AC coupling [RE-wrenches]

[Christopher Freitas --- OutBack Power]

Drake - 

We (OutBack) have had good success with AC coupling our inverters with a 
wide variety of battery-less grid-tie inverters - including PV Powered.  
We are at the point where we are pretty comfortable with just saying 
that it will work fine - give it a try... 

The only issue I have seen on a PV Powered AC coupled system was the 
interaction of their anti-islanding scheme with the voltage regulation 
of the VFX inverter causing a slight flicker on some of the lights.  It 
was tolerable - and was less of an issue when other loads were 
operating.  The customer found it to be slightly irritating but 
acceptable. 

I am not sure if the newer PV Powered models still use the same old 
anti-islanding scheme they used before. With other inverters (SMA, 
Magnetic, Fronius, etc.) we did not see this problem occur.  

Like with all AC coupled systems utilizing OutBack inverters - you will 
need to provide an additional mechanical relay or solid state relay 
controlled by our AUX output to manage the power once the battery gets 
full.  This can be done in a variety of ways - let me know if you need 
any assistance with deciding what is best for your application.  

Christopher


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


Drake Chamberlin wrote:
> Will any direct grid tie inverter AC couple with Outback inverters, 
> or is it necessary to test each model to see if wave forms are 
> compatible?  I'm interested in coupling the new PVP 1100 (not out 
> yet) with an Outback VFX3524 .


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