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Calculating the solar radiation

  1. Jun 17, 2013 #1
    Hi all

    I am trying to calculate the solar radiation on a PV array that I am studying for. I am using the formulas provided here: http://www.pveducation.org/pvcdrom/properties-of-sunlight/making-use-of-TMY [Broken]
    The module angle (in winter) is 65° and the azimuth angle is fixed 180°, so only the elevation angle is changing. The array is in Michigan (-5 GMT) and I tried using these values to calculate the total radiation, but the values I got for direct beam is negative! I am using NREL data.

    My question is: knowing the direct beam and diffuse radiations, how can we calculate total radiation on a tilted PV module? Sorry it is not my field and I am trying to read and understand the concepts.

    Thank you
    Last edited by a moderator: May 6, 2017
  2. jcsd
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