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Photo voltaic (PV) panels are now mainly used on separate houses, or in larger industrial installations. The EU is now taking steps to implement its binding target to reduce climate gas emissions by at least 40% by 2030, and increase the use of renewable energy to 27% of total consumption by the same date . The projected share of renewable energy in the gross final energy consumption was 15.3% in 2014 . Consequently, as significant increase in renewable energy production and consumption is necessary. However, almost 3/4 of the European population lived in urban areas in 2015 , and solar energy has been inaccessible to most cities’ citizens living in flats in residential condominiums. In order to increase the use of solar energy, also people living in flats in cities need to have a solar panel on their roof top.