Same with the Midnite AIO. They are very explicit in the instruction manual.
On Sun, Nov 10, 2024 at 9:23 AM James Jarvis via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > There isn't. It's a cultural thing. All of our Japanese machines have > completely different grounding schemes that they want because that is > standard in Japan. That's my two cents > > thank you, > > -James Jefferson Jarvis > APRS World, LLC > +1-507-454-2727 > > (apologies for the brevity and spelling...from my phone) > > On Sun, Nov 10, 2024, 11:02 AM Jay via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Can someone/s offer up any solid electrical engineering reason for that? >> >> Makes no sense to me. >> >> Jay >> >> On Nov 10, 2024, at 9:12 AM, david quattro via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >> >> SolArk tech support told us that the PV array ground shouldn’t land on >> the inverter ground bar. But instead should be run to its own local >> electrode. or if you're grid tied it can land on the ground bar at the >> Main AC >> >> >> >> On Sun, Nov 10, 2024 at 6:27 AM Jason Szumlanski via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >>> This is very valuable information. The homeowner sourced these four >>> inverters from someone else before I got involved. Three of the four >>> inverters have a Savant sticker on the front of them. The one without the >>> Savant sticker is NOT the one that is having the problem, but it is >>> adjacent to it. The stickerless inverter is #2 (first slave), but the >>> problem inverter is #3 (second slave). I am assuming the three with the >>> stickers are the same (#1, #3, and #4), but perhaps the one without the >>> sticker has different hardware. I will do a visual inspection the next time >>> I am out there. >>> >>> >>> 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 Sat, Nov 9, 2024 at 4:33 PM Tyrone Houck via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>>> We've noticed a compatability issue with the limitless 15k units and >>>> the newest incarnation of the same(limitless 15k) inverter(additional >>>> circuitry in the wiring compartment associated with the pv inputs is the >>>> one way I'm aware of to tell the difference)..the older units and the newer >>>> units don't seem to play nice with each other though they work fine >>>> independently. The problem we had was one was throwing an arc fault error >>>> and the other parallel faulting in response. The ultimate fix was replacing >>>> the older one with a newer one to match. Not sure if that's what is >>>> happening at your site but after extensive troubleshooting our conclusion >>>> was one inverter was sensing something in the other inverter. May be worth >>>> checking to see if they are all the exact same hardware. >>>> Good luck. >>>> >>>> On Sat, Nov 9, 2024, 8:46 AM Jason Szumlanski via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>>> I agree with that diagnosis. I did a visual inspection of the boards >>>>> and ribbon cables, and everything seems to be okay. It's strange that the >>>>> inverter worked fine in standalone mode. That points to something in the >>>>> paralleling circuitry or software. Getting past Tier 1 tech support can be >>>>> agonizing, but at least I have an established case now. As a customer >>>>> service gesture, I'm prepared to take a new unit off my shelf and fight >>>>> with Sol-Ark later to get this system back up and running as the quad >>>>> setup >>>>> that my customer purchased. This should have been a clear cut RMA by Tier >>>>> 1 >>>>> support in my opinion. >>>>> >>>>> 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 Sat, Nov 9, 2024 at 11:33 AM Jerry Shafer <jerrysgarag...@gmail.com> >>>>> wrote: >>>>> >>>>>> Jason, >>>>>> Everything points to a internal issue maybe with a CT, ribbon >>>>>> connection or just a bad board, regardless a new inverter is the key and >>>>>> solark should really want to investigate the issue themselves anyway. >>>>>> Fun times >>>>>> >>>>>> On Sat, Nov 9, 2024, 7:16 AM Jason Szumlanski via RE-wrenches < >>>>>> re-wrenches@lists.re-wrenches.org> wrote: >>>>>> >>>>>>> I wrote in another thread about an off-grid quad Sol-Ark system that >>>>>>> was shutting down due to parallel stop when one of the four inverters >>>>>>> experienced a DC PV fault, and how that shutdown is far from ideal. The >>>>>>> same system is down once again, this time due to an AC fault code. >>>>>>> >>>>>>> The