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Old August 9, 2012, 03:05 PM
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botat29 botat29 is offline
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I Google a little bit and I found a guy who test a APC and the output is sine wave

Line-Interactive UPS Switching Transients

Here HP describe and show few of their model

HP Parallel Uninterruptible Power System*-* Notice: Uninterruptible Power System (UPS) - Best Practices for Selecting an HP UPS - c02645781 - HP Business Support Center

and finally a guy test few APC, some have Sine other ( cheap ) have a square wave inverter

Power quality from various backup devices

Another one, the guy describe it as " AC output of an APC UPS in for new batteries, compared to the power converter, it is a near perfect sine output."

AC Output from UPS | Flickr - Photo Sharing!