Performance Analysis of a Grid-Connected Photovoltaic Power Plant: Comparative Evaluation of PVsyst, PVGIS and Actual Field Data

Fatma Yiğit Kaynak

Fatma Yiğit Kaynak, Ali Osman Özkan

Year : 2026
Vol : 5
Issue : 1
Page : 38-52

Accurate calculation of the return on investment periods for solar power plants depends heavily on the reliability of simulations performed prior to installation. In this study, a performance analysis was conducted for an operational 992.25 kWp grid-connected photovoltaic power plant located in Şereflikoçhisar, Ankara, within the Central Anatolia Region, which possesses high solar energy potential. Within the scope of the study, the geographical location of the plant along with the specific characteristics of the photovoltaic modules and inverters used were modeled exactly in simulation environments. The prediction accuracy of PVsyst and PVGIS software was then compared against one year of actual field (SCADA) data. The analysis revealed that the actual annual generation of the plant was 1,528,217 kWh. Under the same meteorological conditions, the PVsyst software predicted 1,458,184 kWh with a negative deviation of 4.6%, while the PVGIS software predicted 1,542,669 kWh with a positive deviation of 0.94%. The findings demonstrate that while PVGIS aligns closely with field data regarding total production estimation, PVsyst serves as an indispensable engineering tool for the detailed analysis of loss parameters such as temperature and soiling. In this context, it is recommended that investors use both software tools for cross-verification during the feasibility phase.

Cite this Article As : Yiğit Kaynak, F., & Özkan, A. O. (2026). Şebekeye bağlı bir fotovoltaik santralin performans analizi: PVsyst, PVGIS ve gerçek saha verilerinin karşılaştırmalı değerlendirmesi. Aerospace Research Letters (ASREL), 5(1), 38-52.

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Performance Analysis of a Grid-Connected Photovoltaic Power Plant: Comparative Evaluation of PVsyst, PVGIS and Actual Field Data, Research Article,
2026, Vol. 5 (1)

Received : 25.12.2025, Accepted : 08.01.2026 , Published Online : 26.06.2026