Solar Alliance Energy has launched a photovoltaic charging station for robotic lawnmowers. The Powershed system allows users to cut the cord and place a robotic mower anywhere the sun shines, the company said. Solar Alliance developed the design in cooperation with a researcher from the University of Tennessee and a provisional patent application has been filed with the US Patent office. The first Powershed unit has been installed at the University of Tennessee and is currently operating. Solar Alliance said the unit is designed to meet demand through a scalable production model and will initially be offered through commercial distribution partners and direct sales.