[RE-wrenches] Enphase Mystery

[drake.chamberlin at redwoodalliance.org]

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
> 
> _______________________________________________
> List sponsored by Redwood Alliance
> 
> Pay optional member dues here: http://re-wrenches.org
> 
> List Address: RE-wrenches at lists.re-wrenches.org
> 
> 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/re-wrenches@lists.re-wrenches.org/
> 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


Links:
------
[1] http://www.millersolar.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20250903/5f59fbd5/attachment.htm>