In recent years, the competitiveness of solar energy has steadily increased. The people of Estonia are also showing great interest in PV systems, or Photovoltaic systems. The installed capacity increases every year, since at best the payback period for the system at current electricity prices does not even reach ten years.
As with any technology, the solar industry is developing by leaps and bounds, and many people postpone the decision to install solar panels in the belief that prices will fall even more soon, or more powerful panels will appear on the market. Solar energy panels are actually gradually increasing their rated power and becoming more efficient, but we must not forget that the price of any new product is higher. As a rule, this is the best-most not suitable for a customer expecting a quick payback, since the increased performance of a new and more powerful model does not pay the price.
Therefore, for both businesses and individuals, a solar energy system is a smart investment if the system is selected according to the needs. In order to design a system with optimal power, it is necessary to know the energy consumption of the client. Then, you should evaluate the possible installation location and select the appropriate system components.
Often, private clients have the question of which solar energy will fit into the architecture of the house and will not seem like a foreign body on the roof or facade. The good news is that depending on the technology (polycrystal or monocrystal), you can choose the shade of the PV panel and its frame (blue-aluminum or black-dark, or the so-called full-black ). Panels are also available in reddish, greenish and other shades. Often, customers still choose more expensive dark panels that visually look better on the home. For business customers, this is not very important, because if you install them on a large flat roof, then they are not striking.
How quickly does solar energy pay off?
Solar energy produce electricity during daylight hours. The brighter the sunlight, the better the performance. Usually the panel power (Wp or kWp) is chosen so that it is about 20% higher than the power of the inverters (kW). For example, a 10 kW inverter and 48 x 260 Wp (12.48 kWp) panels give very good results. This is because the panel’s peak power is delivered under Standard Test Conditions (STC):
