I would certainly agree with you all that AC coupled for off-grid is not the best design choice. But just for clarification, this is a grid-tied system where there is already an Enphase M215 system and a whole house generator set up. Cheers, Dave
On Fri, May 7, 2021 at 11:10 AM Jerry Shafer <jerrysgarag...@gmail.com> wrote: > 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. 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 >>>>> >>>>> _______________________________________________ >>>>> 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 >>>>> >>>> _______________________________________________ >>>> 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 >>> <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 >>> <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. 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 >> >> _______________________________________________ > 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 > > -- *Dave Tedeyan, PE* [image: Sungineer Solar] 1653 Slaterville Road, Ithaca, NY 14850 Cell: 607-288-2898 www.sungineersolar.com
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