Working on it:
https://community.tempest.earth/t/current-conditions/13953/29
I am actually up to 6 different equations I am testing out. I have not had a non-cloudy day in months so I can not fully test myself until that time. I think I have it pretty good in that when there is not a cloud overhead at least one of my equations is fairly close but I can’t be for certain. I also need to trim up the area where it is effective because around 80 degrees Solar Azimuth (20 degrees Solar Elevations) the light sensor on the Tempest does not pick up to much. I can post my functions if anyone would like to test for themselves. Some of them take into account station height and Air Mass of the distance through air between the station and the sunlight entering the atmosphere.
I have the outputs feed back to Home Assistant so I can graph them easier. So I can post better screenshots also. I also run a comparison of ‘expected’ Solar Radiation to measured Solar Radiation from the Tempest; this is what I used currently to determine if actually cloudy. If the expected is twice the measured then it is cloudy; this seems to be working well…but as stated I need a full sunny day to be able to dial in my functions.