Oh, I see. That's for the Dragon capsule. It's in orbit for a much shorter time. I can easily believe that low radiation tolerance is fine there. I wonder if th

Oh, I see. That's for the Dragon capsule. It's in orbit for a much shorter time. I can easily believe that low radiation tolerance is fine there. I wonder if they can use the same cells for a 4 year lifetime. In any case I am confident that they can use some kind of silicon cells at the lower orbits. The ISS uses silicon cells in its solar arrays.