Total Radiation Unit and Radiation Area

Good evening,
I’m running a simulation to calculate the total radiation on a surface. I got numbers on the legend (ex, 204kwh/m2) at the same time the total radiation is 0.001073. What is the unit for the total radiation here?

Another thing,How can i calculate the area for each amount of radiation (each color area)?


Total Radiation.gh (447.5 KB)