Irradiation is the process by which solar panels are exposed to radiation and moving particles (sun-emitted photons), leading to the process of ionization.
How does sun irradiation affect a photovoltaic cell?
Between Sunrise and Sunset, the Sun radiates good amounts of photons that illuminates the earth and distinguishes day from night. However, the photon from the Sun goes beyond physical light that brightens the day, it gives yield to solar irradiation (sun radiated energy) that causes photovoltaic cells to produce electrical energy.
One of the most important factors to consider when designing a solar photovoltaic (PV) system is the level of solar irradiance at a potential location.
Thus at an equatorial location on a clear day around solar noon, the amount of solar radiation measured is around 1000 watts, that is 1000W/m (or 1.0 kW/m). When dealing with photovoltaic solar panels purely for the generation of solar power, a solar irradiance light level of 1.0 kW/m is known as one “Full Sun”, or commonly “Peak Sun”.
We can only get a fraction of this value inside the earth's atmosphere. The specification of PV modules is done by manufacturers under standard test conditions (STC) i.e., at solar irradiance equals 1000W/m 2. The irradiance of the sun available in a specific location tells how much power a rated solar panel can produce in that location.
Also the effect of Irradiance on the Fill factor is shown in Fig-4. The effect of variation in the solar Irradiance on the P-V characteristics of the cell is shown in Fig-6, it is observed that with the increase in the solar irradiance the cell-voltage and cell-power increases.
What factors should you consider when designing a solar photovoltaic (PV) system?
One of the most important factors to consider when designing a solar photovoltaic (PV) system is the level of solar irradiance at a potential location. In this guide, we look at what solar irradiance is, how is it calculated, and how can you use RatedPower software to simulate and evaluate solar irradiance for your utility-scale PV projects.