- #1
StGoldfinkle
- 3
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Hello, the name's Mike and I'm a newbie here,
I have a question pertaining to solar angles required to calculate a solar panel's hourly generation over one year. Total solar irradiance on a tilted surface equals the sum of the direct, diffuse and reflected component. In my case, reflection is assumed zero and the diffuse and direct horizontal components have been calculated.
The problem is the conversion of the direct horizontal component to its tilted counterpart. For this, I calculate the hourly ratio Rb (cosine of incidence over cosine of zenith). The horizontal component times Rb equals the direct tilted component.
The problem however is that this ratio Rb becomes incredibly large at times due to the zenith angle's cosine being small enough with respect to the corresponding incidence cosine.
This results in an hourly global tilted irradiance (Wh/m2) as such:
Such peaks are just not realistic and I can't seem to find a solution to this problem. This issue occurs nearly every day for all areas. Does anyone have an explanation as to what I'm missing?
Thank you in advance,
Mike
I have a question pertaining to solar angles required to calculate a solar panel's hourly generation over one year. Total solar irradiance on a tilted surface equals the sum of the direct, diffuse and reflected component. In my case, reflection is assumed zero and the diffuse and direct horizontal components have been calculated.
The problem is the conversion of the direct horizontal component to its tilted counterpart. For this, I calculate the hourly ratio Rb (cosine of incidence over cosine of zenith). The horizontal component times Rb equals the direct tilted component.
The problem however is that this ratio Rb becomes incredibly large at times due to the zenith angle's cosine being small enough with respect to the corresponding incidence cosine.
This results in an hourly global tilted irradiance (Wh/m2) as such:
Such peaks are just not realistic and I can't seem to find a solution to this problem. This issue occurs nearly every day for all areas. Does anyone have an explanation as to what I'm missing?
Thank you in advance,
Mike