[RE-wrenches] stacking grid tied Outback

[Randy Hatch]

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
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-----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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