Solar Radiation Data
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  Solar Radiation Data on a Fixed Surface
  The following web-based software permits you to generate daily and hourly solar irradiation values on a horizontal surface or a surface tilted to the equator. Click here if you need data for systems with two-axis or single-axis tracking. Please Contact us if you need solar energy data for your location or assistance with the design of solar energy conversion systems.
  Select Location Latitude Tilt Angle Display Results TMY  
  Deg Deg     
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.