UPS power output waveform

Thread Starter

MrSoftware

Joined Oct 29, 2013
1,824
I'm just posting this for anyone who has been as curious as I have about what UPS output waveforms look like. I knew it wasn't a sine wave, and electric motors in particular really don't do well with it. But I wasn't expecting a square wave. I was also expecting a little more of a perfect sine wave from my utility. Anyway here's the output from an old APC 280 backups:

My utility power from the wall:
wall_power.png

UPS output no-load:
UPS_no_load.png

UPS output small fan as a load, probably 10-20 watts:
UPS_small_fan_load.png
 
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