I considered the AC voltage but it's a stable 245V or so. Enphase couldn't see anything wrong with AC voltage on their end. I suggested a grid profile change, but they didn't see that as a necessary diagnostic step.
On Mon, Nov 1, 2021, 6:56 PM Dave Tedeyan <[email protected]> wrote: > Hi Jason, > I recently did a microinverter swap of the old D380's to 54 of the IQ7 > 190's. Once it was commissioned I started seeing random MI's drop out, but > not always the same ones. I am pretty sure that this was due to > overvoltage. I measured the line voltage at 255v with the system turned > off. > > Not being my original install, I am not sure if this was an issue before. > I wonder if somehow the IQ series could be more sensitive to overvoltage? > But anyway, try checking voltage... > > Cheers, > Dave > > On Mon, Nov 1, 2021, 6:31 PM Jason Szumlanski < > [email protected]> wrote: > >> We have a site with 34 microinverters at two orientations. It's a couple >> of months old. After about a month a couple of microinverters started >> acting up and dropping power production for no apparent reason, then >> finally started throwing Device Produced No Power issues and totally sopped >> producing but continued communicating. Slowly but surely additional units >> have dropped off. Now a few weeks later we have 24 of the 34 units with the >> same issue. Ten random units are completely fine. These are on various >> branch circuits and both orientations. There is no rhyme or reason to this >> issue that I can see. >> >> I have never seen such a widespread failure on a single site (since the >> M190) and we are not seeing failures of the IQ7A at higher than usual rates >> on any other site. It seems almost impossible that we got a bad batch and >> haven't seen a bunch of failures at at least one more site (it's more than >> a box full of quantity 18 but less than 36). >> >> Enphase Tier 2 tech support was no help at all (many many hours on the >> phone, on hold, etc, no real answers). It was supposedly escalated to a >> higher level, but I never heard back. I finally gave up and just demanded >> that they replace them all. I'm concerned that there is something else >> wrong here and might be wasting my time replacing 2 dozen units. We >> replaced two today and for the last half of the day they seemed to work >> flawlessly, but for how long they will continue to work is anyone's guess. >> >> Needless to say, the client is quite concerned. >> >> If you have had any similar experiences I would love to hear the >> resolution. >> >> >> Jason Szumlanski >> Florida Solar Design Group >> >> _______________________________________________ >> 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 > >
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