Home

Irradiance builds instruments that measure sunlight

Rotating Shadowband Radiometers gather data used to predict, benchmark or control solar power systems and to improve solar power system performance through analysis of solar energy resources and development of solar power plant designs.

First developed in 1991, the current generation Rotating Shadowband Radiometer (RSR2) was introduced in 2007. The RSR2 determines global, direct and diffuse irradiance using a single, fast-response, photodiode sensor. The RSR2 provides a robust alternative to installing a set of three traditional laboratory instruments: a sun-tracking pyrheliometer for direct normal irradiance, a horizontal pyranometer with a tracking shade disk for diffuse irradiance, and an unshaded pyranometers for global horizontal irradiance.

Irradiance has manufactured over 600 Rotating Shadowband Radiometers.  They are operating on six continents.  Most are measuring site specific solar energy resources to confirm potential returns-on-investment in large-scale solar power plants and distributed solar power generation. 

Custom solutions for client applications

Irradiance can assist with all aspects of RSR2 customization, installation and operation including adding sensors for additional measurements, custom programming for added sensors, different output data tables,  installation, cellular data services, data retrieval and reporting.