asce 7-05 figure 6-18a

huangyhg

asce 7-05 figure 6-18a
i am doing a wind load analysis for a friend on some roof mounted solar panels.  i believe that i have all of the required components figured out except i am not sure how to use table 6-18a.
i am sure that clear wind flow will be used, but how do i determine load case?  also, for the whole solar panel array, do i average cnw and cnl or use worst case?
thank you so much
reference the recent thread about roof top unit wind loadings.