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</style>You customer might consider using two Sunnyislands instead of a transformer.<br>
I used the Sunnyislands without 485 and it still backed of the grid tie inverters. 485 let's the SI put the grid tie inverters in off grid mode, making them less sensative to the UL parameters.<br>
David<br>
<br>
Sent from my HTC smartphone on the Now Network from Sprint!<br>
<br>
<br>
<div id="htc_header" style="">----- Reply message -----<br>
From: "Kirk Herander" <kirk@vtsolar.com><br>
To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org><br>
Subject: [RE-wrenches] AC coupling and Outback inverters<br>
Date: Fri, Oct 5, 2012 5:08 am<br>
<br>
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<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">I am leaning towards the SunnyIsland. I assume it backs off the SunnyBoy via RS485 communications and the factory 240 xformer is a plus. The Outback setup might be a little less expensive, but
as you say a bit of a kludge. I guess I still need the charge controller for the new PV, as the SunnyIsland doesn’t regulate that.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">Kirk Herander<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">VT Solar, LLC<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">dba Vermont Solar Engineering<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">NABCEP<sup>TM </sup>
Certified installer Charter Member<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">NYSERDA-eligible Installer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">VT RE Incentive Program Partner<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D">802.863.1202<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:14.0pt;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>David Katz<br>
<b>Sent:</b> Friday, October 05, 2012 2:11 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] AC coupling and Outback inverters<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Hi Kirk,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">All of the Outback inverters will work AC coupled (GT and FX) as will any bi-directional H-bridge type inverter. I have used old Trace SW’s, SunnyIsland, Apollo TSW, Magnum
AE and now I am using an Outback Radian to do exactly what you are talking about. I have 6 kW of grid tie inverter and an additional 4kw of modules running through a Xantrex 600 volt charge controller to the batteries that the Radian runs on. It all works
flawless as long as you have a provision for protecting the batteries when the gid is down and the grid-tie PV system is making more power than the loads are using.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">If the customer has SMA inverters, I would recommend using a SunnyIsland because the battery control when the grid goes down is so elegant. Everything else is a bit of a
kludge.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">David Katz<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">CTO & Founder<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">AEE Solar Inc<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">P: 707 825-1200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">F: 707 825-1202<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""><a href="mailto:dkatz@aeesolar.com">dkatz@aeesolar.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""><a href="http://www.aeesolar.com">www.aeesolar.com</a><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<span style="font-size:12.0pt;font-family:"Arial","sans-serif""> </span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
<a href="mailto:[mailto:re-wrenches-bounces@lists.re-wrenches.org]">[mailto:re-wrenches-bounces@lists.re-wrenches.org]</a>
<b>On Behalf Of </b>Kirk Herander<br>
<b>Sent:</b> Thursday, October 04, 2012 2:11 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> [RE-wrenches] AC coupling and Outback inverters<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt">I have AC-coupled an Outback quad-stack with multiple SunnyBoy 6000US inverters and it’s been running fine for 4 years. I used the off-grid version of Outbacks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Now I have an application where a customer wants to add battery backup to an existing SunnyBoy 5000US system. And expand his array by a couple KW. So I’m thinking of using a GT Outback w/ batteries to handle
the critical loads and feed the extra 2kw of PV (charging the batteries through an MX60) to the grid. And I’d like to AC-couple the SunnyBoy so the original 5 kw array can also charge the batteries, BUT I remember, at least I think so, that the GT inverter
cannot be AC-coupled, only the off-grid version. Is this correct? Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Kirk Herander<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">VT Solar, LLC<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">dba Vermont Solar Engineering<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">NABCEP<sup>TM </sup>Certified installer Charter Member<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">NYSERDA-eligible Installer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">VT RE Incentive Program Partner<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">802.863.1202<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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