Is panel production degradation time-based, environmental, or production based?

Is panel production degradation time-based, environmental, or production based?

As solar panels age, production drops by some percent a year.

Is the mechanism for this purely panel age based, based on environmental exposure, based on production, or some blend?

As specific examples, let's say I had the following identical panels:

  • Panel A mounted outside, south facing, with a microinverter doing grid export so everything it could produce, it did produce.
  • Panel B, same place, with a microinverter configured to only put out 50% of peak - so it only produces half of the theoretical output.
  • Panel C, same place, not hooked up at all.
  • Panel D, kept indoors, in storage.

At the end of a period of time (say, 20 years), how will they stack up in terms of maximum output power, and why?

If there are good papers on the mechanisms, feel free to point me to them. I just haven't been able to find the answers to this yet.

submitted by /u/Syonyk
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