diffrence is transfer time or switch time.in online ups the o/p come alwyas by inverter section that means always from battery. that menas i/p and charging section is seperate .so there is no connection between i/p and o/p .so there is no transfer when power is off .where as in off line ups o/p come by filtering i/p and when power goes off then inverter section is on and o/p comes by battery..so there is some transfer time in off line ups
Answered by
enviornment
at
12:54 PM on December 05, 2007