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Data Processing for Photovoltaic Performance Loss Analysis in Nordic Climate Conditions
A. Poskela, L. Karttunen, H. Palonen, H. Huerta, S. Ranta, K. Miettunen
Degradation, Lifetime, PV Module, Modelling
Photovoltaic Modules and BoS Components
Subtopic: PV Module Performance – Modelling, Testing, Standards
Event: 8th World Conference on Photovoltaic Energy Conversion
Session: 3BV.3.17
666 - 669
ISBN: 3-936338-86-8
Paper DOI: 10.4229/WCPEC-82022-3BV.3.17
0,00 EUR
Document(s): paper


The aim of this work is to demonstrate a photovoltaic performance loss analysis workflow for a rooftop system installed in Nordic climate. There is a variety of methods for evaluating the performance loss of a PV system, but they give different results, making comparisons between studies challenging. This study uses several combinations of filters and statistical methods to calculate the performance loss rate, giving values between 1.5 and 3.6 %/year. The range of values is large and steps should be taken to minimise the variance and reach a value that can be compared with other studies. One method to reduce variance in the calculated performance loss rate is to improve data quality, and thus reduce the impact the data filters will have on the analysis. Data quality can be improved by taking great care in the design of the measurement setup and by monitoring the data quality as the measurement is ongoing. Comparability can also be improved during the data analysis by performing it with multiple methods and data filters, as in this work, thus generating a distribution of performance loss rates that can be handled with statistical methods or compared individually with other studies using similar methods.