Photovoltaic or solar panels differ not only in dimensions but also by the active material which generates electricity. In most cases people choose panels made of polycrystalline (or multicrystalline) for their best price-performance ratio. The type of panels is being chosen according to project’s requirements. For example, if the installation space is limited, monocrystalline panels would be the best way to achieve high power but they are more expensive then polycrystalline solar panels.