Need Xantrex help (again) [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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Bill Brooks wrote:
> I would agree that a single switch is needed for series stacked 
> inverters since shutting down one inverter could cause some issues. It 
> really depends on the design of the inverter, but two inverters 
> generally become one in a series stacked situation. Running them in a 
> different configuration, without knowing the consequences on the ac or 
> dc side seems pretty risky.

Yes - I agree - the issue with some inverters is that the inverter which 
is not not bypassed CAN run at its own frequency not sync'd with the 
other inverter - and your right that the issue isn't so much the 
bypasses as it is the inverter themselves being allowed to decide on a 
phase by phase basis as to what they should be doing (i.e. connected to 
AC, charging or inverting). The same issues occur with using two single 
pole input breakers or fuses instead of a common trip two pole breaker 
for a series stacked pair of inverters.   

We here at OutBack dealt with all of these issues in our series and 
three phase stacking systes - but I know other inverter manufacturers 
haven't dealt with this... nor apparently does UL understand the hazard 
which may occur.   

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

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