Solar PV Portugal - Renewable energy Algarve - Photovoltaic panels. Photovoltaic panel suppliers in Portugal are acutely aware of the potential what their sun can bring to them. Therefore the PV panels prices Portugal have the lowest prices in years. Photovoltaic energy costs per kilowatt hours is affordable and starting to be lucrative for investors.
The sun is so strong, and gives so much energy that you can use it. As the picture shows, the algarve has a radiation of 1950kWh / m2. Translated, it means a yield of 1950 kW per hour on an area of one square meter. But wait a little while sprinting to your panel supplier. There are some snakes in the grass.
Table of Contents
There is even more influence on the energy delivery of a panel. There is also warmth in this fantastic amount of light. The temperature of the sun plays a mainly negative role in the yield. To clarify this, we need to know more about PV panels. What is the material from which the cells generate this electricity? The quality of the cells and the purity of the material. The colour and the angle to the sun all affect the electric modules.
A photovoltaic cell is a thin plate ('wafer') that usually sawn from a large block of silicon. Silicon is a semiconductor. Silicon thin wires connected to the silicon plate for the transport of the electrical voltage. The cell converts the sunlight into an electric current. More in-depth about the photovoltaic cell working principle, explain construction and working of photovoltaic cells in this article.
Different types of silicon in different types of solar panels. They are differences in efficiency and lifetime, crystalline silicon is of the highest quality. For all the types, the band gap is important.
Widely used and known for its high efficiency and quality. To fabricate monocrystalline panels, the individual crystals are further processing. All crystels are laid in the same direction. That makes a monocrystalline panel generate more energy per surface. The most expensive production method, but it does deliver the highest yield. You can reconise these energy cells by the round corners.
Often used for photovoltaic panels. Due to the difference in production method, the efficiency of polycrystalline silicon is somewhat lower than that of monocrystalline silicon. Individual polycrystalline cells, need no more processing after the solidification process. This makes the production process of a polycrystalline panel shorter and cheaper. You can recognise a Polycrystalline silicon by the right angles, as shown here.
Amorphous exist of powder. The advantage is that it is cheap and that they are flexible. In general, this is not an excellent choice, because the cells deliver a considerably lower efficiency. In the picture opposite, you can see an amorphous cell, recognisable by the uninterrupted blackness of the cell.
Silicon is requir a pure form cells. Fortunately, silicon is available in abundance, including sand, but the purification costs a lot of energy and money. In recent years, technological progress has made it possible to achieve the same return from increasingly impure silicon. It leads to a fall in cost that ultimately results in the selling price.
A photovoltaic panel produces DC voltage from sunlight, in several ways. Depending on the type of panel. Most panels that are being installed in Portugal are crystalline photovoltaic energy panels, but thin-film panels are also installed. There are many different species of this latter type.
Solar pv Portugal - Photovoltaic panels Algarve
Crystalline panels have several cells in series. The cells consist of thin layers of silicon crystals. The layers of crystal are 'doped'. This means that a certain amount of contaminants is applied to the silicon. When light particles (photons) fall on the layer, their electrons shoot them out of their orbit. Photovoltaic cells work because these electrons flow through the material and generate DC voltage.
The current runs from a cell to cell via the electrodes that connect the cells. All cells are in series with each other. Each cell creates a certain voltage (expressed in volts (V)), and together they create the voltage for the entire panel. If the plus and minus sides of the cells connected to each other, you create an electrical circuit. The circuit runs direct current (or DC, 'Direct Current'), which always runs the same way from plus to minus.
To use the free electricity, the direct current (DC) must change to alternating current (AC). The voltage in the network is 230 volts. An inverter will convert the electricity usefull for the national grid and your house. There are also inverters that store the direct DC in battery storage. But to be useful, it has to be transferred to AC at the time you want to make use of it. More about that in the post PV inverter.
The more sunlight falls on the modules the harder they will work and generate electricity. But even in low sunlight, they can already provide some photovoltaic energy. PV panels also provide energy on a cloudy day. Offcours less than on bright days. Since they are often connected in series. The electric flows from one panel to the next, and so all the way to the end of the string.
If there is one panel in the shade, hardly any current letting through. It could affect the yield of the total in the string. To prevent this, there are by-pass diodes in each panel. Which divert the current along the pieces that are in the shade. PV with a micro inverter installed have less of a electricity drop when there is shadow.
More about Monocrystalline vs Polycrystalline