Well, maybe you can find an owner who switches off all his devices that need protection and measures it that way. Unfortunately, I can't do that. I don't load the unit that heavily and have a stated autonomy of 68 minutes at 16-20% load. Roughly measured when the mains voltage is drawn: 140 watts to supply 90 watts to the secondary. Accordingly, this characteristic curve is somewhat very optimistic.
http://www.apc.com/products... But with UPS's this can fluctuate quite a bit in the background if the battery is to be kept somewhat fit.
