A solar module is exposed to numerous factors which influence the total yield. Besides the yield being dependent on both the installed technology and placement conditions, some parameters have a direct effect, others have an indirect influence on the actual output. In this study the yield is predicted as a function of both technological and climatic factors. To evaluate the impact of a single parameter, data of a photovoltaic test field with four different technologies and three different test set ups is analyzed to distract an equation for the instantaneous yield of a string of solar modules. An expression is derived to determine the yield based on the ambient temperature instead of the much used panel temperature. This study does not calculate the total yield of the PV system nor does it take into account invertor efficiencies. The yield is calculated at DC side.
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