The main aim of the project is TO ACQUIRE AND DISSEMINATE PRECISE DATA ON THE PERFORMANCE OF DIFFERENT PHOTOVOLTAIC TECHNOLOGIES UNDER VARYING WORKING CONDITIONS.
The dissemination of results is aimed mainly to support a clear valuation process representing performance figures of PV plants and to support with this data small and medium enterprises active in the photovoltaic sector.
WebGIS shows the SURFACES POTENTIALLY AVAILABLE FOR INSTALLING SOLAR MODULES.
The annual availability of the solar resource on the different roofs has been labeled into 4 intervals: <800, 800-1000, 1000-1200 and >1200 kWh/m² and it is showed by means of different colors none, yellow, orange and red respectively.
Moreover, you can obtain specific information regarding the irradiance and photovoltaic potential just by clicking directly on the roof of the building.
In the map are considered only the roofs of the houses excluding meadows, parking, roads etc…
- RED: surface very well suitable for the installation of photovoltaic modules; annual solar potential higher than 1200 kWh/m²
- ORANGE: surface well suitable for the installation of photovoltaic modules; annual solar potential comprises between 1000 kWh/m² and 1200 kWh/m²
- YELLOW: surface suitable for the installation of photovoltaic modules; annual solar potential comprises between 800 kWh/m² and 1000 kWh/m²
- NO COLOR: surface partially suitable for the installation of photovoltaic modules; annual solar potential lower than 800 kWh/m²
When clicking on a roof a pop-up will appear. The pop-up contains further information that specifically regards the roof:
- roof surface in m²
- yearly average insolation collected by the roof in kWh/m²
- the percentage share of the roof according to the 4 irradiation classes previously defined
- the electricity producible when on the whole surface of the roof are mounted photovoltaic modules based on one of the four following technologies:
> high efficiency crystalline silicon
> standard crystalline silicon
> cadmium telluride (CdTe) or copper-indium materials (CIGS)
> amorphous silicon (a-Si) double junction
(the efficiency used is the efficiency expressed in the data sheet of the manufacturer in November 2011)
Although this application provides a trustworthy assessment of the incoming radiation (see “disclaimer.pdf”), it was developed without any on-site survey and it cannot substitute a complete planning of the photovoltaic system performed by professionals. The calculation does not take into account any little object present on the roof (e.g. chimney) and it also does not take into account potential prohibition of PV installation due to the structural or historical/artistical issues.
This WEBGIS IS A "SOLAR CADASTER", indeed it shows the SOLAR POTENTIAL OF THE ROOFS OF THE CITY OF BRESSANONE. Information are easy-to-access for everyone.
The parameter chosen for labeling the roofs is the annual solar potential, i.e. the solar energy (kWh) that yearly reaches a surfaces of one squared meter.
The first step in the assessment of the solar resource was the realization of a 3D model of the terrain that has been obtained by means of a
By processing these information was obtained a Digital Terrain Model (DTM) having a resolution of 1m and representing all the objects in the considered area.
The calculation were performed considering a standard atmosphere without clouds and aerosols. In order to accounting for the real atmospheric conditions a calibration of the model has been performed by using the 30-years measurements of solar radiation registered in the meteorological station of Laimburg.
The calculation of the ELECTRICITY PRODUCIBLE TROUGH PV-MODULES has been calculated following three steps:
- calculation of the annual average irradiance received by the roof
- calculation of the total irradiance received by the roof as product of average irradiance and total roof surface
- calculation of the electricity yearly producibile on the roof as product of the total irradiance received by the roof and the efficiency of the considered module
The considered efficiency has been found in the datasheet available on-line on the module manufacturer site as at November 2011. The long term degradation of the module has been neglected (the effect on the power is in average around -0.5%/y).
PV PRODUCTION ESTIMATION
To help local PV plant owners understand if the production of their plant is in line with the expectation, it is important to understand what to expect. The PV production depends primarily on the available solar irradiation, tilt and azimuth angles, but also the temperature and the solar cell material are important parameters to estimate the production of a given plant. From the monitored data at the PV test facility, we extracted the production data for the years 2011-2014.
The above tables show the difference in production of a silicon cell PV plant over two consecutive years, relative to the latest year.