Reliability of Microinverters for Photovoltaic Systems: High-Temperature Accelerated Testing with Fixed and Cyclic Power Stresses

Muhammad Afridi (), Sai Tatapudi, Jack Flicker (), Devarajan Srinivasan and Govindasamy Tamizhmani
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Muhammad Afridi: Photovoltaic Reliability Laboratory, Arizona State University, Mesa, AZ 85212, USA
Sai Tatapudi: Photovoltaic Reliability Laboratory, Arizona State University, Mesa, AZ 85212, USA
Jack Flicker: Sandia National Labs, Albuquerque, NM 87105, USA
Devarajan Srinivasan: Poundra LLC., Tempe, AZ 85281, USA
Govindasamy Tamizhmani: Photovoltaic Reliability Laboratory, Arizona State University, Mesa, AZ 85212, USA

Energies, 2023, vol. 16, issue 18, 1-16

Abstract: This paper presents an extended, accelerated reliability evaluation of forty microinverters, module-level power electronic (MLPE) units for photovoltaic (PV) modules. The forty microinverters were stressed at two static temperatures (65 °C and 75 °C) with two input power profiles (fixed and cyclic power). These power profiles were employed to replicate field-use conditions closely. The accelerated testing was performed for an extended duration (over a period of 15,000 h) to determine the acceleration factor and estimate the service life of microinverters in field-use conditions. Electrical performance and thermal data were continuously monitored during the experiment for all the microinverters. The accelerated stress testing had no failures even after 15,000 h of operation. Using the Arrhenius life-stress model along with average field-measured temperature and military handbook-based analysis, it was estimated that the microinverters should be able to survive for 24–48 years during their service life in field conditions, with a reliability of 74%, having a lower one-sided confidence bound of 95%, obtained using the classical success run approach. Moreover, the lifetime of microinverters was statistically analyzed using a Weibull distribution model. Weibull slope factors were used to estimate a range of characteristic lifetime periods and the reliability of the microinverters with a 95% lower one-sided confidence limit, demonstrating a similar or even exceeding the lifetime of the associated PV modules of 25 years.

Keywords: accelerated lifetime testing (ALT); module-level power electronics (MLPEs); microinverter; Weibull distribution; photovoltaic (PV) systems; reliability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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