Pyranometer is a scientific instrument that measures the solar insolation that falls on the earth’s surface. In a scenario where a comparison of the solar radiation at different locations is to be made, a solar pyranometer comes in handy.

It measures the global solar irradiance on a planar surface, measured in W/m2.

Global Radiation = direct radiation + diffuse radiation

Direct radiation is the radiation arriving directly from the sun and diffuse radiation is that which is scattered by dust, dirt and clouds.

Pyranometer

The 2 types of pyranometers are:

Thermopile

Photodetector

During the site assessment stage of a solar plant technology, a pyranometer is essential to find the optimal location

It also helps decide the best solar technology that can be employed at place whether it be PV or CSP

To optimise the design of a solar plant, the solar irradiance data is invaluable

It helps evaluate the performance of an operating solar plant, thereby indicating its’ efficiency in producing power and helps understand any associated problems leading to a reduction in performance