[RE-wrenches] stacking grid tied Outback

[Darryl Thayer]

Yes and No -- you can parallel all the inverters on the AC grid side, but then only two can be set up to run critical circuits. Or you can have as many run critical circuits, but then only two can send to grid.   So the problem is the functionality when you want dual purpose system.

Outback is working on this improvement.  

DT 

--- On Thu, 6/25/09, Jeff Yago <jryago at netscape.com> wrote:

> From: Jeff Yago <jryago at netscape.com>
> Subject: Re: [RE-wrenches] stacking grid tied Outback
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Thursday, June 25, 2009, 3:57 PM
> 
> Got a call to check out an existing, but distant system
> that a  elderly couple spent over $200K for a
> pv/battery/wind system and system never worked right. 
> Local electrician called to advise many design and wiring
> problems and suspects orignial installer had no clue.
> 
> I have not seen the system yet, but was told he has ten
> (10) Outback inverters, 2 configured for sell back and 8
> not.  He said they called Outback and received 2
> differnet recommendations concerning conversion of remaining
> 8 inverters to grid tie.  Was told they could be
> factory re-configured to all sell back, but can only stack
> two inverters in sell mode.
> 
> If true, why can't you just parallel multiple stacks of
> dual inverters and just feed each pair to their own circuit
> breaker in the main panel?  We parallel Fronius
> inverters all the time with no problem as long as wire runs
> are short.
> 
> Bottom line - note sure what we will suggest until I check
> it out tomorrow, but wanted to be able to advise which
> answer they received from Outback was
> correct.   
> 
> Thanks,
> 
> Jeff Yago
> 
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