Subject: RE: UPS as a stand alone inverter? [RE-wrenches]

[Dan Duffield]

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The large zero transfer time UPS systems, that I am familiar with use 
IGBT's.  Our experience with large battery banks led us to the opportunity 
to become an authorized local service provider for the Mitsubishi line of 
UPS systems from 10KVA units (2033c unit) to the 500KVA units (9800 unit). 
These are the finest - large and cleanest engineered inverters i have seen.
	However, these purposely designed units would/could work well - only if 
your pv/solar system unit ALWAYS had a significant power draw on them, they 
are simply not intended for minimal quiescent power draw. They are always 
on. I guess they could be used on a solar powered hotel in Las Vegas, or 
some commercial resort facility.  They can be paralleled for significantly 
larger sized systems as well.  They are designed for very significant 
reliability. The AC in to dc battery charging circuits in them are 
relatively small in proportion to there normal KVA ratings.  They have very 
large monster contactors in them and do some very elegant switching, and 
the sine waves they produce are ultra clean. The larger units are indeed 
very impressive inverter units. I have heard that next year that Mitsubishi 
will introduce there own grid intertie inverter, but have no details yet. 

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