I’d bet their sensors aren’t pointed directly at the sun. I guess my point is if the max calculated radiation can be measured then no matter the value, even if .001, then 100% because your seeing the max that can be expected at that time.
Didn’t someone on here have a sensor made of 3 solar cells from a calculator because he was trying to get closer to the angle of the sun during the day? I think 180 solor sensors in an array would smooth out the curve greatly.
–Dave