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Photovoltaic Solar Energy
 

Harness the sun's energy
Iberdrola Photovoltaic Solar Energy for your home

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Offer, Financial aspects ...

Offer: The sun is an inexhaustible source of energy. make the most of it with iberdrola!

Make the most of renewable energy sources and find out about all the benefits of Photovoltaic Solar Energy. Iberdrola gives you advice so you can make the most of your investment from the outset, and we help you process the permits and authorisations needed for building and starting up the installation.

Iberdrola's Photovoltaic Solar Energy installations offer you:

  • The guarantee and experience of the IBERDROLA Group.
  • Installations of any size.
  • An analysis of the most suitable type of installation in each case.
  • Installations with a fixed structure or with tracking, on the roof or any plot of land.

Financial aspects: ALL THE INFORMATION ABOUT PHOTOVOLTAIC INSTALLATIONS

  1. Financial aspects: Cost of a solar installation

    The cost of a solar installation will depend on various factors such as the power, the type of installation, the quality of the equipment to be used, whether it is monitored, whether civil engineering work is needed, etc. There could also be other costs associated with connecting the photovoltaic installation to the grid, such as the power transmission line or the construction of a transformer station in the case of a medium-voltage connection point.

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  2. Financial aspects: Subsidies

    In some autonomous regions in Spain, the installations for harnessing solar energy can benefit from subsidies.

    For more information you need to contact the body in your region that manages these subsidies.

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  3. Financial aspects: Taxation

    There are various tax benefits with some Public Administrations. For further information on the benefits currently in force, please consult the different administrations involved.

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  4. Financial aspects: Maintenance

    In order to obtain an appropriate and constant level of energy production over time, regular maintenance of the installation is recommended. Its cost will depend on several factors, including the type of installation (fixed or with tracking), power, etc.

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  5. Financial aspects: Insurance

    It is advisable to insure the photovoltaic installation against theft and vandalism, and also to take out third-party liability insurance (in some cases, the latter is included in the home insurance policy). The cost of the insurance will depend on various factors such as the installation's power, the location, whether surveillance measures are in place, etc.

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  6. Financial aspects: Management of technical and administrative documentation

    The construction and start-up of a photovoltaic installation requires the preparation of a number of technical and administrative documents, as well as the processing of certain authorisations.

    The administrative procedures may vary depending on the intended installation type and its location. To find out exactly about the procedures for each case, we recommend contacting the various administrations and, if the installation connects to the grid, the electricity distribution company in the area where the installation will be located.

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Technical Aspects: TECHNICAL DETAILS OF PHOTOVOLTAIC INSTALLATIONS

There are two types of photovoltaic solar installations, depending on their geographical location and utility:

  1. On an island, i.e. not connected to the grid, whose utility lies in the self-generation of electric power for own consumption. These installations are typically used to power mobile telephony repeaters located on mountains, or in country houses not served by the distribution grid.
  2. Connected to the distribution grid, in which case the produced energy is fed into the electric distribution grid and subject to financial compensation.

 

There are two types depending on the type of structure they use.

  1. Fixed: These are always facing the same direction and can be located on building roofs or on the ground. If they are installed on a roof, they can be laid out as a rack (with a structure seeking to obtain an optimal gradient relative to the horizontal plane in order to capture maximum radiation), or be architecturally integrated on the roof (parallel to the roof's gradient).
  2. With solar trackers: Their position varies depending on the sun's location. Because of the characteristics of the structure it needs, this type of installation is located on the ground.


The main components of a grid-connected photovoltaic installation are as follows:

  • Photovoltaic panels
    These consist of solar cells capable of turning solar radiation into DC electricity. The unit used to measure their power is kWp. Depending on the source material type, the panels could be made of silicon (monocrystalline, polycrystalline, amorphous or a any combination thereof) or other materials such as copper-indium diselenide (CIS) or cadmium telluride (CdTe).
    Whatever the type chosen, it is very important to select top-notch manufacturers to ensure effective warranty coverage.
  • Inverters
    These turn the DC current generated by the photovoltaic panels into AC current with the same characteristics as the grid.
    They operate automatically:
    • When the panels begin to generate sufficient power (approximately 10% of the maximum power) the installation starts generating energy.
    • When solar radiation is insufficient or when full power is unnecessary, the energy feed is disconnected or reduced.
    • If facilities connected to the grid undergo supply interruptions (for example, due to maintenance work on the installation), electric power is cut off instantly to prevent risks to the operators.
      The inverters must be installed in a cool place, as otherwise their performance and useful life can be reduced significantly.
  • Supporting structure
    Photovoltaic panels are usually fitted on a purpose-built structure, either adapted to slanted roofs or designed for flat surfaces.
    The material must provide high structural strength and be capable of withstanding the elements, and the structure is usually made of aluminium or hot-dip galvanised steel.
  • Electrical installation
    The electrical installation must guarantee the safety of people and of the installation.
  • Metering equipment
    The photovoltaic facilities must incorporate the required energy meters for measuring the produced and consumed energy.

 Other technical aspects to take into account:

  1. Guidelines for placing the solar panels in the Iberian Peninsula.
    In fixed solar installations, in order to optimise the energy and financial results, the following solar panel placement guidelines should be followed:
    • Position: facing south, although 20º variations east or west are allowed.
    • Gradient relative to the horizontal plane: between 30º and 40º.
    • No obstacles that can cast shade.
  2. By way of guidance, the required surface area depending on the type of installation is:
    • Fixed installations architecturally integrated on roofs: 8-10 m2/kW.
    • Fixed installations on a horizontal surface: 20-25 m2/kW.
    • Installations with solar trackers: 50-60 m2/kW.

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