[RE-wrenches] Strange Enphase IQ7A Failure Issue

[Jason Szumlanski]

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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