Ladybug Radiation Analysis on rotating surface

Hello!

I am trying to make a Radiation Analysis of a surface which orientates normal to the sun vectors, trying to get the highest amount of radiation. I managed to orientate the surface in the right way, but i think for the radiation ladybug combines the surfaces and calculates them as one object. How do I tell grasshopper to take one surface for one hour?

I just realised there also must be another problem, because when calculating for one hour the orientated surface gets less radiation than a horizontal one. Please help!

Matthias