I don’t understand how 3 inverters on a single buss could be recording such wildly different dc voltage readings. Regardless if the inverters are independent or paralleled.
I don’t have those battereis specs but would expect absorb if there is any to be less than 90 minutes? Or did the issue occur at the exact end of absorb? What a pain. Jay > On Jan 24, 2026, at 1:36 PM, Jason Szumlanski via RE-wrenches > <[email protected]> wrote: > > > I have a triple stack of off-grid Midnite AIO connected to a 60 kWh > lithionics battery bank (51.2V LFP) in open loop. Today the site had BMS > shutdowns (there are two BMSs, one for each 30 kWh stack of batteries). Both > BMSs shut down about 90 minutes after the solar got the batteries to 100% and > were just meeting loads with solar. > > I got some data from Solar Assistant (attached) that shows erratic voltage > readings from each of the three inverters. This has never happened at this > site before. Some of the voltage readings exceeded 60V, which I am guessing > caused one or both BMS to shut off and come back on, possibly quickly. > > I do see some solar charging spikes, so it looks like the inverters would > detect a low battery state and start charging, raising the voltage of the > batteries quickly, and the process repeating itself. > > Any ideas on what the source of the problem might be? > > Thanks, > > Jason Szumlanski > Florida Solar Design Group > > > > <Image 1149.jpg> > <Image 1148.jpg> > <Image 1151.jpg> > <Image 1150.jpg> > _______________________________________________ > 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
