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EN-Rev IM/GN-EN/1.0 Copyright © January, 2023. CSI Solar Co., Ltd.
ANNEX A: GUIDANCE ON MODULE TEMPERATURE FOR SEVERAL LOCATIONS
The operational temperature of a PV module changes
during the day and also from day to day throughout the year.
The
98th-percentile
temperature
represents
the
temperature that is larger than 98% of all the temperatures,
and consequently it is met or exceeded only 2% of the time.
The 98th-percentile temperature is to be determined from
measurements taken on hourly-basis, or even more
frequently. For a standard year, the 98th-percentile
temperature would be met or exceeded 175.2 hours.
The operational module temperature is influenced by the
environmental temperature but also by how the module is
installed (e.g. mounting distance to roof, array size, array
spacing and anti-nesting features), as it may allow a more
efficient ventilation. The graphics below from IEC 63126
show this influence, the maps presented here are a general
guidance and assumed conservative, please contact your
local sales representative for further information.
Figure A.2 gives recommended mounting distances to roof
around the world according to IEC committee's
recommendation except for BWh area. If you want to
determine a specific distance on your project located in the
BWh climate area, please contact Canadian Solar’s
technical support. Figure A.3 shows climate area
distribution of the Köppen climate types for the period from
1901 to 2010. For more information about Köppen climate
types, please refer to http://hanschen.org/koppen.
Figure A.1 – 98th-percentile temperature for an open-rack, or thermally unrestricted
Figure A.2 - Mounting distances to roof around the world with which the 98-percentile temperature of cell, T
98
= 70℃
