In this paper we present strategies that can potentially improve the accuracy of photovoltaic (PV) simulation models. Generally, output performance levels vary in similar types of photovoltaics. We have categorised different model parameters and highlighted their potential impacts because of the tolerance limits from PV manufacturers. We have focused on the fill factor (FF) to express the characteristics of photovoltaics. Additionally, we have applied our considerations on maximum power tracking (MPPT) techniques such as voltage-based MPPT (VMPPT) and current-based MPPT (CMPPT). Our research suggests the verification of a large sample range of similar photovoltaics for the improvement of PV simulation models.