Assuming that CY3 landed somewhere it gets eternal sunlight, I can see how this can be an issue. Many landers and rovers have horizontal solar panels - they would work as long as the sun is reasonably above the horizon. However, the sun is always going to be near the horizon at the poles. That would not only require the solar panel to be mounted vertically, but also be oriented towards the sun somehow.
1. No one has managed to make a landing on the moon's South Pole yet.
2. Since the South Pole doesn't get any sunlight at all, it's believed that there's a possibility of discovering ice/water there.