Fremont, Calif.-based Solyndra Inc., a manufacturer of cylindrical photovoltaic (PV) systems for commercial rooftops, has signed a long-term framework agreement with alwitra GmbH & Co. of Trier, Germany, a roofing systems supplier. Under the terms of the agreement, the solar panels will be manufactured at Solyndra’s facilities in Fremont and in Milpitas, Calif. Its thin-film PV systems generate more electricity on an annual basis from typical low-slope commercial rooftops than do conventional flat panel types, according to the company.