There existed already previously surveys on our Sonnenertrag.de-Homepage, which our visitors very liked. Because of that reason did we want to revive this tradition and offer now regularly surveys. The topics for the surveys should come from the field of renewable energies with the focus on photovoltaic. Clearly will we also have surveys which concern only Solar-yield. We especially would like to realize the ideas and suggestions of our user which conduct the surveys. This poll is a further step to integrate all our users better into the community.