The do not say it because Watts = Volts x Amps ONLY in DC or 100%
resistive AC loads. If it is an inductive load, it isn't that simple, that is
why they have `VA', `Volts x Amps', ratings. There can be a phase difference
between the voltage and current, thus the `Wattage' is less than the `VA'
rating. A `1500VA' UPS is going to list less than `1500 Watts'. Just check
out any UPS manufacturerer's specs. and the `VA' and wattage ratings will be
different. To be safe, I take the voltage rating of the equipment and
multiply it by the current rating to come up with the `VA' rating. I know APC
says to not go over 80% of the UPS rated load, so take your `VA' value and
divide by 0.80 to get the `VA' rating you want your UPS to be. This will
probably give you an UPS a little bigger than you need, but it is better to be
a bit too large than too small.
--
Brent L. Bates (UNIX Sys. Admin.)
M.S. 912 Phone:(757) 865-1400, x204
NASA Langley Research Center FAX:(757) 865-8177
Hampton, Virginia 23681-0001
Email: B.L.BATES@xxxxxxxxxxxxx http://www.vigyan.com/~blbates/
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