Panels sometimes showing lower production (varies)...

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  • desmo907
    Member
    • Mar 2012
    • 65

    Panels sometimes showing lower production (varies)...

    I wrote sbout some issues prior....After ~12 years of running my 21 Phono panels with Enphase micros (M215), 2 of the panels (diodes?) went bad and panels were replaced . It seemed that they were producing 2/3 (if i recall) of the others and someone mentioned 3 diodes in the panel and maybe 1 went bad but you just have to replace the panel and not the diodes. Prior though Enphase had replaced the 2 micros (but the issue was the same and later we determined it was the panels).

    About a year later 1 of the replacement micros started showing lower production numbers and after a few weeks it went dead. Then a month later the other replacement micro started doing the same thing... but a few days after that, the original replacement micro (that was first showing low production and death) is back to normal. Very odd.

    Now it is 2024 and a different panel started showing about 2/3 production of the others... there nothing on the panel, wires under it seems ok, etc. This happend 6/16/24-6/19/24 and NOW it seemed to be back to a full production day (as the panel next to it) on 6/20/24. Today (6/21/24) it seems to be back to 2/3 production.

    Just curious what may cause this... could it be diodes again... the Micros all report normal.

    Thoughts?
  • Will792
    Member
    • Jan 2019
    • 77

    #2
    I hope that your panels are not Suniva (US company in Georgia that went under 6-7 years ago). It had a design defect how diodes were connected to junction box. Failure rates for Suniva panels are very high as a result but the only good news is that it is fixable, if you have soldering skills. You cut open junction box, resolder diodes and use silicone to glue box back to panel.

    Most installers of solar systems provide warranty so it might try to contact your installer.

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    • desmo907
      Member
      • Mar 2012
      • 65

      #3
      My Panels are Phono (Chinese company installed by Ross in CT who then sold off to ConEd who then sold off to RWE).
      I previosly had 2 panels diodes go bad and Phono sent me a PPT deck and tried to blame bird poo, etc. ConEd later replaced the panels with others that did not match as they could not find the Phono anymore. (They saw my original post here and reached out.)

      Turns out my new issue with a different panel seemed to be a "grid profile" issue with the enPhase Micro. Apparenly a software update that was not applied to this particular micro. They pushed it and it seems fine now.. Odd how only 1 of 21 was impacted though.

      Comment

      • Will792
        Member
        • Jan 2019
        • 77

        #4
        I am surprised that grid profile affected solar production. Parameters of a profile affect timing delays in reacting to voltage and frequency deviations from normal levels. Most NE locations use the same Enphase profile, ISO NE 2018. Profile Also includes voltage and frequency levels that trigger microinverter disconnect or production curtailment.

        it might be helpful for you to have installers access to Envoy controller so you can view which profiles are active and see real-time data at panel level. I do not think M215 had firmware upgrade option so nothing to see there.

        i used to have a system with M215s but when system was expanded I replaced all existing inverters with IQ7s and sold m215 on CL.

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