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PANEL BEHAVIOUR
INSTANT PRODUCTION
The peak power is given according to standardized test conditions (STC):sunshine of 1000W/m², cell
temperature of 25°C.
In actual use, panel temperature is 45°C (+/-2%), and maximal light power is 850W/m².
Production influence according to irradiance
Ex. 150W solar panel
DAILY PRODUCTION DISTRIBUTION
Solar
production
Gaussian curve (bell curve).
In
winter,
80%
production is made between
11am and 3pm, against 50-
60% in summer with its longer
daylight periods.
It
is
therefore
recommended to avoid any
shadow on your solar panel
during this time slot, in order to
optimize its daily production.
IRRADIANCE COEFFICIENT ACCORDING TO SEASON (NORTH/SOUTH OF FRANCE)
November - February : 0,8 - 1
March - October : 2,5 - 3,5
July - August : 5 - 7
Ex: in July, a 100W solar panel will produce 5 to 7 times its power, meaning 500 to 700W a day.
However, in december in North of France, this same solar panel will produce only 0,8 time its power,
meaning 80W a day.
These values are averages only given as examples for your calculations.
22/49
has
a
of
the
highly
Lille
(North)
Marseille
(South)
Irradiance according to season
For example, a solar panel will have a maximum
instant production of a 80 to 90% of its peak
power in summer, and 40 to 50% in winter.
In Lille, these values would be from 60 to 70% in
summer and from 20 to 30% in winter.
www.uniteck.fr
Winter
Summer
200W/m²
700W/m²
500W/m²
850W/m²
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