Abstract: The daily product of a photovoltaic panel, depends on geometric condition, season and panel structure. Calculating the product of photovoltaic panels in different geometric conditions and different time domains is very important in constructing a photovoltaic power station. Just like water stored behind a dam and the amount of fuel in a gas power station which are important in producing energy, the amount of peak sun hours in each region and time domain is important in economic decision making. A variety of research is done to find peak sun hours. To design and analyze photovoltaic systems one need to know how much radiation is available. One of the direct methods in peak sun hours calculating is using equations which could calculate the amount of sun radiation. The main target of this paper is correcting the coefficients of sun radiation equations, using practical data, and generalizing the corrected equations to other panel structures.

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