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Resource

Solar Radiation on Collector Manual

from Build It Solar

This is the guideline for running a simple program that provides radiation levels on  solar collectors based on: The collector location (latitude) The collector orientation (azimuth angle and tilt angle) It will provide hour by hour collected energy, or month by month collected energy for full sunshine conditions.

Dowload the program itself from www.builditsolar.com/tools/RadOnCol/radoncol.htm