12 December 2019 5 10K Report

I'd like to get hourly solar data to generate TMY for local place. But I have a problem with the data. As we know that Solar data have the relationship with:

Solar Global Horizontal (GHI) = Direct Normal (DNI) X cos(θ) + Diffuse Horizontal (DHI)

But when I put the data in Elements (a tool for generating EPW weather file), I found the data I got do not match that.

For the GHI and DHI, I chose the fixed mounting type, slope and azimuth were set to 0.

For the DNI, I chose the Two-axis mounting type.

Could anyone answer my doubt? Thank you.

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