y meter.</li></ol></div><h2>What Data is Available?<a name="3"></a></h2><p>The process of modeling the performance of a PV system depends on what kind of weather data is available.  Some typical starting points are listed below.  Example scripts using PV_LIB functions have been developed for these various scenarios.</p><div><ul><li><b>Standard Weather Data</b> - (e.g., Typical Meteorological Year)</li></ul></div><div><ol><li>Direct Normal Irradiance (DNI)</li><li>Global Horizontal Irradiance (GHI)</li><li>D