The Zambelli photovoltaic pumping station supplies drinking water to the Lessinia mountain area near Verona. The specific design of this stand alone plant is characterized by direct connection, i.e. without intermediate battery storage, between PV-generator and the variable frequency inverters powering two asynchrone motored piston pumps. Completely automatic operation, including maximum power tracking, is assured by a process controller providing also data monitoring of the system, of which first operating data are presented.