Hi all, The response from Midnite: * On a PV insulation fault, only the pv shuts down. On other pv faults (I'm not sure what they would be) they say that it is required to shut off the AC. * In stacked systems, if one inverter errors off that does not bring down the other AIOs.
Howie On Thu, Oct 10, 2024, 7:19 PM jay via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Seems like this is a firmware setting and should be adjustable. If lo > > On Oct 10, 2024, at 3:59 PM, Lou Russo via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > Aloha All, > > Thank you Jason. This is a huge and surprising issue. So much so that I > dropped what I was doing and called Sol-Ark to confirm. Mind you this was > level 1 support, but I was told this is what the Sol-Arks are supposed to > do and it is a feature not a bug. Their take is if there is any fault on > any one string, the Sol-Ark assumes the worst and shuts everything down. > > I wonder what solutions could be implemented on future installs to prevent > this from happening? > > Aloha, > > Lou Russo > Owner > l...@spreesolarsystems.com > Office - 808 345 6762 > Spree Solar Systems LLC > CT-34322 > > > > On Thu, Oct 10, 2024 at 11:45 AM Jason Szumlanski via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> I think it's more likely water in a J-box or possibly physical damage, >> but someone passed by the property and did not observe any physical damage >> to the array. >> >> Jason Szumlanski >> Principal Solar Designer | Florida Solar Design Group >> NABCEP Certified Solar Professional (PVIP) >> Florida State Certified Solar Contractor CVC56956 >> Florida Certified Electrical Contractor EC13013208 >> >> >> On Thu, Oct 10, 2024 at 5:41 PM Jay <jay.pe...@gmail.com> wrote: >> >>> Jason >>> What’s the possibllity it was a lighting strike? >>> >>> Jay >>> >>> On Oct 10, 2024, at 2:57 PM, Jason Szumlanski via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>> >>> We have been talking a lot recently about all-in-ones. I just had a >>> massive fail during Hurricane Milton with a quad Sol-Ark 15K off-grid >>> system that deserves some discussion about whether AIO is a good idea if it >>> can't build in some resilience to errors. I'm not sure if the new Midnite >>> unit is better in this respect, but this is what happened to the Sol-Ark >>> system... >>> >>> Four inverters, each with 4 strings of PV paralleled to 2 MPPT per >>> inverter. One of the slave units developed some sort of PV DC fault during >>> the storm. This caused the slave inverter to shut down and throw an error, >>> which in turn caused a parallel fault across all four inverters. Power >>> output ceases at that point. Apparently the system keeps resetting because >>> I have a cell modem that uploads data to Sol-Ark, but that cell modem is >>> powered by the inverter outputs, so it must be getting power at least >>> intermittently. The rest of the loads are basically flatlined according to >>> the Sol-Ark data. It's mostly air conditioners, so they probably can't turn >>> on fast enough before the PV fault causes another shutdown. >>> >>> So, in essence, one of 16 strings of PV develops a fault, and that >>> causes all four inverters to malfunction? What is the point of redundancy >>> if a fault of one results in a fault of all?! If there is a true PV input >>> fault, shouldn't that just shut down that MPPT, or perhaps all of the PV DC >>> input to that inverter? And why can't this inverter continue to invert >>> power from the batteries and charge from a generator when there is a DC >>> input fault that could be programmatically isolated and ignored? >>> >>> This is a bad design in my opinion, and something I hadn't considered. >>> If the faulted inverter can't function with a DC input fault, it should >>> just take itself out of the game. (This is 120/240 split phase, BTW). Is >>> this how all AIO inverters work? One inverter fault on the DC side kills >>> all paralleled units' AC output? Not good. >>> >>> This is a completely off-grid system on a remote island with no vehicle >>> access, so it's not exactly easy to do a "truck roll" on this one, >>> especially post-hurricane. To make matters worse, the generator was running >>> at the time of the fault, as it was being signaled to run because the >>> battery had reached the assigned charge voltage. The fault also killed the >>> 2-wire start signal from the master, so the system also stopped passing >>> through generator power to the loads. The house is dark. >>> >>> >>> 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 >> >> _______________________________________________ > 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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