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Accurate Determination of Micro-Inverter Performance Using Electrically Biased PV Modules
J.D. Moschner, J. Tant, A. Wabbes, S. Scheerlinck, J. Driesen
Performance, Devices, Characterisation, Characterization, Inverter, Micro Inverter
Photovoltaic Modules and BoS Components
Subtopic: Inverters and Balance of System Components
Event: 37th European Photovoltaic Solar Energy Conference and Exhibition
Session: 4AV.3.4
1175 - 1178
ISBN: 3-936338-73-6
Paper DOI: 10.4229/EUPVSEC20202020-4AV.3.4
0,00 EUR
Document(s): paper, poster


We measured the efficiency of micro-inverters, and found that the simulation of current-voltage curves with digitally controlled power supplies does not work well with some devices, due to the fast perturbation of input impedance that they create. As a workaround, we used PV modules, which were supplied with DC current. The modules have to be selected and parameterized specifically for each desired operating range. Some deviations from the desired operating point are occurring. However, we were able to demonstrate that the same high accuracy can be achieved as with the simulation. The micro-inverters exhibit some peculiar behavior not usually seen in string inverters, in particular deviations from maximum power point (MPP) operation. This requires particular attention in the data analysis in order to assess the MPP tracking efficiency accurately.