1000watts as i just watch a movie i easly get more that 8hour and this is all auto with the ups function of the inverter some times i do not know we have a power cut, ups function i belive are not on gensets so small power cuts are a pain for gensets also have to take into account noise, fumes, on going cost fuel the whole point is what is the best ups for a pc and in my opion it is a c20 battery and inverter with ups funtion NOT A GENSET