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Eaton put equipment on the Shuttle and ISS, race cars, truck turbos. The biggest my wife has sold is 80 kw, double online conversion. She used to be the APC NZ manager for about 8 years. She reckons Eaton are better. Been there just over two years now and APC in NZ are noticing her presence considerably. Eaton do the really big UPS's for Power stations, engineering construction. Her boss just installed 3 x 400 kwatt units, 1.2 megawatts in one installation.
Eaton do Line Interactive as well. LI means the UPS will intervene for small but significant drops or rises in voltage or frequency whereas the normal Standby UPS only acts if power drops out completely.
I'll ask her for a product number for an Eaton equivalent with Approx sine wave if you like, 1.2 kwatts ? from the APC #. I don't think Eaton do a 'square wave', it's actually stepped square wave which is ... approximated sine wave. Thats how it works but remember it is smoothed afterwards by caps and stuff. Number of steps is more important, the more the better the approximation.
'Square' vs "Approximation' is more a terminology difference, APC have their own 'language', Liz still uses it.
Eaton units also more efficient, conversion rates around 97% for smaller units like 1200 watts.
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