Poor power factor on a PC comes from current distortion not lag or lead. That's why it can only be corrected by bulky filter networks or complex active correction. One side effect is that it is quite possible to have an online UPS with a higher output current than input current. ----- Original Message ----- From: "Peter L. Peres" To: Sent: 29 March 2003 08:58 Subject: Re: [EE]: UPS kVa vs kW > It means the maximum power drawn is 1.4kW at a power factor of at most > 0.7. It also means that if the load is lower (than 1.4kW) then the > reactive power must be lower than 2.0kVA at all times. > > PC power supplies and monitor power supplies usually are not power factor > corrected (excepting recent expensive models), and have capacitive lead. > So running three standard PCs and three monitors off that ups would exceed > its VAr capacity although the Watts would be ok with room to spare. > > Interestingly things like fluorescent desk lamps help to compensate the > capacitive lead (they have inductive lag). > > Peter > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics