They can also include wavelengths in the near infrared region (up to 1200 nm). As we can see below, some of the most common solar panel technologies, like monocrystalline and polycrystalline modules, are able to cover a higher range of wavelengths including visible light. However, solar panels can also be designed to absorb light in wider wavelengths. This section of the solar spectrum provides the heat in the Earth and is the radiation spectrum that a solar powered pool heater or a solar pool blanket would use to warm up the pool water in a household.īased on this approach, most solar panel manufacturers focus on maximizing the absorption of light within the visible region. After the 700nm wavelength, there is no longer more visible light but infrared wavelengths. This region contains all the colors of the rainbow and includes wavelengths that go from 400 to 700 nm. The solar radiation spectrum can be divided into several regions according to the wavelengths of the electromagnetic waves that reach the Earth, as you can see in the figure below:įrom the figure above, we can notice that the highest irradiance values can be obtained in the region of visible light. We can describe it as the transference of energy from the Sun through a set of electromagnetic radiations that are distributed in a light spectrum that goes from ultraviolet to infrared radiation. Solar radiation is the main source of energy used by solar panels to generate electricity. Solar Panels Tested Under Artificial Light Conditions.
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