Total radiation

Good afternoon,
I’m trying to calculate total radiation using ladybug. I multiplied the radiation result by the surface area of the geometry but I didn’t get the same number as in the total radiation. can anyone please tell me how to fix that?
panel total (409.3 KB)

A. Find area of each mesh face (Please search on McNeel forum)
B. Multiply area with radiaton results
C. Sum = (A * B)

Hi @Eiman.g, as also suggested by @devang, this is a way to do so. I get a difference of just two units.

Here’s the file:
panel total (416.1 KB)

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Thank you i appreciated