hybrid grid tie [RE-wrenches]

[Christopher Freitas --- OutBack Power]

Although the listings of the OutBack and SMA inverters do not include 
using them in this "island" configuration - there is nothing in the 
UL1741 standard that addresses this type of configuration.  I do not see 
any problem with using them this way - of course the inspector has the 
ultimate authority.  

I also do not think that it is a real issue to use the equipment this 
way - the outback inverter is operating simply as a UPS type device and 
the SMA is still operating as a grid-tie inverter (with all of it 
islanding protection systems unchanged).  When connected to the grid the 
OutBack inverter is basically just connecting the SMA to the grid 
through an internal contactor.  When a utility power outage occurs 
either the OutBack drops the grid and picks up the load and the SMA or 
the SMA drops off because of the islanding detection and then the 
OutBack picks up the load and the SMA eventually reconnects.  

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com  
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  

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