[RE-wrenches] AC Coupling, inverter listings

[design]

Fellow wrenches,

	I have been following the AC coupling discussions with interest, and  
now have a site where this would make a lot of sense.  One question  
remains that I have not been able to answer by reading the archives I  
have found.  Since the AC circuit from the batteryless UI inverter  
actually passes through the backup inverter before landing eventually  
in the main panel, does the backup inverter have to have the same  
listings required of UI inverters for interconnection(UL and IEEE)?   
For example, in Outback's white paper, they show the backup inverter  
as an off grid unit in one drawing, and grid-tie unit in another.  Do  
both scenarios meet the code, as the generation (PV) is connected to  
a listed UI inverter?  Have any of you run into trouble with AHJs  
when installing these AC coupled systems for battery back up in grid  
tied residences?

Thanks,

Jim Grundy
NABCEP Certified Solar PV Installer
Vermont Solar Specialist Plumber PS-279
Elemental Energy, Inc.
1750 Clark Rd
E. Montpelier, VT   05651
802-476-3441 (p)
802-476-5680 (f )
802-272-8933 (c)


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