Actually the NEC says that the load on a branch circuit can only be 80% of the breaker size since Some appliances use a more energy to start up. so to be legal, you could only have a 1440W load on a 15 amp circuit, and 2880W with a 240 v 15 amp breaker.
Another Answer You really should be asking how you can estimate ENERGY (not 'power') consumption, based upon a wattage rating. The term, 'wattage', is a slang term for 'power', which is expressed in watts. Power is simply a rate, the rate at which energy is being consumed, and energy (for the purpose of billing, at least) is expressed in kilowatt hours.
So if you know the power ('wattage') of your load, then you must ensure that it is expressed in kilowatts and, then, multiply it by the number of hours that the load is operating. This will then tell you how much energy has been consumed over that period, expressed in kilowatt hours.
The limit does not depend on the actual number of PC's that can be connected to a UPS. The limit is based on the total power consumption required by the PCs and the power supply rating of the UPS device. You can add the power consumption of all the PCs based on the number of watts (or amps) listed on a label on the back or side of each PC and compare it to the maximum load specified for the UPS unit.
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