I have a buddy in tech support at Fortress. I asked him and he said that elevated absorb volts above 55.2 could cause this situation. And then the power cycle would reboot the BMS.
I am presuming its open loop, and the fact you mentioned that there was more PV and then the shut down sure might be connected. You might check the charge voltages/time to make sure they are correct and I can’t remember if the classic has battery sense wire connections. jay > On Aug 27, 2024, at 2:51 PM, Ray Walters via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > > The SPD was on one of the PV inputs before it came into the house. There > were two Classics, each fed with its own PV input and SPD. It actually > caused an underground splice to fail (high resistance) which I replaced the > splice and restored full voltage, and both Classics were working fine. Just > seems unlikely ( but not impossible) that the surge would make it past the > Classic without damage, but then damage the Fortress BMS in an otherwise > imperceptible manner. That is our current best theory at the moment though. > I added an SPD on the 48 v buss, before this latest total shutdown. > > Ray Walters > > On 8/27/2024 2:35 PM, Dave Angelini Offgrid Solar via RE-wrenches wrote: >> When I have had someone lose an SPD (I assume it was on DC buss) there is >> often latent damage (shows up later) to many of the devices. In a Hi Rel >> mode, it is recommended to replace it all. Most offgrid is not that critical >> but try telling that to someone with rotten food. >> >> The freezers and reefers are often full of spoils that smells never go away. >> YUK ! >> >> Dave Angelini Offgrid Solar >> "we go where powerlines don't" >> <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ >> <https://offgridsolar1.com/> <http://members.sti.net/offgridsolar/> >> e-mail offgridso...@sti.net <mailto:offgridso...@sti.net> >> text 209 813 0060 >> >> >> On 2024-08-27 1:02 pm, Ray Walters via RE-wrenches wrote: >> >>> Greetings All; >>> >>> I have Fortress Battery installation with a pair of E Vault batteries set >>> up in a Master/ Slave arrangement. Its been working fine for over a year, >>> but the customer just had a complete shutdown of the batteries which left >>> multiple freezers, and refrigerator with rotting food. When he rebooted >>> the batteries by turning on/off the main breaker on each, they both come up >>> and showed 100% SOC on the Master, and 98% on the other. There were no >>> fault codes. I just recently installed a larger PV array, and so the >>> system has been reaching full charge every morning. >>> >>> I have multiple calls in to Fortress, but not hearing anything back from >>> them at all. We did have a lightning surge event a few months ago, that >>> damaged a Midnite SPD (first ever for me), and took out the control board >>> on the generator. One VFX inverter has an LED out, but we only use two >>> inverters of the Quad stack, so I just switched to another inverter. All >>> other equipment appeared fine: Midnite controllers, rest of the Outback VFX >>> quad stack, and never any issues seen with the Fortress batteries. >>> >>> The other odd thing, is since he rebooted the batteries, the system is >>> working fine, and recharging to 100% by 9:30 am as before. Is it >>> possible the Fortress BMS were damaged and are now having an intermittent >>> shutdown issue? I did ask him to temporarily disconnect the comms between >>> batteries, in case it is a bad BMS on one, it will isolate it from the >>> other. >>> >>> This is a tough one to figure out, since it hasn't happened again, and >>> there are no fault codes. The Mate 3 shows a low frequency AC code, but >>> that's usually just from the generator shutting down. Any help, ideas, >>> experiences, would be greatly appreciated. >>> >>> Thanks, >>> >>> Ray Walters >>> Remote Solar >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> <http://re-wrenches.org/> >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> <mailto:RE-wrenches@lists.re-wrenches.org> >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> <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/ >>> <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> <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: RE-wrenches@lists.re-wrenches.org >> <mailto:RE-wrenches@lists.re-wrenches.org> >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> <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/ >> <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> <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 > > 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. 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