Hi William, I recently installed these connected to an FM100, and also on a couple grid tied systems in the past year. I think that as long as you are getting the expected 0.6V per module you know that everything is connected as it should be. Unfortunately I do not think that you will be able to do your other tests until the strings are terminated at the charge controller with the transmitter sending the keep alive signal. But then you can open up the fuses/breakers in your combiner to test strings one at a time. And once the system is running, you can obviously check that your strings have the same Vmp/Imp. If this is your first TS4-A-F installation, then some of it is just that, yes, these things do work when installed correctly. Hope this helps. Cheers, Dave
On Thu, Jul 6, 2023 at 1:12 AM William Miller via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Friends: > > > > We are in the midst of our first off-grid, DC coupled project using Tigo > TS4-A-F RSS switches. > > > > In my few years installing solar I am accustomed to testing PV strings > with a Fluke 87 for Voc, Isc, Vmp and Imp, or some combination. I do this > regularly in the midst of installing PV so I can be confident once we are > finished there will be no issues with the panels or the wiring. > > > > I understand these tests are not possible with the Tigo units. With the > circuits unterminated, I can see the 0.6 VDC/Tigo with no keep-alive signal > transmitted. With the signal being transmitted, I do not see the expected > readings for Voc. I get only the 0.6/Tigo. When shorted into the Fluke DC > input the Isc jumps around between 0 and about 2 amps. > > > > I was told by tech support the PV circuits need to be “terminated” at an > inverter before any voltage or current can be measured. The circuits do > not terminate in an inverter; they will connect to a charge controller > (FM100, in this case). > > > > We have not pulled the PV feeders so connecting to the charge controllers > is not yet possible. I am nervous about installing the remainder of the > modules without knowing for certain they will produce as they should. > > > > What would you all do to assure yourselves the PV will produce once > connected? > > > > TIA. > > > > William > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > _______________________________________________ > 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 > > -- [image: Logo] <https://www.sungineersolar.com/> Dave Tedeyan, P.E. Owner | Sungineer Solar p: he | him | his a: 1653 Slaterville Rd. | Ithaca, NY 14850 w: www.sungineersolar.com <http://www.sungineersolar.com/> c: (607) 270-0370
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