I had a similar issue a few years ago. An array would not show several
of the micro inverters. Noise was detected by my phone with the Toolkit.
We added ferrite rings, which did not solve the problem.
Later, for no known reason, the problem went away.
Drake
_Drake Chamberlin_
_Athens Electric LLC_
_Ohio Electrical Contractor's License 44810_
_NABCEP Certified PV Installation Professional_
---
On 2025-09-02 23:28, William Miller via RE-wrenches wrote:
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 [1]
CA Lic. 773985
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------
[1] http://www.millersolar.com/
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