Abstract
Detailed analysis of 5000 systems that took part in the 2014 measurement campaign “Counting the
Sun” was performed as besides the weekly yield also system descriptions were available. With average energy yield
of 33.4 kWh/kWp, and average performance ratio of 0.74 for all systems, performance ratio was found to be
dependent on the ratio of inverter DC nominal power and system DC rated power. For low cost inverters, this ratio
was 1.16, while for high cost inverters it was 0.95. Apparently, expected better performance does not warrant higher
capacity inverter, in the case of high cost inverters. However, due to the 1-week period, performance ratio was found
not to be dependent on this ratio. Also, different components (modules, inverters) do not conclusively influence
performance ratios. A longer monitoring period is expected to lower variation of these values such that statistically
relevant differences can be observed.
Sun” was performed as besides the weekly yield also system descriptions were available. With average energy yield
of 33.4 kWh/kWp, and average performance ratio of 0.74 for all systems, performance ratio was found to be
dependent on the ratio of inverter DC nominal power and system DC rated power. For low cost inverters, this ratio
was 1.16, while for high cost inverters it was 0.95. Apparently, expected better performance does not warrant higher
capacity inverter, in the case of high cost inverters. However, due to the 1-week period, performance ratio was found
not to be dependent on this ratio. Also, different components (modules, inverters) do not conclusively influence
performance ratios. A longer monitoring period is expected to lower variation of these values such that statistically
relevant differences can be observed.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 31st European Photovoltaic Solar Energy Conference |
| Publisher | WIP Wirtschaft und Infrastruktur GmbH & Co. Planungs-KG |
| Pages | 2237-2240 |
| ISBN (Print) | 978-1-5108-2013-5 |
| Publication status | Published - 2015 |
| Event | 31st European Photovoltaic Solar Energy Conference - Hamburg, Germany Duration: 1 Sept 2015 → … |
Conference
| Conference | 31st European Photovoltaic Solar Energy Conference |
|---|---|
| Country/Territory | Germany |
| City | Hamburg |
| Period | 1/09/15 → … |
Keywords
- PV performance
- inverter to system power ratio
- cost
- performance ratio
- valorisation
