Well this is certainly new information to me. Definitely something to digest and learn.I bought SunPower (E20, not P17 series) after searching the topic. No one questioned their quality, only whether worth the premium.
Various panels have different degradation modes. Backsheets that fall apart are a visible one. Tedlar is a premium backsheet, possibly some others are good.
"Potential Induced Degradation" occurs with some (P-type vs. N-type) silicon panels if negative grounded so all cells higher voltage than grounded frame, other type if positive grounded. Some panels are supposed to be highly resistant, others degrade more rapidly (when dust and water make an electrode across glass surface.) SunPower discovered this when their panels were negative grounded so used a model of SMA inverter which allowed selection of negative or positive grounding. Their newer panels are supposed to be highly resistant. My plan for the future is to positive ground Sunpower, negative ground others.
Most newer inverters including Sunny Boy 7.7 are transformerless, so half the panels will be above ground and half below ground. At least that means half as much voltage. But make sure to select panels highly resistant to "PID"
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