Photovoltaic installations can vary significantly in their performance. Factors such as orientation and angle of installation can have impacts. Total solar radiation has a significant impact on energy production from a photovoltaic array as does temperature. A final performance parameter is financial; as energy prices continue to rise, the return-on-investment periods for photovoltaic installations continues to fall. This talk will present quantitative performance parameters for a 4.4 kW photovoltaic array that went on-line in September 2005. Daily output, along with comparisons to a net radiometer will be presented along with performance comparing orientation, solar tracking, and comparison with modeled output.