One Year Round Robin Testing of Irradiation Sensors - Measurement Results and Analyses

Wotruba, G.; Mayer, Monique N.; Vodermayer, C.; Schulz, B; Glotzbach, Thomas; Schlatterer, M.; Fritze, P.; Zehner, M.

doi:10.4229/24theupvsec2009-4bv.1.64

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“…Figure 2. Ten commercial reference cells under evaluation at NREL.Multiple studies have been done over the years to compare commercial irradiance sensors, including reference cell products, for outdoor use(Zehner et al 2009;Schulz et al 2010;Driesse and Zaaiman 2015). Some observations emphasized in the most recent study at NREL(Driesse, Gotseff, and Sengupta 2022) are :…”

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confidence: 99%

The Baseline Performance Reference for Irradiance in PV System Applications

Driesse,

Habte,

Sengupta

2023

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mentioning

confidence: 99%

The Baseline Performance Reference for Irradiance in PV System Applications

Driesse,

Habte,

Sengupta

2023

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Measuring outdoor I–V characteristics of PV modules and systems

et al. 2022

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The cumulative installed capacity of photovoltaics has passed 1 TW, of which about two-thirds were only installed in the past five years. Many of these new installations incorporate novel module and cell designs that have not yet been subjected to long-term in-field characterization. Indoor accelerated stress testing has historically been a valuable methodology to identify fault mechanisms, estimate degradation rates, and to ensure the safety and normal operation of modules in the field. Still, these methodologies deliver an incomplete image of the exact stress mechanisms that photovoltaic systems are subject to outdoors, which vary with location, time of day, and time of year. In this work we review different outdoor methods to measure current-voltage characteristics of photovoltaic systems, discuss how the environmental conditions impact those characteristics, and examine alternative methodologies for acquiring light and pseudo current-voltage characteristics more applicable to larger scale installations. This review also provides an insight into methods useful for real-time monitoring and degradation analysis at the module and string level.

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