Annex A: Guidance On Module Temperature For Several Locations - CanadianSolar CS3W-PB-AG Installation Manual

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
Figure B.1 – 98th-percentile temperature for an open-rack, or thermally unrestricted
Figure B.2 – 98th-percentile temperature for a close-roof mounted
EN-Rev IM/GN-BM-EN/2.5C1Copyright © January, 2023. CSI Solar Co., Ltd.
module is installed (e.g. mounting distance to rooftop,
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
representative for further information.
 For Open-rack it can be seen how the 70°C are never
exceeded in any of the locations, while for parallel to the
roof mounted modules (not in-roof) this value can be
surpassed for some locations.
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