Solar Resource & Meteorological Assessment Project (SOLRMAP)
Loyola Marymount University, University Hall
Los Angeles, California
Rotating Shadowband Radiometer (RSR)

Latitude: 33.966674o North
Longitude: 118.42282o West
Elevation: 27 meters AMSL
Time Zone: -8.0

*** Notice: The RSR Battery has not been taking a full charge since December 2014, as a result there are large gaps in data each day. Battery was replaced July 9, 2015. DATA SHOULD BE USED WITH CAUTION DURING THE PERIOD WITH BATTERY PROBLEMS ***

Data sets currently available on Loyola Marymount University RSR web site

A rotating shadowband radiometer (RSR) offers a lower cost option of measuring solar radiation resources for renewable energy applications. The RSR uses a silicon-based photodiode pyranometer to measure the global and diffuse solar irradiance. The control and data acquisition system then computes the corresponding direct normal solar irradiance based on the geographic location of the RSR and the time of the data collection events.

By design, the RSRs offer the potential advantages of lower maintenance and calibration costs because they use a single pyranometer with a diffuser for determining the direct, diffuse, and global solar irradiance rather than up to three radiometers with larger optical surfaces, more complex support equipment, or more maintenance-intensive support equipment. Their potential disadvantage is the higher estimated measurement uncertainty because of factors such as the restricted spectral response of the silicon-based detector used in the RSR. Postprocessing software to account for the limited spectral response of the silicon detector has been developed and applied the RSR data. This solar-powered system is simple to operate and provides basic resource information.

For more information about the RSR visit Irradiance, Inc.

For more information about LMU RSR contact: Stephen Wilcox
For more information about this website or the data contact: Afshin Andreas

Any publication based in whole or in part on these data sets should cite the data source as:

Andreas, A., Wilcox, S.; (2012). Solar Resource & Meteorological Assessment Project (SOLRMAP):
Rotating Shadowband Radiometer (RSR); Los Angeles, California (Data); NREL Report No. DA-5500-56502.