So, in a provocative curious mood on the eve of Easter w/end I began to wonder about PV panels.
There must be many by now which have been in service for 10 years or more.
How do we think they are doing in comparison to when they were new?
How does, or rather, what is a typical rate in efficiency fall-off over time?
My guess is that many, especially those installed on dwellings with difficult accessible roofs will not have been looked at nor cleaned for at least a decade if they have been in service for that long.
What do we reckon? Would a figure of say 50% or less be an unreasonable estimate of today's efficiency level for a decade old installation?
I wonder if Greta does a PV cleaning round in the same way window cleaners do?
Happy Easter.
