••This research paper deals with design and modeling of a new PV panel model using Proteus software tool.••••This research paper deals with design and modeling of a new PV panel model using Proteus software tool.••The new PV model was created in Proteus tool based on a single-diode circuit.••The performance of the proposed model is tested under arbitrary environmental conditions.••The proposed model has proven to be su. The photovoltaic (PV) panel generates power based on different parameters, including environmental conditions such as solar irradiance, temperature, and internal electrical parameters of the PV panel. Thus, a PV model should be studied in advance to forecast and evaluate the impact of these factors on the PV performance, and this model should be matched with the PV panel's real behavior. For this reason, this paper developed a new model for a PV panel using the Proteus software. A flexible PV model with possibility of varying the weather conditions has been proposed using mathematical equations of a single-diode equivalent circuit, (i.e., photo-generated current, shunt-resistor current, and diode current). Moreover, these equations were modeled using “Pick Devices” in Proteus software. PV modelProteus software toolI–V and P–V curvesArbitrary environmental conditionsI current of PV panel ID Shockley diode current IMPP Current of PV panel at MPP point IO Reverse saturation current of diode IRSH Shunt-resistor current IS Nowadays, photovoltaic (PV) panel-based renewable energy harvesting is one of the most important energy sources that is used globally due to its high availability (Volker, 2005). A PV cell converts solar energy directly into electrical energy by a physical process called the photoelectric effect (Agyekum, 2021). Besides, the PV cell has current-voltage (I–V) characteristics similar to an exponential behavior of a PN junction, which means there is an interface between the two semiconductor material types, namely the P-type and the N-type inside a semiconductor (Adawi, 1964). Since the open-circuit voltage of the PV cell depends on the semiconductor gap and not on the size, there will always be a 0.6 V across an open-circuited cell (Walker, 2001). Therefore, many cells have to be connected in series to form a PV panel w.