Hi Mac, yeah its confusing.
As far as I know, the fndc only controls the FNDC functions. its own internal AUX, and AGS % which you can control through the inverter relay or the FNDC relay. All the other AUX relay functions are controlled by the device the AUX is in. But I could be mistaken jay > On Jan 7, 2025, at 7:20 AM, Mac Lewis via RE-wrenches > <[email protected]> wrote: > > Hi Jay, > > Adding some nuance here, and I could be mistaken about all of the functions > that get taken over by the FNDC voltage. > > When you calibrate the FNDC, it "shows" the voltage on the Mate as the FNDC > voltage if there is an FNDC in the system. I also believe that it defaults > to the FNDC voltage for some logic operations like AGS voltage starting etc. > I am not certain that LBCO uses the inverter voltage or the FNDC voltage, > probably the inverter voltage. I assume that all Mate operations default to > FNDC voltage. I would also assume that the aux relay will rely on the charge > controller voltmeter driving the relay. > > One way to detect calibration issues is looking at the device status pages on > Optics. Each device will show a voltage and that will correspond to the > device. If something looks very different, it may be worth calibrating. I > have found most of the devices need calibrating at some point, charge > controllers, inverters and the fndc. > > There are certainly voltmeters on each device, but I think some of the logic > is affected by uncalibrated FNDC and I have found it very helpful to > calibrate it carefully if I'm installing Lithium. Certainly, your SOC > calculation needs a calibrated FNDC. > > > > On Tue, Jan 7, 2025 at 6:58 AM Jay via RE-wrenches > <[email protected] > <mailto:[email protected]>> wrote: >> Hi Mac >> >> I’m >> Going to disagree. The FNDC only provides its voltage it doesn’t populate to >> the other devices. >> You still have to set the inverter and CC separately, a poor design. >> >> Depends on which mate you’ve got where the fndc voltage is located. >> >> >> One reason I don’t like the CC voltage for aux control is that it gets off >> while higher charging due to VD. And with lithium which spend almost no time >> at lower absorb amps, it could effect the actual end volts. >> >> >> And for whatever reason I have definitely had CC accuracy wander over time. >> IE the voltage calibration gets off for some reason. >> >> Depending on the exact lithium, might not be a problem, some have wider >> upper limit than others. >> Jay >> >> >> >> >> >>> On Jan 7, 2025, at 3:47 AM, Mac Lewis via RE-wrenches >>> <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> >>> Hi Bill, >>> >>> Do you have a flexnet in the system? >>> >>> I assume that it wouldn't matter if the FM80 is calibrated but you will >>> want the flexnet perfectly calibrated if you are using Lithium. It's a >>> very annoying but worthwhile process. Don't drop the little nuts. >>> >>> Here is a paper on the procedure: >>> >>> https://www.outbackpower.com/downloads/documents/appnotes/fndc_field_cal_app_note.pdf >>> >>> The flexnet acts as a master voltage device so the system will default its >>> voltage readings to the flexnet voltmeter. I'm not sure if the aux >>> function of the FM80 uses the FM80's voltage or the flexnet voltage to >>> drive the relay, but this could explain the issue. >>> >>> Good luck! >>> >>> On Mon, Jan 6, 2025 at 10:51 PM Bill Battagin via RE-wrenches >>> <[email protected] >>> <mailto:[email protected]>> wrote: >>>> Hey Mac, >>>> >>>> I've tried to calibrate the voltage displayed on the Mate with >>>> the Fluke on the battery bus bars but it doesn't seem to take after the >>>> adjustment in "calibrate". But The Flexmax 80 does calibrate perfectly to >>>> the actual battery voltage and its in the FM80 aux landing that I'm using >>>> for this go-around to shut down the inverter to save the batteries. >>>> >>>> 'Manually' meaning.....? >>>> >>>> Thanks, >>>> >>>> Bill >>>> >>>> Feather River Solar Electric >>>> Bill Battagin, owner >>>> 4291 Nelson St. (Shipping) >>>> 5575 Genesee Rd. (USPS, UPS) >>>> Taylorsville, CA 95983 >>>> 530-284-7849, 258-1641(cell) >>>> CA. C10 Lic # 874049 >>>> Solar Powered since 1982 >>>> Home of the Sunny Side Up >>>> On 1/2/2025 5:53 PM, Mac Lewis via RE-wrenches wrote: >>>>> Hi Bill, >>>>> >>>>> Are all your voltages calibrated? Mate, Flexmax, FM80? Where are you >>>>> reading the voltages? >>>>> >>>>> Does it work OK manually? >>>>> >>>>> >>>>> >>>>> On Thu, Jan 2, 2025 at 12:08 PM Jay via RE-wrenches >>>>> <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>>> Simpliphy has a very high voltage LVD. >>>>>> And the older OB can’t be programmed to those voltages >>>>>> >>>>>> >>>>>> >>>>>>> On