<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Set the Gen\u2019s frequency above or below the 3 +/- of the acceptance window of your micro inverters.<div class=""><div><blockquote type="cite" class=""><div class="">On May 4, 2021, at 7:24 PM, Dave Tedeyan <<a href="mailto:dave@sungineersolar.com" class="">dave@sungineersolar.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="auto" class="">I suppose the question here is - which is the worse failure mode? <div dir="auto" class="">A. Solar turning off until an electrician can fix it.</div><div dir="auto" class="">OR</div><div dir="auto" class="">B. Not knowing the contactor failed until it does not open when the generator turns on and running the risk that the solar backfeeds the generator and breaks it.</div><div dir="auto" class=""><br class=""></div><div dir="auto" class="">For off-grid maybe A would be more of a concern. But for grid tied, I would think option B would be worse.</div><div dir="auto" class=""><br class=""></div><div dir="auto" class="">Does anyone have a fail safe method of doing this?</div><div dir="auto" class=""><br class=""></div><div dir="auto" class="">Cheers,</div><div dir="auto" class="">Dave</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 4, 2021, 4:41 PM Chris Schaefer <<a href="mailto:chris@solarandwindfx.com" class="">chris@solarandwindfx.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">Jason,<div class=""><br class=""></div><div class="">A valid concern which is why I always wire them as powered open so if there is a failure it would transition closed or not open.</div><div class=""><br class=""></div><div class="">Christopher</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 4, 2021 at 4:15 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank" rel="noreferrer" class="">jason@floridasolardesigngroup.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto" class=""><div class="">What happens when the contactor fails? I don't trust a NC contactor that is supposed to open on 240Vac coil voltage from the generator. It's not a failsafe solution. <div dir="auto" class=""><br class=""></div><div dir="auto" class="">Jason</div><div dir="auto" class=""><br class=""></div><br class=""><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 4, 2021, 3:15 PM Drake <<a href="mailto:drake.chamberlin@redwoodalliance.org" target="_blank" rel="noreferrer" class="">drake.chamberlin@redwoodalliance.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div class="">
P.S. The contactor method is even mentioned somewhere in the Outback
literature. I've been using it for years. It is very simple and requires
no complex equipment. It will not interfere with rapid shutdown. 40 A,
240 V contactors with 240 V coils are readily available and not terribly
expensive. The 240 V output of the generator circuit provides the signal.
<br class=""><br class="">
At 10:02 AM 5/4/2021, you wrote:<br class="">
<blockquote type="cite" class="">Get a contactor with a 240 VAC
coil. Connect the coil wire wires to the 240 V output circuit of the
generator, so when the generator comes on, the contactor opens. Run the
current from the AC coupled Enphase inverters through the contacts from
common to N/C. <br class="">
<br class="">
---<br class="">
<br class=""><br class="">
<br class="">
On 2021-05-03 10:26, Dave Tedeyan wrote:<br class="">
<blockquote type="cite" class="">Hi All, <br class=""><br class="">
I am planning on using a Sol-Ark for the first time for adding battery
backup to an existing system. It is Enphase, so clearly it will be AC
coupled, and there is a whole house generator. When I talked to Sol-Ark
about it, they recommended putting the generator on a time of use
schedule to not allow it to come on during the day so that we don't run
into the issue of the solar backfeeding the generator.<br class="">
<br class="">
I was wondering though if anyone has just used a contactor to cut out the
solar when the generator turns on? Something like Outback's
GS-AC-Gen-Kit, although in this case I will need something rated for just
over 30A. This seems like a better way to allow the generator to run at
any time it is needed, especially if it is a gloomy, snowy, winter
day.<br class="">
<br class="">
Cheers, <br class="">
Dave<br class="">
<br class="">
-- <br class="">
<b class="">Dave Tedeyan, PE<br class="">
</b>
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</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><p style="text-align:center" class=""><span style="font-size:10pt;color:rgb(31,73,125)" class=""><font face="Arial, sans-serif" class="">Chris Schaefer\u2019s<br class=""></font></span><a href="http://www.solarandwindfx.com/" style="font-size:12.8px" target="_blank" rel="noreferrer" class=""><img src="http://www.solarandwindfx.com/wp-content/uploads/2015/01/Solar-Wind-FX-Logo.png" width="200" height="40" style="color:rgb(31,73,125);font-family:Arial,sans-serif;font-size:10pt" class=""></a><br class=""><i class=""><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)" class=""><span style="font-size:9pt" class="">Tel/Fax
585-229-2083 or Cell 585-748-1870 </span><span style="font-size:12px" class=""><br class=""></span></span></i><i style="font-size:12.8px" class=""><span style="font-size:10pt" class=""><font color="#1f497d" class=""><font face="Arial, sans-serif" class="">5115
South Hill Road ~ Canandaigua New York 14424<br class=""></font></font></span></i><i style="font-size:12.8px" class=""><span style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(31,73,125)" class=""><a href="http://www.solarandwindfx.com/" target="_blank" rel="noreferrer" class=""><span style="color:blue" class="">www.solarandwindfx.com</span></a> ~ E-mail: <span style="color:blue" class=""><a href="mailto:chris@solarandwindfx.com" target="_blank" rel="noreferrer" class="">chris@solarandwindfx.com</a></span></span></i></p><p style="text-align:center" class=""><i class=""><span style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(31,73,125)" class=""><img src="http://solarandwindfx.com/wp-content/uploads/2015/01/certs.jpg" width="200" height="56" class=""><br class=""></span></i></p><p style="text-align:center" class=""><span style="font-size: 10pt; font-family: Arial, sans-serif;" class="">Thomas Jefferson,
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