Set the Gen’s frequency above or below the 3 +/- of the acceptance window of your micro inverters. > On May 4, 2021, at 7:24 PM, Dave Tedeyan <d...@sungineersolar.com> wrote: > > I suppose the question here is - which is the worse failure mode? > A. Solar turning off until an electrician can fix it. > OR > 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. > > For off-grid maybe A would be more of a concern. But for grid tied, I would > think option B would be worse. > > Does anyone have a fail safe method of doing this? > > Cheers, > Dave > > On Tue, May 4, 2021, 4:41 PM Chris Schaefer <ch...@solarandwindfx.com > <mailto:ch...@solarandwindfx.com>> wrote: > Jason, > > 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. > > Christopher > > On Tue, May 4, 2021 at 4:15 PM Jason Szumlanski > <ja...@floridasolardesigngroup.com > <mailto:ja...@floridasolardesigngroup.com>> wrote: > 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. > > Jason > > > > On Tue, May 4, 2021, 3:15 PM Drake <drake.chamber...@redwoodalliance.org > <mailto:drake.chamber...@redwoodalliance.org>> wrote: > 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. > > At 10:02 AM 5/4/2021, you wrote: >> 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. >> >> --- >> >> >> >> On 2021-05-03 10:26, Dave Tedeyan wrote: >>> Hi All, >>> >>> 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. >>> >>> 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. >>> >>> Cheers, >>> Dave >>> >>> -- >>> Dave Tedeyan, PE >>> >>> 1653 Slaterville Road, Ithaca, NY 14850 >>> Cell: 607-288-2898 >>> www.sungineersolar.com <http://www.sungineersolar.com/> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> <http://re-wrenches.org/> >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> <mailto:RE-wrenches@lists.re-wrenches.org> >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >>> >>> There are two list archives for searching. When one doesn't work, try the >>> other: >>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>> <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> <http://www.re-wrenches.org/etiquette.htm> >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> <http://re-wrenches.org/> >> >> List Address: RE-wrenches@lists.re-wrenches.org >> <mailto:RE-wrenches@lists.re-wrenches.org> >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> <http://www.re-wrenches.org/etiquette.htm> >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> <http://www.members.re-wrenches.org/>_______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > <http://re-wrenches.org/> > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> > > There are two list archives for searching. 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When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > http://www.members.re-wrenches.org <http://www.members.re-wrenches.org/> > > > > -- > Chris Schaefer’s > <http://www.solarandwindfx.com/> > Tel/Fax 585-229-2083 or Cell 585-748-1870 > 5115 South Hill Road ~ Canandaigua New York 14424 > www.solarandwindfx.com <http://www.solarandwindfx.com/> ~ E-mail: > ch...@solarandwindfx.com <mailto:ch...@solarandwindfx.com> > > Thomas Jefferson, the author of our great Constitution, once said, > "democracy" will cease to exist when you take away from those who are willing > to work and give to those who would not." > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > <http://re-wrenches.org/> > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> > > There are two list archives for searching. 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