Off grid Islanding [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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Ray -

I think your ideas good - but there is a lot of confusion out there as 
to what the SMA Sunny Island inverter is capable of doing in a system 
like this.  

The SMA Sunny Island is very similar to an OutBack FX or the old Trace 
SW series inverter/charger.  It is a battery-type inverter which is 
Bi-directional.  It is not able to "sell" power back to the utility grid 
though - it can be used to "create" a local grid which then you can 
connect SMA Sunny Boy grid-tie inverters to create an "islanded" power 
system - i.e. an off-grid system with AC-coupled power sources.  

I think what your considering is putting the PV array near the pool and 
maybe using regular grid-tie type SMA Sunny Boy inverters to allow long 
distance transmission of the power to the main SW based system.  This 
can work - in fact it has been done with using SW's as the "utility 
grid" by a few with some success.  I know it works with the OutBack FX 
series as well.

The real issue is that even with the Sunny Boys added to the system the 
entire AC load needs to be able to run off the capacity of the main 
battery inverter in case a cloud comes over or the Sunny Boys shut down. 
 

In my opinion doing the DC pumps direct from the PV array makes the most 
sense to me.  

Christopher

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

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