Thanks, Darryl... I'm not that smart, If I were I'd be retired by now!!! I'm just relating what I've seen over the past three decades...
On Sat, Feb 22, 2025 at 8:35 AM Darryl Thayer via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Would you be able to do this with the Morningstar relay driver? The relay > closes and starts the generator when the battery voltage reaches a certain > level. The following is an inferior idea; use an Egauge in particular if > you want to do other monitoring, and have the Egauge with a relay driver > close the generator start switch. > > Also, pay attention to Steve Higgens Ideas > > On Sat, Feb 22, 2025 at 7:08 AM Jason Szumlanski via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> I have been thinking a lot recently about the reasons off-grid systems >> can shut down, and working on strategies to prevent these nuisances that >> require manual intervention. >> >> Ideally, a BMS should never shut down due to low voltage/SOC because a >> properly programmed inverter should reach it's cut off well before the BMS >> decides it needs to protect the battery, especially where there is closed >> loop communication. But let's say that happens, where the BMS does make the >> DC battery output go to zero. >> >> It seems to me like the inverter should be able to start a generator, and >> then signal to the BMS that a charging source is available. But I'm not >> aware of any system that actually does this. The inverter should be able to >> wake up the battery. I can see this being particularly possible where one >> manufacturer is writing the code (I'm thinking Midnite AIO/Powerflo). >> >> Of course, the inverter would have to have power in order to do that, so >> if it's nighttime and there is no PV, the inverter power would need to come >> from somewhere. I have two thoughts. First, someone could manually start >> the generator, waking up the inverter, but they would not have to reset the >> BMS if the inverter told it to wake up. The second way would be for the >> inverter to somehow close the 2-wire start circuit upon inverter shutdown, >> restoring power to the inverter automatically. >> >> If those are not options, an external NO relay powered by the inverter >> output could be added to the 2-wire start circuit, perhaps with a time >> delay to return to the NO position to allow the generator to remain powered >> until the inverter does it's thing and starts charging the batteries. >> >> Anyway, my question is whether any inverter/battery combination out there >> works in a way that the inverter tells the battery there is a charging >> source available to wake up the BMS and reconnect DC power. And if not, why? >> >> Jason Szumlanski >> Florida Solar Design Group >> _______________________________________________ >> 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. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> 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: 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. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > 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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