The authors of [13] examined the power quality at different locations within an academic institution's grid. One of the key findings was that PV inverters generate a total harmonic distortion in the output current ranging from 2.94% to 327.67%. The authors of [14] explored how household PV systems affect voltage quality in a three-phase low-voltage grid. This case study analyzed data collected remotely from two specially designed three-phase Y-connected power meters to evaluate the PV system's impact on the grid. The main finding of this study is that a three-phase PV system in the presence of household loads can create or increase grid unbalance and cause a current in the neutra wire. A simulation model for a microgrid was proposed in [15]. The model was developed in MATLAB/Simulink to investigate power quality when the microgrid operates connected to the conventional grid. In the study of [16], the power factor variation in a grid-connected PV system based on solar irradiance was modeled and analyzed using MATLAB/Simulink. In addition, Reference [17] proposed a detailed mathematical model for the inter-harmonic current in an on-grid PV system, utilizing a transfer function approach. The authors of [18] analyzed the effect of environmental factors on inverter operation, specifically power quality, through simulation. An experimental analysis of the power quality of PV microinverters operating under different operating conditions was conducted in [19]. Moreover, energy efficiency and current distortion measurements of PV inverters together with the associated validation procedures were considered in [20]. The analysis was conducted through a series of experimental laboratory tests on 26 contemporary PV inverters available on the market. In addition to research addressing the causes of output current distortion and quantitative analysis of harmonics generated by PV inverters, extensive research was also conducted on methods for their detection and mitigation [21; 22; 23; 24; 25]. In most studies, PV inverters were tested at a single maximum power point (MPP), typically chosen at the inverter's nominal power. All tests on PV inverters regarding output current distortion found in the literature were carried out under steady-state operation, maintaining constant input power and voltage. The authors of [20] conducted steady-state measurements of the 3 rd, 5 th, 7 th, 9 th, 11 th, and 15 th harmonics across three different input voltages at 25%, 50%, 75%, and 100% of the nominal power. Based on the present review of literature, a need for further research that can include a quantitative analysis of the output current distortion from PV inverters through a broader spectrum (up to the 50 th harmonic) for various input voltages and power levels has been identified. Additionally, there is a lack of research focusing on inverters in unsteady-state operation, specifically analyses of current distortion time evolution during MPPT. Alongside the growing interest in this research area, the increasing number of PV systems connected to the power grid has led to practical issues related to interconnection and interoperability. The IEEE 1547-2018 and IEC 61727:2004 standards address these challenges by specifying requirements that must be met, particularly concerning power quality [26; 27]. These standards prescribe power quality aspects, including DC injection (the presence of a DC component in the output current) and current distortion (the existence of higher harmonics in the output current spectrum). Another critical issue is the performance of PV inverters. One relevant standard that addresses this is the European standard EN 50530:2010 [28], which focuses on the efficiency of PV inverters. This standard outlines procedures for measuring and evaluating the efficiency of PV inverters under various environmental conditions, particularly those connected to the utility grid. To assess efficiency, the starting parameters include the input power (DC) and the inverter's output power (AC).