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Ruben,
Typically, the lower output from the W-facing array is due to it being warmer in the afternoon in most climates.
Josh
From:
<pvlib-...@googlegroups.com> on behalf of Ruben vZ <r97...@gmail.com>
Date: Friday, May 31, 2024 at 12:21 PM
To: pvlib-python <pvlib-...@googlegroups.com>
Subject: [EXTERNAL] Re: Mixed orientation doesn't result in clearly mixed results
You don't often get email from r97...@gmail.com. Learn why this is important |
Hi Mark, Hi Cliff,
thank you very much for your kind answers. Due to your questions I had a better look on my non-existing transformation of irradiance. I now manually calculate the direct normal, poa direct, poa diffuse and poa global. I guess I did not
understand the meaning of POA before. (I hope now I do :))
Now I get a really nice curve where south (orange) is dominant at noon, east (red) is not dominant but shifted towards the morning and west (blue) is shifted towards the afternoon. I still do not understand why my east facing module yields so much more than
my west facing one. But I will argue with the meteorological input and maybe search for a reason to why the cloudiness could be higher in the afternoon. By the way: @Cliff: if I change the vertical angle from 12° to 60° I get a much clearer view on when the
real energy yield is taking place - thanks for the advice on the shallow tilt!
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HI Ruben,
Are you calculating POA direct and POA diffuse using a transposition model? In your pseudo code below, it appears that these values are from your meteo file, which does not make sense as it is very difficult to directly measure POA direct, you have to calculate it. When you change the azimuth of your array you need to recalculate the POA irradiance.
Josh
From:
<pvlib-...@googlegroups.com> on behalf of Ruben vZ <r97...@gmail.com>
Date: Thursday, May 30, 2024 at 8:26 AM
To: pvlib-python <pvlib-...@googlegroups.com>
Subject: [EXTERNAL] Mixed orientation doesn't result in clearly mixed results
You don't often get email from r97...@gmail.com. Learn why this is important |
Hi alltogether,
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