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Renewable Technologies

Solar

As far as solar power is concerned, the next figure shows the solar radiation for the site making use of the climate data for Eskdalemuir as before:

According to our calculations based on the building plans, a total of 19 BP solar panels (BP3235T) of 220W or Sharp ND-220E1F of 220W or 21 ET-M572185 panels of 185W could be installed in one side of Stell Hill roof.

The next table shows the monthly energy production from BP panels installed on roof. We have calculated it using Merit software and Eskdalemuir climate database considering a SMA inverter. The third column is the monthly energy production according to the PVGIS PV Estimation tool from the European Comission Joint Research Centre.

The difference in the total annual production is because of the different climate database and losses assumed, as the PVGIS Tool assumes 14% losses due to cables, inverter etc. For instance, in Merit we have used the mentioned Eskdalemuir climate database for a typical year (1978), whereas in PVGIS PV Estimation Tool the specific co-ordinates of the site were requested (note that its database was collected within the European Solar Radiation Atlas project and was based on monthly averages of daily sums of global and diffuse irradiation, measured or calculated for european ground meteorological stations for the period 1981-1990). Moreover, it should be mentioned that although the optimum tilt angle has been found to be 38 degrees, we decided to keep it as it was given in the original building plans (37 degrees).

Finally, the following table shows the summary of the three different modules mentioned above as well as a comparison of the cost in order to give you an idea of the costs.