The exact requirements will depend a bit on your specific PC's and their uses....but this is what I would guess...
3x PC @ 200W = 600W (depending on usage/configuration this could range anywhere from 150W - 500W)
1x inkjet printer @ 50W
2x notebooks @ 90W = 180W
3x monitors @ 50W = 150W (for LCD's, about 150W/CRT)
So that totals 980W. Build in some extra, and I would guess you need about 1.5 - 2kW to be safe and happy. 1kW will be a bit on the edge (make sure the wattage is enough, as they often advertise the kVA's).
What I do is run everything off a UPS, and then if the power goes off, unplug the UPS and then plug the ups into the generator (that way you also won't have any surprises when the power comes back on). When it comes back on just move it back to the mains.
Watch out for generators, they can have very unstable outputs (depends on the model/price), which is one of the reasons I prefer to run through a UPS, which will make sure the power the PC's see is stable.
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