IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
Special Issue Paper
Characteristics and Embodiment of the Practical Use Method of “Monthly Temperature Coefficient” of the Photovoltaic Generation System
Atsushi IgaYoshiyuki Ishihara
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2006 Volume 126 Issue 8 Pages 767-775


We already proposed “monthly temperature coefficient”(1)(2) as the coefficient that indicates the losses caused by the temperature rise, etc., of the photovoltaic generation system (PV system). This coefficient contains non-linear based losses under the low irradiance of the PV system adding to the loss due to the temperature rise of the photovoltaic module. In this paper, we compare “monthly temperature coefficient” and “cell temperature factor”, and discuss the followings:
·The difference in the fundamental view of two coefficients, and two coefficients of the installed 40kW class photovoltaic generation system
·Calculation results and analysis of the photovoltaic module output and temperature coefficient under the typical irradiance and cell temperature of the photovoltaic module
·Simulation calculation results and analysis of two coefficients in the case that the characteristics of the photovoltaic module, location, and support structure of the photovoltaic module are different
Next, the embodiment of practical use method of “monthly temperature coefficient” is described as follows:
(1) The calculation method of annual power generation using the table of “monthly temperature coefficient”
(2)The separation method of losses of the installed photovoltaic generation system using “monthly temperature coefficient”

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© 2006 by the Institute of Electrical Engineers of Japan
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