On the Impact of Partial Shading on PV Output Power

Dezso Sera, Yahia Baghzouz

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Abstract

It is a well-documented fact that partial shading of a photovoltaic array reduces it output power capability. However, the relative amount of such degradation in energy production cannot be determined in a straight forward manner, as it is often not proportional to the shaded area. This paper clarifies the mechanism of partial PV shading on a number of PV cells connected in series and/or parallel with and without bypass diodes. The analysis is presented in simple terms and can be useful to someone who wishes to determine the impact of some shading geometry on a PV system. The analysis is illustrated by measurements on a commercial 70 W panel, and a 14.4 kW PV array.
Original languageEnglish
Title of host publicationProceedings of RES'08
PublisherWSEAS Press
Publication date2008
Publication statusPublished - 2008
EventWSEAS/IASME International Conference on Renewable Energy Sources (RES'08) - Corfu, Greece
Duration: 26 Oct 200828 Oct 2008
Conference number: 2

Conference

ConferenceWSEAS/IASME International Conference on Renewable Energy Sources (RES'08)
Number2
Country/TerritoryGreece
CityCorfu
Period26/10/200828/10/2008

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