The question for me is whether it is worth getting SunPower, REC, QCell used, for the same $/W as new panels of other brands like Gstar, NE Solar sold by Inxeption.
Those are more apples to apples in terms of efficiency (wattage per unit area), so more a question of quality and degradation rate.
I have 18 used 315W Q Cells on my roofs, 9S and 9W. They have to be at least 5 years old probably closer to 10; I have 0 doubts they would perform to rated capacity if angled appropriately.
I have 14 370W NE solar ground mounted and angled appropriately, I've seen them exceed rated power on numerous occasions for a sustained period. I was doubting the data from my "tier 2" AIO so much that I bought a Victron 100/20 and added 2 more NE solar in series aimed slightly SW, they've also exceeded rated capacity multiple times.
Edit to add the Q Cells seem to perform better in cloudy weather but I've attributed that to the shallower angle instead of a better low light efficiency.
The question for me is whether it is worth getting SunPower, REC, QCell used, for the same $/W as new panels of other brands like Gstar, NE Solar sold by Inxeption.
Those are more apples to apples in terms of efficiency (wattage per unit area), so more a question of quality and degradation rate.
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The question for me is whether it is worth getting SunPower, REC, QCell used, for the same $/W as new panels of other brands like Gstar, NE Solar sold by Inxeption.
Those are more apples to apples in terms of efficiency (wattage per unit area), so more a question of quality and degradation rate.