Here is a robotic slope mower ideal for solar farm applications. It has a total of 44 inch cutting width. It is powered by a 19HP Briggs & Stratton Engine and features an electric start system. It is smart enough to perceive its surroundings and avoid obstacles. The below video shows it in action:
The Trex can also take on the sides of highways, hills, and other sloped areas. You can find out more about it here.