Outback Inverters - Master / Slaving [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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I forgot to comment on this section of Gary's posting:

Windstream Solar-Gary wrote:
> I'm attracted to the technology in this product, but am concerned about 
> what would happen if one of the inverters in this quad stack goes down. 
> Yes, it's nice to watch the HUB10 scanning away--but what if something 
> in this complex integrated system gets sick? How about some procedures 
> (that my clients can understand) to run a minimal system on 1 inverter 
> if the hub goes down, or on 2-3 inverters if one or two go down or one 
> quits? And what if it's the Master? What-if's and clear documentation 
> matter so much when the lights go out...

The design of the OutBack FX inverter stacking "network" is designed to 
allow for as much fault tolerance as possible - for example a slave 
inverter can be shutdown, removed and restarted while the system is 
running loads without any problems occurring...  This is one of the 
reasons that there was a significant delay in getting the HUB on the 
market - we had found a flaw in the approach which allowed a failed unit 
to shutdown the system (which we corrected in the final design).  The 
inclusion of the X-240 also makes the system more fault tolerant as 
well.

The HUB itself has two different communication paths - the one used for 
stacking is independant of the MATE's communication - so an electrical 
failure of the MATE/HUB is not likely to cause a failure of the stacking 
system.  The work the MATE does simply improves the operation of the 
stacked system - so a stacked system works without the MATE - just not 
as well under some specific conditions (such as charging).  

Failure of a MASTER FX inverter will shut down the system - but 
remastering the stacked system is pretty straight forward - I have 
talked one customer through doing it already (the problem ended up being 
a damaged CAT5 cable, BTW) and I advise, for now, telling the customer 
to call us directly.  We will be coming out with more documentation 
(Robin is really on my a** now to get it done - Thanks!) so keep 
posted...

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

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