APC wrote ...
This note helps explain the differences between Watts and VA and explains how the terms are correctly and incorrectly used in specifying power protection equipment. Many people are confused about the distinction between the Watt and Volt-Amp (V-A) measures for UPS load sizing. Many manufacturers of UPS and load equipment add to this confusion by failing to distinguish between these measures.
get the PDF here:
http://www.apcmedia.com/salestools/SADE-5TNQYF_R0_EN.pdf
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