Off grid Islanding [RE-wrenches]

[David Katz]

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Hi Ray,
I have connected Sunny Boy inverters directly to the output of Xantrex 
SW inverters and Outback inverters. It works well. The Sunny Boy 
operates when it sees the SW or Outback output.  Sometimes it shuts off 
when a large load, like a pump is applied to the circuit, because it 
looks like a grid failure. If the SB shuts off, it waits 5 minutes to 
turn on.  If there is no AC load on the system and the SB is supplying 
power, you will charge the batteries connected to the SW.  You need to 
put a voltage controlled switch to turn of the AC between the Sunny Boy 
and the sub panel if the battery voltage gets too high.

Grundfos makes a BMQE booster pump which has an SQE pump inside of a 
stainless tube to allow inline operation. this pump has no starting 
surge and would not cause a big strain on the inverter. They make sizes 
up to 30 GPM at 20 PSI .

Regards,
David Katz


Christopher Freitas --- OutBack Power wrote:

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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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-- 
David Katz
President, AEE Solar
formerly Alternative Energy Engineering
1155 Redway Drive - Box 339
Redway, CA 95560 USA
(707) 825-1200
(707) 825-1202
email: david at aeesolar.com
web: www.aeesolar.com

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