DNI

DNI, or Direct Normal Irradiance, measures the amount of solar energy received per unit area on a surface that is always held perpendicular (facing) the sun, under clear sky conditions. It is expressed in watts per square meter (W/m²) and is essential for estimating the potential of solar power systems, especially concentrating solar technologies. DNI varies throughout the day and across different locations, influenced by factors like time, weather, and atmospheric conditions. Accurate DNI measurements help optimize solar panel placement and performance forecasting.