120/240 VAC inverter bypass system [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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William Miller wrote:
> This is a two SW installation.  Agreed, transferring individual legs is 
> not the best alternative, but with the complicated switching required to 
> remove the inverters while bypassing them-- well I don't know how else 
> to accomplish this in two interlocking poles.  Anyone else got any 
> better ideas?

Here you go - you simply use three 2-pole SquareD breakers and one 
interlock mechanism - there is a color wiring diagram on the OutBack 
website specifically on this configuration.  

http://www.outbackpower.com/pdfs_wiring_diagrams/AC-IOB-60D.pdf

With this configuration you can bypass the inverter but still let it 
charge from the AC source (i.e. generator).  Its a great trick when some 
load causes the inverter to drop the generator each time it kicks on - 
you might loose battery charging for a minute each time but the AC loads 
stay on the generator - good limp mode capability for what usually is a 
bad generator and not actually an inverter issue.  

This dual bypass system doesn't solve all the issues but is certainly 
better than using two separate bypasses.  The remaining issues are in 
the software of the inverter themselves and can't be fixed externally. 

We have several systems installed now with up to 10 OutBack inverters 
stacked (5 per phase - 120/240 vac - 36 kVA) with a single 120/240 VAC 
bypass switch arrangement.  For these big systems we use a separate 200+ 
amp ON-OFF-ON type manual AC transfer switch as the bypass... much 
cleaner wiring than this loop-around trick with breakers and interlocks. 
 

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

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