Nowadays in laboratories and in industries, distribution in solar cells sizes could be very large, hence, for the first time it is rather difficult to compare photovoltaic parameters which are size dependant (current, serial resistance, shunt resistance,..) and also performances of these cells. Also, it will be useful for scale effect to extrapolate performances calculated on a unit size solar cell to commercial products, especially in the case of heterogeneous wafers used for the device. Methodology In this work, we have focused our model on standard multicrystalline p-type silicon solar cells, the standard solar cell produced by the most industries in 2011. Because of better radiations hardness and of the primer spatial domain applications, p type bulk silicon is the first studied and produced solar cells. [1] We have both used PC1D [2] software and experimental measurement on commercial solar cells in order to extract parameters for our electrical model used with SPICE software [3] (Figure 1). : Open Access Jph D r sh r s J V