[RE-wrenches] stacking grid tied Outback

[Darryl Thayer]

All inverters can be paralled on the output side, AC side no problem, it is the inputs that you can not Parallel--This will distroy the inverter
DT

--- On Fri, 6/26/09, Randy Hatch <randy at third-sun.com> wrote:

> From: Randy Hatch <randy at third-sun.com>
> Subject: Re: [RE-wrenches] stacking grid tied Outback
> To: jryago at netscape.com, "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
> Date: Friday, June 26, 2009, 7:20 AM
> Jeff,
> 
> Could you expand on this comment, please:
> 
> "We parallel Fronius inverters all the time with no problem
> as long as wire 
> runs are short."
> 
> Perhaps I am confused.  How do you "parallel" the
> inverters?
> 
> Does the method satisfy 690.64 (B)(1) requirements for
> Dedicated Overcurrent 
> and Disconnect?
> 
> I am using NEC 2008.  Thanks for clarification.
> 
> Thank you,
> 
> Randy Hatch
> NABCEP #091308-28
> randy at third-sun.com
> www.third-sun.com
> p740-597-3111 x28, f740-597-9775
> 
> Clean Energy - Expertly Installed
> Please consider the environment before printing this
> e-mail.
> 
> 
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org
> 
> [mailto:re-wrenches-bounces at lists.re-wrenches.org]
> On Behalf Of Jeff Yago
> Sent: Thursday, June 25, 2009 4:57 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] stacking grid tied Outback
> 
> 
> 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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