NDLI: Temperature and reverse voltage across a partially shaded Si PV cell under hot spot test condition

Content Provider	IEEE Xplore Digital Library
Author	Qi Zhang Qun Li
Copyright Year	2012
Description	Author affiliation: Solaria Corp, Fremont, CA 94555, USA (Qi Zhang; Qun Li)
Abstract	Whether a crystalline Si PV cell in a module would fail in hotspot endurance test under partial shading condition is a practical question to many cell and module manufacturers. Answers to this question are associated with the reverse bias and elevated temperature across a partially shaded cell in a string of a module that is under illumination. This study reveals the reverse bias and temperature. It is found that the temperature has almost a linear relationship with the string length, and the reverse voltage is related to both cell Vpm and string length. The maximum reverse voltage and temperature under given string length and cell Vpm are summarized, which can serve as a pair of criteria to simulate the hot spot test condition to examine individual cell, study its hotspot properties. The elevated temperature can easily reach 130°C, when tested in a 24 cell string that is under short circuit condition during the test. And, the temperature can reach 150°C in a 30 cell string, which may cause permanent damage in module in such a test. Thus, it is cautioned that substantial increase in string length from 24 cells is not a realistic practice.
Starting Page	001344
Ending Page	001347
File Size	776576
Page Count	4
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6317849
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heating Temperature Silicon Photovoltaic cells Leakage current Temperature measurement MONOS devices bypass diode crystalline silicon photovoltaic cell shading hot spot temperature reverse voltage
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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