Filtering Procedures for Reliable Outdoor Temperature Coefficients in Different Photovoltaic Technologies

Author:

Moser David1,Pichler Markus,Nikolaeva-Dimitrova Miglena2

Affiliation:

1. Institute for Renewable Energy, EURAC Research, Viale Druso 1, Bolzano 31900, Italy e-mail:

2. Institute for Renewable Energy, EURAC Research, Viale Druso 1, Bolzano 31900, Italy

Abstract

Power temperature coefficients δ (TCo) measured indoor at standard test conditions (STC) (as given on products datasheet) always present a negative sign; an increase in temperature leads to a reduced power output. Interestingly, the magnitude of the TCo is not always confirmed outdoor with significant differences between technologies with even change in signs in some cases (e.g., a-Si). It is important to investigate if the reported outdoor behavior is a true effect or if it is the result of a choice of nonhomogeneous sets of data (e.g., either irradiance sensor or modules shaded). In this work, the importance of filtering procedures is discussed in order to work with a reliable set of data and to establish a method that allows comparison with indoor data.

Publisher

ASME International

Subject

Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment

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