The Itaperi campus, at the State University of Ceará (UECE) in Brazil, inaugurated a solar tree made up of ten photovoltaic panels, in order to recharge the batteries of a fleet of 10 electric bicycles. The bikes will be used for campus security initially.
During the day, when the bikes are connected to the tree, the panels recharge the batteries. When using the bicycles, the tree rejects the energy it generates into the public grid, for later use by the UECE, for example to charge the bicycles at night.
You can find similar projects in India or France, with the tree of winds.