Question-and-Answer Resource for the Building Energy Modeling Community
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Hi! I had the same problem and I solved in the following way.
In Auxiliary Program documentation (https://energyplus.net/assets/nrel_custom/pdfs/pdfs_v22.1.0/AuxiliaryPrograms.pdf) part 2.5.9 Custom File Processing - Solar Radiation Value Calculation tell you:
"[...] many data sources have only Global Horizontal (sometimes called Total) or none of the solar radiation elements. When global radiation is available, then a different model (Perez Model) is used to split the global into direct normal and diffuse horizontal values.[...] In custom weather file processing does the following: [...]
[...]"
However, you need to privide the data of Global Horizontal Radiation and indicate that you don't have other data of radiation (the normal and diffuse horizontal radiation). And in order to indicate to EnergyPlus that you don't have these, data you need to read the part 2.9.1 Data Field Descriptions. Particulary, parts 2.9.1.15 and 2.9.1.16, where the documentation says "use 9999 for missing data" for these two.
With this in mind, you replace the information in your WeatherFile of solar radiation and automaticaly EnergyPlus will do the calculations of Perez model when you run the simulation.
My custom WeatherFile to use only Global Horizontal Radiation was as in the attached file.
Sorry for my english, I hope it help to all you. Best!
