How the ideal rooftop needs to be
In principle photovoltaic systems can be installed anywhere that receives adequate sunlight. A facility facing the south with an incline of approximately 30% offers the best energy yield. Deviations towards the south west or south east or deviations in the incline between 20° and 50° marginally reduce the energy yield. Shade cast by trees or neighbouring buildings, among other things, should be avoided since they can drastically reduce the energy yield.
Please observe whether the roof is shaded in the fall or spring. it is important that no shade falls on the planned area of the facility during summer, when the sun has reached its topmost position. Shade during the winter months only plays a minor role since only a small portion of the annual yield is produced during this season.
We strongly recommend that you do not choose the size of your photovoltaic solar power system based on your own consumption of electricity. Due to the remuneration of the solar generated electricity by the network operator - regulated by different laws most countries - it is recommended that the size of the facility be assessed on the basis of the available roof area and the financial means at one’s disposal in order to achieve the best possible return on one’s investment.
A four person household consumes approximately 3,500 to 4,000 kWh electricity per annum. A facility with 1 kWp (required roof area approximately 8 mË›) with the roof facing south and an incline of between 30-45° generates approximately 800-1000 kWh of electrical energy annually. In other words, a 4 kWp facility (approx. 32 mË›) generates as an annual mean the total yearly consumption of electricity for an average four person household.
A solar power system is always profitable. Every generated kilowatt hour saves us approximately 0.7 kg CO2 and thus actively contributes towards the protection of the environment. It is quiet, non-intrusive and above all clean. It considerably increases the value of the house and pays for itself.
