In the Classic the coin battery does not affect the solar programming of the unit, only the time and date. Did the FM have a date/time setting? I don’t recall for sure, if not it likely does not have a battery in the display. If only we could have boB back, he would know.
Sue Stankevitz MidNite Solar, Inc.<https://www.midnitesolar.com/index.php> (360) 403-7207 (XT122) [cid:[email protected]] From: RE-wrenches <[email protected]> On Behalf Of Tyrone Houck via RE-wrenches Sent: Sunday, January 11, 2026 11:48 AM To: RE-wrenches <[email protected]> Cc: Tyrone Houck <[email protected]> Subject: Re: [RE-wrenches] Outback Charge controllers resetting to default settings Hmmm. I don't know..the ones I've seen do it never actually lost power. I had two at the same site do it and my intuition was that the mate was somehow responsible. On Sun, Jan 11, 2026, 8:34 AM Zeke Yewdall via RE-wrenches <[email protected]<mailto:[email protected]>> wrote: One of my customers thinks it happens after the charge controller loses power due to a battery BMS shutdown. And the other one, it did happen on the charge controller that was disconnected for a while for a new array being wired in. So... I'm wondering, how does the FM100 store programming data? Is it in some sort of memory that requires power? And if so, does it have a coin battery in there or how does it remember the settings when battery power is removed? I know this is a common thing in old ham radios of a certain vintage, that they have an internal coin battery to remember settings and after 5 or 10 years, it has to be replaced. The Midnite Classics also have the coin battery in the display... so, does the FM100 have something like this? Zeke From: Tyrone Houck <[email protected]<mailto:[email protected]>> To: RE-wrenches <[email protected]<mailto:[email protected]>> Subject: Re: [RE-wrenches] Message-ID: <CAEqH54=dnxm-buzrijftd+zpnmkpe_haqy_7539ryxwcfdp...@mail.gmail.com<mailto:dnxm-buzrijftd%[email protected]>> Content-Type: text/plain; charset="utf-8" I have had that happen before on at least 3 different occasions. Specifically with the fm100. Totally random and couldn't come up with a logical explanation. I just reprogram and roll with it...always seemed odd though. _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: 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
_______________________________________________ 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
