pV panel degradation over time-some actual data
pV panel degradation over time-some actual data
(OP)
https://onlinelibrary.wiley.com/doi/full/10.1002/p...
here's the important bit of the abstract (my bold)
Published data on photovoltaic (PV) degradation measurements were aggregated and re‐examined. The subject has seen an increased interest in recent years resulting in more than 11 000 degradation rates in almost 200 studies from 40 different countries. As studies have grown in number and size, we found an impact from sampling bias attributable to size and accuracy. Because of the correlational nature of this study we examined the data in several ways to minimize this bias. We found median degradation for x‐Si technologies in the 0.5–0.6%/year range with the mean in the 0.8–0.9%/year range.
So they had some dreadful panels, dragging the mean down. 0.6%/year gives a drop in output of 12% over 20 years.
here's the important bit of the abstract (my bold)
Published data on photovoltaic (PV) degradation measurements were aggregated and re‐examined. The subject has seen an increased interest in recent years resulting in more than 11 000 degradation rates in almost 200 studies from 40 different countries. As studies have grown in number and size, we found an impact from sampling bias attributable to size and accuracy. Because of the correlational nature of this study we examined the data in several ways to minimize this bias. We found median degradation for x‐Si technologies in the 0.5–0.6%/year range with the mean in the 0.8–0.9%/year range.
So they had some dreadful panels, dragging the mean down. 0.6%/year gives a drop in output of 12% over 20 years.
Cheers
Greg Locock
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RE: pV panel degradation over time-some actual data
RE: pV panel degradation over time-some actual data
Is this an acceptable loss?
B.E.
You are judged not by what you know, but by what you can do.
RE: pV panel degradation over time-some actual data
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: pV panel degradation over time-some actual data
So based on your reply that is an acceptable number. Good to know, not good that they degrade. Based on the KWhour total they have now paid back about a quarter of their cost, and the service life is based on 25 years.
B.E.
You are judged not by what you know, but by what you can do.
RE: pV panel degradation over time-some actual data
Of course for my off-grid house the bliss of not having to run the diesel gennie for 8 months of the year is sufficient in itself.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?