How to calculate the failure rate of photovoltaic inverters

The estimated junction temperature data are used to identify inverter reliability indices and predict the useful lifetime of the inverter system. After developing the models to predict the useful lifetime of the system, the impact of reactive power on the overall reliability of the system is studied.
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About How to calculate the failure rate of photovoltaic inverters

About How to calculate the failure rate of photovoltaic inverters

The estimated junction temperature data are used to identify inverter reliability indices and predict the useful lifetime of the inverter system. After developing the models to predict the useful lifetime of the system, the impact of reactive power on the overall reliability of the system is studied.

The estimated junction temperature data are used to identify inverter reliability indices and predict the useful lifetime of the inverter system. After developing the models to predict the useful lifetime of the system, the impact of reactive power on the overall reliability of the system is studied.

A retrospective investigation has been carried out here of the MTBF of common inverter types. The analysis method used involves calculating the failure rate for all inverter components and summating their individual failure rates to determine the failure rate for the complete inverter.

The paper presents failure rates per PV Site and per kW, considering all portfolio and dividing it regarding five PV plants groups per size, distribution of failures per element, Mean Time.

Determining solar inverter reliablity involves taking a look at the failure rate (including the bathtub curve of failure), the infant mortality rate, the useful life of a solar inverter and the meantime between failure (MTBF).

The purpose of this data collection and analysis is to provide statistical insight into how components fault and fail in a PV system or power plant. This information can be used to inform software such as the PV O&M Cost Model (NREL, 2016), developed by NREL, the SunSpec Alliance (SunSpec) and SNL.

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