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How do we think they are doing now?

whjohnson
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.
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  • 0
    My experience is the same - no obvious decline in output at all (if anything the recent trend has been upward) -


    Figures for my 2.14kWp system are:

    2012 1785kWh

    2013 1822

    2014 1743

    2015 1841

    2016 1778

    2017 1821

    2018 1908

    2019 1905

    2020 1897

     and likewise my panels only ever get cleaned by rain and the snow sliding off them.

      - Andy.


    It's good to know that someone else keeps meticulous records.  My system is 3.4kWp, but half faces south east and the other half south west.  The result is a reduced peak output but for longer through the day.


    David
Reply
  • 0
    My experience is the same - no obvious decline in output at all (if anything the recent trend has been upward) -


    Figures for my 2.14kWp system are:

    2012 1785kWh

    2013 1822

    2014 1743

    2015 1841

    2016 1778

    2017 1821

    2018 1908

    2019 1905

    2020 1897

     and likewise my panels only ever get cleaned by rain and the snow sliding off them.

      - Andy.


    It's good to know that someone else keeps meticulous records.  My system is 3.4kWp, but half faces south east and the other half south west.  The result is a reduced peak output but for longer through the day.


    David
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