Solar panels are used to generate electricity from solar radiation. Many people mix solar panels and solar collectors designed to generate heat from solar radiation. Solar panels collect solar radiation and convert it into electricity. They are able to exploit only a part of solar radiation and convert it into electricity.
The efficiency of solar panels is only significant if the object is limited by the roof or another surface where the solar panels are installed so it is necessary to extract as much energy as possible with as little surface as possible, if there is enough room for the installation of more solar panels, efficiency is not so important. For example, a 250W solar panel with an efficiency of 20 percent will be physically smaller than a 250W panel with a 15 percent efficiency but will produce the same amount of electricity.
The extent to which solar panels produce electricity will have the greatest impact on weather conditions. Tropical climates are ideal for solar panels, and they will produce more electricity when exposed to direct sunlight than when it’s cloudy. However, solar panels can be used in all climate zones. Solar panels require direct sunlight when it’s more exposed to direct sunlight, more electricity it will produce.
Another important thing in determining how many solar panels will produce electricity is the length of the day. For example, summers are much longer than in winter. This is actually the main reason why solar panels in winter generate less electricity than in summer, although it’s a common misconception that this is due to heat. Solar panels do not work on heat but solely on solar radiation.
An orientation of solar panels
Ideally, the solar panels should be placed on the south side. On this side, the sun’s light is the longest during the day. If they are located east or west, the utilization is almost twice as low as in the south.
What does it mean when we say that the solar panel has a 250W?
Each solar panel has its maximum power which indicates how much power (W) will produce in ideal conditions. This is called maximum power. The amount of sunlight is different and of course, it varies depending on the period of the day, the season, the weather conditions. For these reasons, solar panels give output power which is less than the maximum output power.