Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Experimental observations on hot-spots and derived
Year:2015
Research Areas
  • Electronic technology and of the communications
Information
Abstract
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. ? 2015 Elsevier Ltd. All rights reserved.
International
Si
JCR
Si
Title
Solar Energy
ISBN
0927-0248
Impact factor JCR
5,03
Impact info
Datos JCR del año 2013
Volume
118
doi.org/10.1016/j.solener.2015.05.009
Journal number
From page
28
To page
40
Month
MAYO
Ranking
Participants
  • Autor: Rodrigo Moreton Villagra (UPM)
  • Autor: Antonio-P.Eduardo Lorenzo Pigueiras (UPM)
  • Autor: Luis Narvarte Fernandez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)