[RE-wrenches] Outback AC Coupling

[jerrysgarage01]

KirpalWe have used tge solid state contactors but have not been happy with there reliability as they ofen have failed in the open position, the old coil contactors have been far better over time and seam to cost less. FYI, the solid state high amp contactors live longer with a heat sink.Jerry


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-------- Original message --------
From: jryago at dtisolar.com 
Date: 2/5/18  5:28 PM  (GMT-10:00) 
To: RE-wrenches <re-wrenches at lists.re-wrenches.org> 
Subject: Re: [RE-wrenches] Outback AC Coupling 

We have installed a number of AC coupled systems over the years and believe we may have some of the first systems installed.  Several are over 15 years old now and represent multiple brands and combinations of inverters.  None of these systems relied on frequency shift by battery inverter to force solar inverter off line.  So far no problems.
All of these systems utilized a 30 or 60 amp power relay having a 120 vac coil controlled by a smaller control relay having a 12 vdc coil directly controlled from aux. relay contacts in inverter.  High battery voltage triggered array disconnect from secondary breaker panel on output side of battery inverter.  Only design issues are getting a fail-safe arrangement of the N.O. and N.C. relay contacts correct, and program settings to avoid boiling AGM batteries.
Jeff Yago
Sent from my iPad
Jeff Yago DTI Solar. Inc.804-457-9566jryago at dtisolar.com
Although no trees were killed in the sending of this email, a largenumber of electrons were terribly inconvenienced..... 
On Feb 5, 2018, at 10:04 PM, Kirpal <solarworks at gmail.com> wrote:

Hi Folks.....Outback no longer supports AC coupling on their Radian systems.  My understanding is that it is because of the unreliability of the ROCB (remote operated circuit breaker) they were using.  I have heard that they are imminently going to release a white paper about AC coupling using a solid state relay instead.  I was wondering if any of you have done this?  Do you have any advice about the settings for the Auxiliary output settings that control the relay?  Looking for programming advice on the mate 3.  I talked to Outback today and they said until the white paper is released they won't be giving instructions or advice on this capability.  They did tell me not to use the AC couple mode already programmed into the mate 3 auxiliary output control. Thanks in advance for any advice! On or off list!!Cheers.
Sunny Regards,
Kirpal KhalsaOregon LRT#25
NABCEP Certified PV Installation Professional
Oregon Solarworks LLC
www.oregonsolarworks.com
541-299-0402

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