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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