ISO 9901 is an international document that gives recommended practice for the use of pyranometers in solar energy applications (e.g., testing of solar photovoltaic panels, solar thermal collectors or other devices, and performance monitoring of solar energy systems).
ISO 9901 is applicable for both outdoor and indoor use of pyranometers, when measuring plane of array, global horizontal and reflected irradiance, or radiation from a solar simulator.
ISO 9901 on pyranometers of solar energy is applicable to:
Solar energy is a radiation which is produced from the Sun capable of producing heat, causing a chemical reaction, or generating electricity.
Pyranometer is a radiometer device designed for measuring the irradiance on a plane receiver surface which results from the radiant fluxes incident from the hemisphere above within the wavelength range from approximately 0,3 μm to about 3 μm to 4 μm.
ISO 9901 gives you the main application of pyranometer to assess the performance of photovoltaic solar power plants, that is power plants employing photovoltaic solar modules. The reflected irradiance measurement also has become more relevant with the increasing application of bifacial modules.
ISO 9901 provides you the benefits of pyranometers such as designing commercial solar power system, giving insulation requirements for building structures, etc, which helps in manufacturing the pyranometers for solar energy.
PD ISO/TR 9901:2021 supersedes ISO/TR 9901:1990, which is withdrawn.
PD ISO/TR 9901:2021 includes some technical changes with respect to ISO/TR 9901:1990. These are:
ISO/TR 9901