Every life on the earth is addicted of the sun. The sun is clean and free energy source. In Sweden there is a long term goal for the global energy system with 100% renewable energy. To achieve this goal we need more efforts in a form of including solar cells. Solar cells has existed a long time on the markets, but in the recent years it has been more interesting in the world and it is mainly because the price has gone down, the quality has been better, the efficiency has been higher.

Nowadays people are more interested to do something that is environmentally friendly and profitable. Because of the solar cells are applying good on the roofs and facades so the property companies have been more interested to place solar cells on their buildings.

My project is about potential electricity generation for photovoltaic systems at the new library roof that will be built in Falkenberg. In my work I explain what a solar cell is, how it works, how many types are there and what kind of it is the most common, how solar systems work, how it is installed, what it takes to install solar cells, and what it provides for power.

After I have tested different angles as solar modules are directed against, comparisons and calculations, the results of the design have shown that the roof of the library has good opportunities for mounting solar cells installations. The best angle was 27◦ to the south with azimuth 185◦.

The conclusion of the work is that it is profitable to invest solar systems at the library's roofs. Repayment time is long but it is worth it, in this way Falkenberg’s government also makes an effort for the environment.