Analysis and comparison of performance of photovoltaic systems from the “Counting the Sun” public awareness campaign on PV performance

摘要: Detailed analysis of 5000 systems that took part in the 2014 measurement campaign “Counting Sun” was performed as besides weekly yield also system descriptions were available. With average energy 33.4 kWh/kWp, and performance ratio 0.74 for all systems, found to be dependent on inverter DC nominal power rated power. For low cost inverters, this 1.16, while high inverters it 0.95. Apparently, expected better does not warrant higher capacity inverter, case inverters. However, due 1-week period, ratio. Also, different components (modules, inverters) do conclusively influence ratios. A longer monitoring period is lower variation these values such statistically relevant differences can observed.