What what your time vs degradation? I see quite a few solar panels in my area showing up on Facebook Marketplace and other online classifieds that seem to be about 10 years old being sold for a "bigger system". But I'm curious if the real story is that straight forward? Are they significantly degraded? Did the controls or inverters fail, and the owner decided it wasn't worth the hastle? I don't know. The headline price seems attractive, but if they're only putting out 10% of name plate, not worth the effort to install.
It was so significant that one of the 2 strings, 6 panels each, simply shut off especially during peak hours because the inverter's minimal input voltage wasn't met (during peak voltage usually drops due to negative heat coefficient). 1 simply was broken and was bypassed by the.. bypass diodes i guess. And another was at a third. But again, the lower voltage was a much bigger problem than the input.
problem is, you can only measure this very well under load. So taking your multi meter to the place of sale might not say that much. `It might though for the really broken ones.
