|９．Energy Payback Time|
Energy Payback Time (EPT) = Eo/Eg
Eo: Energy consumed to manufacture photovoltaic systems
Eg: Annual energy output by photovoltaic systems
Source: PVTEC's "Investigation to Evaluate Photovoltaic Generation"
Report on the investigation commissioned by the New Energy and Industrail Technology Development Organization (NEDO) of Japan during FY1996
Data provided by Sanyo Electric Co., ltd.