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Costs

Investment costs

Investment costs of building-integrated photovoltaics depend mainly on module costs. The PV generator including mounting accounts for around 70% of total investment costs alone. If special modules are used, the percentage of investment costs is even higher. Investment costs for building-integrated solutions are currently around 20 to 30% higher than roof-mounted systems.
Investment costs are determined by:
  • the type of module used (crystalline or thin-film) and the chosen module structure.
  • the choice of a “standard” or “special” solution for the building-integrated modules. In special solutions, practically every module can differ in terms of size and packing density.
Cost savings are achieved mainly by choosing the amount and type of material (stone, glass, etc.) that can be saved by the BIPV façade or the BIPV roof (details at Cost comparison of façade building materials)

Running costs

The costs of running a PV system are comparatively low. Running costs include, for example,
  • Insurance costs,
  • Maintenance and repair costs,
  • Sink fund.
Energieagentur Nordrhein Westfalen has analysed the total costs of thirty façade-integrated PV systems in operation. The annual maintenance costs only account for an extremely small percentage of around 0.3%.


Figure 1: Cost breakdown of 30 façade-integrated PV systems

Source: Energieagentur NRW 2007

Last page update: 07.02.2011