I’ve used two SPDT relays, one for each phase. This gives double redundancy
Jay Peltz power. > On May 5, 2021, at 5:07 AM, Tump <t...@swnl.net> wrote: > > 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> >>>> 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> 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> 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 >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> List sponsored by Redwood Alliance >>>>>>>> >>>>>>>> Pay optional member dues here: http://re-wrenches.org >>>>>>>> >>>>>>>> List Address: RE-wrenches@lists.re-wrenches.org >>>>>>>> >>>>>>>> Change listserver email address & settings: >>>>>>>> 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/ >>>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>>> >>>>>> List rules & etiquette: >>>>>> http://www.re-wrenches.org/etiquette.htm >>>>>> >>>>>> Check out or update participant bios: >>>>>> http://www.members.re-wrenches.org >>>>>> >>>>> _______________________________________________ >>>>> List sponsored by Redwood Alliance >>>>> >>>>> Pay optional member dues here: http://re-wrenches.org >>>>> >>>>> List Address: RE-wrenches@lists.re-wrenches.org >>>>> >>>>> Change listserver email address & settings: >>>>> 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/ >>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>> >>>>> List rules & etiquette: >>>>> http://www.re-wrenches.org/etiquette.htm >>>>> >>>>> Check out or update participant bios: >>>>> http://www.members.re-wrenches.org >>>>> >>>> >>>> >>>> -- >>>> Chris Schaefer’s >>>> >>>> Tel/Fax 585-229-2083 or Cell 585-748-1870 >>>> 5115 South Hill Road ~ Canandaigua New York 14424 >>>> www.solarandwindfx.com ~ E-mail: 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 >>>> >>>> List Address: RE-wrenches@lists.re-wrenches.org >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> There are two list archives for searching. 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