It is interesting that a couple people mention the FNDC. It seems that completing the charge parameters sets off the issue. I am also toying with lowering the end amps or something like that so that it is less likely that the system would ever get to a full charge. Although, I realize that may end up overcharging the batteries when the grid is down...
I did finally get a hold of someone from Outback who suggested updating the firmware on the Mate3. If that does not work then I'll have to somehow coordinate to be there at a time that the problem is occuring and also schedule a call from Outback at the same time. Disconnecting the FNDC or a factory reset are also good ideas. Cheers, Dave On Fri, Sep 26, 2025, 5:38 PM Jay via RE-wrenches < [email protected]> wrote: > I have a few out there all offgrid, so this particular issue I e not seen > > But I have had all sorts of weird issues that occurred long after any > changes to the system. AGS was a big one. > After I double checked all the settings I usually resorted to a full > factory reboot of everything. > > And that usually fixed it. > > Good luck > > Jay > > > > On Sep 26, 2025, at 3:26 PM, scot.arey--- via RE-wrenches < > [email protected]> wrote: > > > I don't have but two paralleled Radian systems but I removed the FNDC in > those. While I REALLY want to love and use the FNDC, I feel like that gives > unintended issues in more complex systems. > > *Howard "Scot" Arey* > *Owner, Solar CenTex* > 254-300-1228 > > ------------------------------ > *From:* RE-wrenches <[email protected]> on behalf > of Steve Higgins via RE-wrenches <[email protected]> > *Sent:* Friday, September 26, 2025 4:01 PM > *To:* RE-wrenches <[email protected]> > *Cc:* Steve Higgins <[email protected]> > *Subject:* Re: [RE-wrenches] Dual radian system stopping selling on sunny > days > > Dave, I've had the same thing happen with a couple of systems... > > Do you have the FNDC installed? > > Outback wont admit it but I think that there is a software conflict > between the FNDC and the radian firmware. > > The only way I could get it to stay in sell mode was to remove the FNDC. > > *Steve Higgins* *⋅* *Technical Services Manager* > *t* +1.902.597.4020 *m* +1.206.790.5840 > *f* +1.902.597.8447 *e* [email protected] > ------------------------------ > CONFIDENTIALITY: The information transmitted herein is intended only for > the addressee and may contain confidential, proprietary and/or privileged > material. Any unauthorized review, distribution or other use of or the > taking of any action in reliance upon this information is prohibited. If > you receive this email in error, please contact the sender and delete or > destroy this message and all copies. > ------------------------------ > > > > On Fri, Sep 26, 2025, 10:53 AM Dave Tedeyan via RE-wrenches < > [email protected]> wrote: > > To the Outback extraordinaires, > > I've got a dual radian, grid tied system that has been in service for > about 9 years. Recently, it has started this behavior where it will stop > selling to the grid on sunny days. Looking back at the data, this has > happened intermittently and very infrequently a couple years ago. But now > we are at the point where it happens every sunny day. Once the batteries > get up to fully 100% charged (not 99%), the selling stops and the system > only harvests enough solar to cover the backed up loads. > > I got a hold of the USB card data. It appears that the inverter goes from > "Sell Enabled" to "Offset" when this happens. I cannot tell whether the > inverter randomly decides to switch mode and then stop selling, or whether > it is the stopping selling that puts it in "Offset" mode. The sell voltage > is set at 52V, and float is set to 54.4V. It looks like the batteries are > generally sitting around 54V when this happens. Once the inverter enters > "offset" mode, then the battery voltage stays steady at 54.0V > > Does anyone have any idea what can be causing this to happen? > Cheers, > Dave > > -- > > [image: Logo] <https://www.sungineersolar.com/> > Dave Tedeyan, P.E. > Owner | Sungineer Solar > p: he | him | his > a: 1653 Slaterville Rd. > <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g> > > <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g>| > Ithaca, > NY 14850 > <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g> > w: www.sungineersolar.com <http://www.sungineersolar.com/> > c: (607) 270-0370 > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > 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/[email protected]/ > 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: [email protected] > > 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/[email protected]/ > 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: [email protected] > > 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/[email protected]/ > 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 > >
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