automated rotating shadowband


The E stands for everything. The SolarSIM-E automated shadowband leverages Spectrafy’s SolarSIM-G to produce highly accurate measurements of global, diffuse and irradiance irradiances (spectral and broadband) and various atmospheric components from a single sensor.

The SolarSIM-E presents a compelling alternative to more expensive tracker- based solutions as the only shadow band to employ an ISO9060 Class A-type pyranometer.

Measurands: Global solar spectral and broadband irradiances, Diffuse solar spectral and broadband irradiances, Direct normal solar spectral and broadband irradiances, Aerosol optical depth, Precipitable water vapor.
Technology: Automated rotating shadow band for the SolarSIM-G.
Highlights: Full range spectra and broadband irradiance for all three irradiance components.

The E stands for everything.

The SolarSIM-E is the most capable rotating shadow band ever developed. The SolarSIM-E leverages the unique design of the SolarSIM-G to be the only shadow band capable of full-range spectral measurement and the only shadow band that employs an ISO9060:2018 Class A-type pyranometer. It presents a compelling option for those looking to measure multiple irradiance components.

The SolarSIM-E automated shadowband leverages the unique design of the SolarSIM-G to produce highly accurate measurements of global, direct and diffuse irradiance from a single, ISO9060 Class A sensor. In addition, the ability to resolve both broadband and spectral irradiance yields unmatched insights for both research and solar resource assessment applications.

A compelling alternative to more expensive, solar tracker-based solutions and more accurate than traditional silicon-based shadowbands, the SolarSIM-E is fully automated and maintenance free.

The SolarSIM-E takes shadowband measurements to a new level of speed and accuracy. By combining the precision of an ISO9060 Class A pyranometer, the fast-response of photodiode measurements, and the insight of spectral correction, the SolarSIM-E provides an unmatched solution for quantifying the solar resource.

The SolarSIM-E can generate a remarkable array of data. Choose from:

Global horizontal irradiance ISO9060:2018 Class A measurements of global horizontal irradiance, covering the complete 280-4000nm solar spectral range.
Diffuse horizontal irradiance With the shadowband automatically deployed, the SolarSIM-E measures diffuse irradiance. Off-axis measurements are used to further enhance the accuracy of the diffuse measurement.
Direct horizontal irradiance The SolarSIM-E automatically calculates the DNI from the measured GHI and DHI.
Global horizontal solar spectral irradiance Solar spectral irradiance over the complete solar spectral range of 280 – 4000nm, with 1nm resolution.
Diffuse horizontal solar spectral irradiance The SolarSIM-E automatically calculates the spectral DNI from the GHI and DHI spectra.
Spectral correction factors for PV Automated calculation of spectral correction factors for up to nine embedded or user-defined solar panels.
Aerosol optical depth Aerosol optical depth values for each wavelength from 280-4000nm.
Precipitable water vapour Total column precipitable water vapor.
Ultra-violet irradiance UV-A, UV-B, UV-T, UV-E and UV index, automatically calculated from the global horizontal spectral irradiance.
Photosynthetically active radiation Total irradiance within the 400-700nm wavelength range, automatically calculated from the global horizontal spectral irradiance.
Sunshine duration Length of time with direct normal irradiance greater than 120 W/m2.
Meteorological parameters Ambient temperature, relative humidity and atmospheric pressure.

The SolarSIM-E comes with powerful software to process and visualize your data.

The SolarSIM-E software sits-offboard the sensor and processes the raw irradiance measurements to generate the various data streams. A Windows-based GUI provides the user with easy visualization of the SolarSIM-E’s data streams.

Multiple options for maximum ease.


Get your SolarSIM-E working straight out of the box with our custom power/comms converter. The Combox allows you to connect to and power a SolarSIM-E directly through a laptop or PC.

Serial over ethernet

The SolarSIM-E can be connected to a networked PC/server via a suitable SoE device. Hardware recommendations are available upon request.


Compatible with SolarSIM-G
Shadowband geometry 5° FOV
Min. measurement interval 20 s
Operating temperature range -30 to 65 °C
Power supply and use 12 VDC, 10 W (2 W stand-by)
Dimensions 420 x 150 x 132 (L x W x H)
Weight 3 kg
Communication RS-485 ASCII, (PC, SoE)
Operating humidity range 0 to 100% RH


Global horizontal solar irradiance, ISO9060:2018 Class A W/m2
Diffuse horizontal solar irradiance W/m2
Direct normal solar irradiance (calc.) W/m2
Global horizontal solar spectral irradiance (280-1200/4000nm) W/m/2nm
Diffuse horizontal solar spectral irradiance (280-1200/4000nm) W/m/2nm
Direct normal solar spectral irradiance (calc.) (280-1200/4000nm) W/m/2nm
Aerosol optical depth
Total column precipitable water vapour mm

The go-to solution for a wide range of applications.

Solar R&D The SolarSIM-E enables complete understanding of all three irradiance components, both spectral and broadband, from a single sensor.
Meteorological networks The SolarSIM-E represents the most cost effective, three-component measurement solution for widespread network deployment. UV and PAR measurements also.
UV Measurement Obtain global, diffuse and direct measurements of UVA/B/T/E and UV Index from a single sensor.
Solar resource assessment The first automated shadowband to employ an ISO9060:2018 Class A sensor, and to provide routine spectral correction. The SolarSIM-E enables practical, bankable spectrally-corrected, three-component irradiance data that minimises performance uncertainty and maximises returns.

How does the SolarSIM-E work?

The SolarSIM-E is an automated shadowband and works in conjunction with the SolarSIM-G spectral irradiance sensor. For each measurement cycle the SolarSIM-E rotates into place to shade the SolarSIM-G, enabling a measurement of shaded, or diffuse, spectral irradiance. In addition, the SolarSIM-E makes off-axis measurements to either side of the sun disc which are used to reduce the error introduced by the use of a band, rather than a ball, to block the sun. At the end of each measurement cycle, the SolarSIM-G makes a measurement of unobstructed global spectral irradiance. Using the global and diffuse measurements, the SolarSIM-E is then able to calculate the direct spectral irradiance, from which the aerosol optical depth and atmospheric precipitable vapour are also extracted.

How accurate is the SolarSIM-E?

The SolarSIM-E leverages the spectral measurement capabilities and Class A performance of the SolarSIM-G to provide remarkably accurate measurements of diffuse and direct broadband and spectral irradiance.

Does Spectrafy sell complete measurement systems?

Yes, we can provide you with a complete turn-key system so you can hit the ground running with your SolarSIM-G measurements.

How does the process of upgrading my SolarSIM-E to add additional measurement functions work?

The SolarSIM-E can be purchased with any or all of its measurement capabilities activated. Additional measurement options can be added at any point in the future via a simple software upgrade. At the same time, users can also choose to have their historical data reprocessed, to include the new measurand(s) from inception.



The Combox is a power and comms converter that allows the user to connect to and power their SolarSIM directly through a PC or laptop.
GV-1 Ventilator

GV-1 Ventilator

The GV-1 ventilator maximizes the reliability and accuracy of SolarSIM-G, SolarSIM-GPV, SolarSIM-UV and SolarSIM-ALB measurements while minimizing maintenance, by reducing the effects of dust, raindrops and dew.