Niudian solar photovoltaic power generation
A photovoltaic system employs solar modules, each comprising a number of solar cells, which generate electrical power. PV installations may be ground-mounted, rooftop-mounted, wall-mounted or floating. In 1989, the German Research Ministry initiated the first ever program to finance PV roofs (2200 roofs). Module performance is generally rated under standard test conditions (STC): of 1,000 , solar of 1. There have been major changes in the underlying costs, industry structure and market prices of solar photovoltaics technology, over the years, and gaining a coherent picture of the shifts occurring across the industry value chain globally is a challenge. The term "photovoltaic" comes from the φῶς (phōs) meaning "light", and from "volt", the unit of electromotive force, the , which in turn comes from the last name of the physicist , inventor of the battery ().
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