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Microinverter PV Systems: New Efficiency Rankings and Formula for Energy Yield Assessment for any PV Panel Size at Different Microinverter Types
S. Krauter, J. Bendfeld
Energy Rating, Yield, System Performance, Microinverter
PV Systems Engineering, Integrated/Applied PV
Subtopic: Power Electronics and Electrical Grid Interface
Event: 8th World Conference on Photovoltaic Energy Conversion
Session: 4EO.2.6
1165 - 1169
ISBN: 3-936338-86-8
Paper DOI: 10.4229/WCPEC-82022-4EO.2.6
0,00 EUR
Document(s): paper, presentation


The market for microinverters is growing, especially in Europe. Driven by rising electricity prices, many small photovoltaic energy systems are being installed. Since 2014, microinverters have been studied indoors and outdoors at Paderborn University. In the indoor lab, conversion efficiencies as a function of load have been measured with high accuracy and ranked according to Euro- & CEC weightings: The latest rankings of 2022 are included in this paper. In the outdoor lab, energy yields have been measured using identical and calibrated crystalline silicon PV modules. Until 2020, measurements were carried out initially with 215Wp modules. Because of increasing module power nowadays, 360 Wp modules are now being used. These extremes have been investigated: An older module with 215 Wp and a new module offering 360 Wp (both with 60 cells). Appling the low-power modules, the challenge for the microinverters was during weak-light conditions, for high-power modules, some inverters temporarily reached their power limits, so output was reduced. A method to determine actual energy yield has been developed, using a linear equation and a reference configuration: So yield for any module & inverter configuration can be determined by just two coefficients.