That fanned structure is very strong. For a one dimensional example consider an I-beam supported at the center vs having that same I-beam attached only at the edge. Which do you think can support more weight?

And again even at Mars’s 0.38g it’s already bending. It can clearly survive more force, but not at an optional solar collection angle. Use the same thing on the moon near the poles and sure it’s not going to break, but it’s also not collecting 200W/kg.