Howdy. We have a new 400 kva UPS installed. This unit appears to be drawing 180 amps at no load... BUT... We have analog metering on the main switchboard. When the UPS is energized we see an inrush of about 150 amps on the meter. And then the meter goes right back down to where it was before the unit was turned on. A few people didn't believe this meter so I took an RMS FLuke out to the pad mounted transformer feeding the switchboad, got on every one of the 6-500 MCM on phase C and took readings, added them up, and they pretty much matched the swiitchboard meter. We have never quite understood the large amps at no load for the UPS and the manufacturer can't explain it completely either. The unit's power factor is not real good at no load was one explanation.... But it is pretty unique to see this occur. Could the no load current be filled with harmonics that somewhat cancel out at the main board????