Researches of the Impact of the Nominal Power Ratio and Environmental Conditions on the Efficiency of the Photovoltaic System: A Case Study for Poland in Central Europe

Mariusz Sarniak


The paper analyzes a case study of the impact of changing the nominal power ratio (NPR) on the efficiency of a PV (photovoltaic) system located in Poland. In the first stage of the research, the acceptable range of variability for NPR was determined based on simulation calculations, taking into account the parameters of PV modules, inverter, and climatic conditions. The second stage was verification tests for two acceptable extreme cases, carried out based on the analysis of detailed data from the monitoring of PV installations. The results of the verification tests for the two considered periods of operation of the PV system with the change of the NPR coefficient from 82% to 98% resulted in an increase in the annual energy yield by 446.2 kWh. On the other hand, higher relative values of generated energy were obtained only for the months with the lowest insolation in December and in January by 8.2 and 6.04 kWh/kWp, respectively. Higher oversizing of the PV generator (for NPR = 82%) also resulted in an increase by 6.4% in the frequency of operation of the PV inverter in the largest power range (2250–2500 W) and a decrease by 3.7% in the frequency in the lowest power range (0–250 W) for the whole year.
Author Mariusz Sarniak (FCEMP / IMEn)
Mariusz Sarniak,,
- Institute of Mechanical Engineering
Journal seriesSustainability, ISSN 2071-1050
Issue year2020
Publication size in sheets308.1
Keywords in Englishinverter,monitoring data,photovoltaic module,photovoltaic system,photovoltaics
ASJC Classification2105 Renewable Energy, Sustainability and the Environment
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); after publication
sustainability-12-06162.pdf 2.92 MB
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 07-09-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.911; WoS Impact Factor: 2018 = 2.592 (2) - 2018=2.801 (5)
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