Jan 2, 2025, at 10:04 AM, Tyrone Houck via RE-wrenches >>>>>>> <[email protected] >>>>>>> <mailto:[email protected]>> wrote: >>>>>>> >>>>>>> >>>>>>> Forgive my ignorance but why won't the vfx lbco work for lithium? >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Thu, Jan 2, 2025, 8:19 AM Bill Battagin via RE-wrenches >>>>>>> <[email protected] >>>>>>> <mailto:[email protected]>> wrote: >>>>>>>> I am trying to use the "low battery disconnect" in aux mode in a newly >>>>>>>> installed OB FM80 CC for Li battery low voltage protection. I can't >>>>>>>> use >>>>>>>> the 19 year old OB VFX inverters for obvious reasons. The plan is to >>>>>>>> run >>>>>>>> the 12 volt output from the aux output to a NC relay to open it at 50 >>>>>>>> VDC of the bank of SimpliPhi 3.8M batteries. 50 VDC is SimpliPhi's >>>>>>>> recommendation for LVD. The "output" of the relay would be connected >>>>>>>> to >>>>>>>> the VFX's ON-OFF landings of that little green terminal block in the >>>>>>>> AC >>>>>>>> side of the inverter and just act as a simple switch for the inverter >>>>>>>> to >>>>>>>> turn it off to save the batteries. >>>>>>>> >>>>>>>> I'm using one of my newer FM80's as a test run and have >>>>>>>> programmed the voltages in Low Battery Disconnect mode and then put >>>>>>>> it >>>>>>>> in auto mode. However, as the CC goes below the voltage set point, >>>>>>>> the >>>>>>>> AUX output does not turn on (time set for 5 seconds), as evidence in >>>>>>>> the >>>>>>>> CC's home screen and by checking for 12V at the AUX terminal block. >>>>>>>> >>>>>>>> Any ideas of what I'm missing here to make this work? I >>>>>>>> know the other solution, thousands of $$ for new inverters which would >>>>>>>> be great but these folks have already invested quite a chuck on array >>>>>>>> replacement and charge controllers. >>>>>>>> >>>>>>>> Thanks for any experience with this. >>>>>>>> >>>>>>>> Bill >>>>>>>> >>>>>>>> Feather River Solar Electric >>>>>>>> Bill Battagin, owner >>>>>>>> 4291 Nelson St. (Shipping) >>>>>>>> 5575 Genesee Rd >>>>>>>> <https://www.google.com/maps/search/5575+Genesee+Rd?entry=gmail&source=g>. >>>>>>>> (USPS, UPS) >>>>>>>> Taylorsville, CA 95983 >>>>>>>> 530-284-7849, 258-1641(cell) >>>>>>>> CA. C10 Lic # 874049 >>>>>>>> Solar Powered since 1982 >>>>>>>> Home of the Sunny Side Up >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> This email has been checked for viruses by Avast antivirus software. >>>>>>>> www.avast.com <http://www.avast.com/> >>>>>>>> _______________________________________________ >>>>>>>> List sponsored by Redwood Alliance >>>>>>>> >>>>>>>> Pay optional member dues here: http://re-wrenches.org >>>>>>>> <http://re-wrenches.org/> >>>>>>>> >>>>>>>> List Address: [email protected] >>>>>>>> <mailto:[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. 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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 <http://www.members.re-wrenches.org/> >>>>>>> >>>>>> _______________________________________________ >>>>>> List sponsored by Redwood Alliance >>>>>> >>>>>> Pay optional member dues here: http://re-wrenches.org >>>>>> <http://re-wrenches.org/> >>>>>> >>>>>> List Address: [email protected] >>>>>> <mailto:[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 <http://www.members.re-wrenches.org/> >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> >>>>> >>>>> >>>>> Mac Lewis >>>>> >>>>> "Yo solo sé que no sé nada." -Sócrates >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> List sponsored by Redwood Alliance >>>>> >>>>> Pay optional member dues here: http://re-wrenches.org >>>>> <http://re-wrenches.org/> >>>>> >>>>> List Address: [email protected] >>>>> <mailto:[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. 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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 <http://www.members.re-wrenches.org/> >>>> >>> >>> >>> >>> -- >>> >>> >>> >>> Mac Lewis >>> >>> "Yo solo sé que no sé nada." -Sócrates >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> <http://re-wrenches.org/> >>> >>> List Address: [email protected] >>> <mailto:[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 <http://www.members.re-wrenches.org/> >>> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> <http://re-wrenches.org/> >> >> List Address: [email protected] >> <mailto:[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 <http://www.members.re-wrenches.org/> >> > > > > -- > > > > Mac Lewis > > "Yo solo sé que no sé nada." -Sócrates > > _______________________________________________ > 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. 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