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
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