[RE-wrenches] Enphase Mystery

[William Miller]

Friends:



I have a project where I installed 36 IQ7 inverters a few years ago and
then another 12 on a different building about 2 years ago



On June 6 of this year a few of the 12 micro-inverters stopped producing.
Over the course of the next 30 days the rest of the 12 stopped producing.
When I checked on them the 12 were not communicating with the Envoy.



I went on site and found the power to the string had been on and off
intermittently due to a bad relay we have in the circuit.  I bypassed the
relay and the micros would still not produce or communicate.



I called Enphase and they said there was noise on the power system that was
causing the problem.  I pondered this for a while and figured the micros
should not stop producing if the communications went down.  I called
Enphase back twice and they could not offer a solution.  I tried again
today and the tech was able to determine there was a setting that when
changed allowed communications.  He also said there was a low DC resistance
that indicates an arc fault.  He was able to correct both issues and the 12
are now communicating and producing.



The problem is over so I don’t want to put a lot of thought into this but
my curiosity won’t let me stop thinking about this issue.  I feel compelled
to write to the list because if anyone experiences this problem they might
benefit from what I learned.



Have any of you experienced this?



William Miller



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985
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