Experimental observations on hot-spots and derived

Moreton Villagra, Rodrigo; Lorenzo Pigueiras, Eduardo y Narvarte Fernández, Luis (2015). Experimental observations on hot-spots and derived. "Solar Energy", v. 118 ; pp. 28-40. ISSN 0927-0248. https://doi.org/10.1016/j.solener.2015.05.009.


Título: Experimental observations on hot-spots and derived
  • Moreton Villagra, Rodrigo
  • Lorenzo Pigueiras, Eduardo
  • Narvarte Fernández, Luis
Tipo de Documento: Artículo
Título de Revista/Publicación: Solar Energy
Fecha: Agosto 2015
Volumen: 118
Palabras Clave Informales: Hot-spot; PV module lifetime; PV module efficiency; Operation losses
Escuela: Instituto de Energía Solar (IES) (UPM)
Departamento: Electrónica Física
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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The hot-spot phenomenon is a relatively frequent problem occurring in current photovoltaic generators. It entails both a risk for the photovoltaic module’s lifetime and a decrease in its operational efficiency. Nevertheless, there is still a lack of widely accepted procedures for dealing with them in practice. This paper presents the IES–UPM observations on 200 affected photovoltaic modules. Visual and infrared inspection, as well as electroluminescence, peak power rating and operating voltage tests have been carried out. Thermography under steady state conditions and photovoltaic module operating voltage, both at normal photovoltaic system operating conditions, are the selected methods to deal in practice with hot-spots. The temperature difference between the hot-spot and its surroundings, and the operating voltage differences between affected and non-affected photovoltaic modules are the base for establishing defective criteria, at the lights of both lifetime and operating efficiency considerations. Hot-spots temperature gradients larger than 20 °C, in any case, and larger than 10 °C when, at the same time, voltage operating losses are larger than the allowable power losses fixed at the photovoltaic module warranties, are proposed as rejecting conditions for routine inspections under contractual frameworks. The upper threshold of 20 °C is deduced for temperate climates from the basic criterion of keeping absolute hot-spot temperatures below 20 °C.

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ID de Registro: 36395
Identificador DC: http://oa.upm.es/36395/
Identificador OAI: oai:oa.upm.es:36395
Identificador DOI: 10.1016/j.solener.2015.05.009
URL Oficial: http://www.sciencedirect.com/science/article/pii/S0038092X15002327
Depositado por: Memoria Investigacion
Depositado el: 02 Dic 2015 19:00
Ultima Modificación: 01 Sep 2017 22:30
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