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Installation and positioning
100
88
92
112
105
108
South
The diagram above shows solar radiation in percentage
of global radiation in relation to some differently ori-
entated and angled surfaces.
The map shows lines with the same global radiation,
that is the solar radiation measured at horizontal sur-
faces. Source: SMHI.
Using the diagram and the map, one can estimate the
annual value of the solar radiation falling on those
surfaces where the solar panels are located.
100% is the solar radiation falling on a horizontal sur-
face, which in southern Sweden lies between 900 and
1050 kWh/year. The angle of inclined surfaces is 45°.
1. Calculate the annual solar radiation using the map.
The specific solar radiation for the installation is
obtained as a percentage, based on the location
of the solar panel according to the diagram.
2. Multiply the result by the installation's peak output
(3.12, 5.72, 9.36 kW).
3. Multiply the result 2 by a constant 0.9 to calculate
the energy production in kWh/year (with a reser-
vation for shade, dirt and snow coverage).
Example: Visby, 45°, installation south.
1050 x (112/100) x 3.12 x 0.9 = 3302 kWh/year
PV Solar package
800
900
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850
950
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1050
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850
Chapter 3 |
Installation
9
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