Outback with Sunnyboy [RE-wrenches]

[David Katz]

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Drake,
I have been doing the same thing for a couple of years.  The only thing 
to have to add is a way to turn off the output of the Sunnyboy when the 
batteries are fully charged and the grid is down. 
This is necessary when the grid is down because the inverters will 
charge batteries with the excess power generated through the array 
through the Sunnyboy.  Since you are feeding ac into the output of the 
Outback inverters, there is not charging control.  I used the auxiliary 
12 volt output to power a relay between the Sunny boy and the sub panel 
so that when the batteries reach a full charge voltage, the relay opens 
and the Sunnyboy thinks the grid is down and turns off.  The relay will 
close when the batteries drop in voltage and the Sunnyboy will think the 
grid is back on and its will send power to the sub panel again.  Voltage 
setting will depend on the type of battery you are using.  This system 
works great because you get the efficiency of the Sunnyboy plus backup 
power.
David

David Katz
AEE Solar, Inc.
formerly Alternative Energy Engineering
1155 Redway Drive - Box 339
Redway, CA  95560  USA
Phone 707-825-1200
Fax 707-825-1202
email david at aeesolar.com
www.aeesolar.com


 



Drake Chamberlin wrote:
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> Hi Wrenches,
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> We are planning to feed the grid with a pair of Stacked Outbacks and a Sunnyboy, which we would like to feed into the same subpanel.  The Outbacks will supply battery backup. The sub panel will feed the grid ahead of the service disconnect in the main panel.  
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> Does this create any islanding potential, or any other problems that anyone knows about?  
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> Thanks,
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> Drake 
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>   


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