See the map of Sweden as example to figure out how many kilowatt-hours your prospective solar plant can produce or contact our experts and they will help you.

The figure shows solar radiation as a percentage of the global radiation against some different oriented and inclined surfaces. The map shows lines with the same global irradiance, i.e. the solar irradiance measured against horizontal surfaces. When the solar panels are placed against a horizontal surface, they provide 100% solar radiation. The angle of inclined surfaces is 45°.

Work out the annual insolation using the map. Depending on the location of the solar panel as shown in the figure, plant-specific solar radiation is obtained as a percentage.

Multiply the result by the plant's peak power (eg 4 / 8 / 12 / 16 / 20)

Multiply result 2 by a constant 0.9 to calculate the energy production in kWh/year (allowing for shading, soiling and snow cover).

Example:

Stockholm, 8 kW, 45°, mounting south (112%)

1000 x (112/100) x 8 x 0.9 = 8064 kWh/year