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On-board electricity consumption in the diesel city bus during operation is an important energy source. Electricity isgenerated by a combustion engine-driven alternator. Increased fuel consumption to generate on-board electricity in the bushas a negative impact on the emission of toxic components and carbon dioxide. At the same time, the bus roof surface allowsplacing a set of lightweight photovoltaic panels with power from 1 to 1.5 kW. The article presents an experimental study ofelectricity consumption of a city bus with diesel engine equipped with photovoltaic installation. The stream of electricityconsumed by the bus and generated by a standard alternator and PV system was recorded. Base on the experimental researchcarried out in central Europe; the article analyses the impact of an additional source of electricity in the form of a photovoltaicinstallation on fuel consumption and emissions of toxic components of vehicles located in the latitude of Sydney. In Poland, themaximum global value of horizontal irradiation GHI is 1150 kWh/m², while for Sydney 1652 kWh/m². In addition, the profile oftemperature and sunshine per year is different for these two different latitudes as presented in the article. Electricitygenerated directly from the sun powers the bus's electrical receivers. The photovoltaic system is able to replace 23% of annualelectricity consumption, which at the same time will reduce 4% of fuel consumption and CO₂ reduction. Approximately 25% ofthe light is lost during vehicle traffic in Sydney latitude. The temperature losses of photovoltaic panels are comparable due tothe cooling during vehicle motion. Acknowledgement: The project/research was financed in the framework of the project LublinUniversity of Technology - Regional Excellence Initiative, funded by the Polish Ministry of Science and Higher Education(contract no. 030/RID/2018/19).