The Solar Spectral Irradiance Meters (SSIM) calibrated at NREL

Viktar Tatsiankou, PhD Student in Electrical Engineering, has successfully deployed the Solar Spectral Irradiance Meters (SSIM) at National Renewable Energy Laboratory (NREL) during November 15-22 trip to Golden, Colorado. Viktar, working closely with NREL's senior scientist Keith Emery, was able to compare the performance of two next generation SSIMs from COFOVO Energy against the state-of-the-art spectroradiometers, the pyrheliometers and the absolute cavity radiometer. The SSIMs were able to match aforementioned instruments with a great accuracy, the example of which is demonstrated in the figure below, where the SSIM's direct normal irradiance is within 0.5% of the Kipp and Zonen's model CH1 pyrheliometer.