Solar Radiation Data
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  Solar Radiation Data on Tracked Surfaces
  The following web-based software permits you to hourly solar irradiation values on a surface with two-axis or single-axis tracking. Click here if you need data for fixed surfaces. Please contact us if you need solar energy data for your location.
  Select Location Latitude Tracking Mode Display Results TMY  
Day Kt Daily Radiation (kJ/m2) Hourly Values









1. Graham, V.A. and Hollands, K.G.T. A method to generate hourly solar irradiation, globally. Solar Energy, Vol. 44(6), 333-341, 1990.

2. Graham, V.A., Hollands, K.G.T. and Unny, T.E. A time series model for (the daily atmospheric transmittance) Kt with applications to global synthetic weather generation. Solar Energy, Vol. 40(2), 83-92, 1988.

3. Duffie, J.A. and Beckman, W.A. Solar Energy of Thermal Processes. John Wiley and Sons. New York. 1980.

4. Klucher, T.M.  Evaluation of models to predict insolation on tilted surfaces. Solar Energy, Vol. 23:110-114, 1979.

5. Graham, V.A., Hollands, K.G.T., and Unny, T.E. Stochastic variation of hourly solar radiation over the day.  Proc. of the ISES congress Sep. 1987. Hamburg, Germany. Pergamon Press, 1988

6. Graham, V.A., Hollands, K.G.T., and Unny, T.E. Stochastic modeling of the solar atmospheric transmittance.  Proceedings of ISES congress, 1985, Montreal, Canada.  Pergamon Press. 1986.