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Long-Term Performance of PV Micro-Inverters
S. Krauter, J. Bendfeld
Power Conditioning, Yield, Small Grid-Connected PV Systems, Inverter
Performance, Reliability and Sustainability of Photovoltaic Modules and Balance of System Components
Subtopic: Inverters and Balance of System Components
Event: 33rd European Photovoltaic Solar Energy Conference and Exhibition
Session: 5DV.3.44
1836 - 1840
ISBN: 3-936338-47-7
Paper DOI: 10.4229/EUPVSEC20172017-5DV.3.44
0,00 EUR
Document(s): paper


To compare efficiency and yield of most micro-inverters available on the market during 2014-2017, an in- and outdoor test field at the University of Paderborn have been set up. The inverters have been fed by identical and calibrated crystalline silicon PV modules of 215 Wp. To monitor accurately AC power output and yield, each of the micro-inverters has been equipped with a calibrated precision electricity meter. For micro-inverters requiring control units for grid-feeding that has been acquired also. The test field is equipped with pyranometers in the module plane. The comparison includes energy yield over one to two years and efficiency-load characteristics. The weighted conversion efficiency according to EU and CEC standards has been measured and compiled. After two years of outdoor operation in Paderborn, all efficiency measurements have been repeated: None of the inverters has shown any degradation beyond the measurement accuracy of 0.1% of the precision power meter used (LMG 670 by Zimmer).