homeowner started getting repeated F18 and F34 AC overcurrent >>>>>>> faults on one of the slave inverters. This, in turn, shut the entire >>>>>>> system >>>>>>> down due to parallel stop faults (F41). None of the other units had AC >>>>>>> overcurrent faults, and the load is nowhere near requiring all four >>>>>>> inverters for even the most demanding circumstances. It was designed >>>>>>> this >>>>>>> way for redundancy, which I am quickly finding out is not Sol-Ark's >>>>>>> strong >>>>>>> suit. >>>>>>> >>>>>>> To diagnose the issue remotely, I had the owner turn off all four >>>>>>> load breakers, all DC PV input, and the AC microinverter input on the >>>>>>> GEN >>>>>>> terminals. I had them restart everything (several times). Every time, >>>>>>> the >>>>>>> same inverter would have repeated AC overcurrent faults, and the others >>>>>>> would have parallel system faults. Since there were no loads connected >>>>>>> by >>>>>>> virtue of the load breakers being open, I suspected this had to be an >>>>>>> internal fault. >>>>>>> >>>>>>> I went to the site, and Sol-Ark Tier 1 tech support had me shut off >>>>>>> all inverters and take the suspect inverter out of parallel operation >>>>>>> mode. >>>>>>> As a standalone master it was able to power up and support the entire >>>>>>> house >>>>>>> load without issue. Then we reprogrammed it for parallel operation again >>>>>>> and turned everything back on. We were unable to stay on the phone long >>>>>>> enough to determine if this was successful, but ultimately, the fault >>>>>>> returned. I was told to call and ask for Tier 2 next time if it happened >>>>>>> again, which I intend to do on Monday. At this point, the issue can >>>>>>> only be >>>>>>> internal to the unit, and I intend to demand warranty replacement of >>>>>>> suspect components or the whole unit. >>>>>>> >>>>>>> I had to get the system running, so I wanted to take the bad >>>>>>> inverter out of the parallel system. I was hoping that simply shutting >>>>>>> it >>>>>>> down would work. This is the third of 4 inverters in the Modbus chain. >>>>>>> When >>>>>>> turning it off completely (all AC and DC switches disconnected), the 4th >>>>>>> inverter would fault, presumably because the Modbus signal was not being >>>>>>> relayed, but inverters #1 and #2 worked fine. However, I wanted #4 to >>>>>>> also >>>>>>> continue working while taking #3 out of service. So then I turned on the >>>>>>> battery disconnect for #3 but left it in the off mode by not pressing >>>>>>> the >>>>>>> on/off button, thinking that it would allow relay of the Modbus signal >>>>>>> from >>>>>>> #2 to #4. That allowed the system to work momentarily, but then >>>>>>> everything >>>>>>> faulted out due to parallel system stop. In other words, I was going to >>>>>>> have to physically take #3 out of the Modbus daisy chain to make this >>>>>>> work. >>>>>>> >>>>>>> Of course, I didn't have a long enough Cat5 cable with me, nor a >>>>>>> Cat5 splice connector. So I had to rig something, which I did >>>>>>> successfully >>>>>>> to jumper from #2 to #4. But when I turned everything back on, #4 still >>>>>>> would not work. I eventually realized that you have to change the Modbus >>>>>>> address from 04 to 03 in the settings. Apparently, the addresses need >>>>>>> to be >>>>>>> sequential for it to work. Once I did this, I was able to get the >>>>>>> system up >>>>>>> and running again as a triple-inverter parallel setup. No faults were >>>>>>> observed. So the theory was proven that #3 has an issue internally. >>>>>>> >>>>>>> >>>>>>> Anyway, bottom line, I am disappointed at how one inverter fault >>>>>>> takes down the whole paralleled system, and also how taking a faulted >>>>>>> inverter out of the system requires physical and programming changes. >>>>>>> Turning it off should be sufficient. This is a very poor way to >>>>>>> implement a >>>>>>> parallel system that should provide the peace of mind that redundancy >>>>>>> implies. Now I have a customer who thought they were getting a system >>>>>>> with >>>>>>> failsafe redundancy that actually requires a service call every time >>>>>>> one of >>>>>>> the paralleled units decides it does not want to play nicely with >>>>>>> others. >>>>>>> >>>>>>> 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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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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