I have to agree with Dave on this, complex and off grid generally are not good together, l sugest backing up and you might consider a redesign, dump enphase, go directly in to the inverter DC side, now a gen set back up will work. Your spending more time and effort going in a bad direction. AC coupling for resi is not a great solution to start with and Solark even say that. KISS is better Jerry NABCEP PV Inspector
On Thu, May 6, 2021, 7:33 AM Dave Angelini Offgrid Solar < offgridso...@sti.net> wrote: > I would not do any of this for an offgrid client. It is against the rule > of less is more. The whole design is flawed in my opinion. > > > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> > e-mail offgridso...@sti.net <offgridso...@sti.net> > text 209 813 0060* > > On Tue, 4 May 2021 19:24:13 -0400, 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 * [image: Sungineer Solar] >>>> 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. 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