batty_professor

Hi,and welcome to TSF. Each of those items should have labeling indicating it's power requirements. The tower is likely 300 watts or so, more or less, depending on it's internal accessories. The monitor 80-110 watts, again an estimation. The printers? inkjet printers require very little power, though laserprinters require much more, as they have substantial heaters within. Small fans, I'll guess 35 watts each. The camera charger will also be labeled, probably 50 watts or less. The way it looks, if the printers are inkjets, and you only needed this to operate for short periods of time, you could run a couple of hours on a deep-cycle battery and a 1000W. inverter. The smallest portable generator you would find is probably 1500 watts. Which should be sufficient. The bottom line is you need to check the requirements on each item's label, and simply add them up for a total.