Measurement of the Efficiency of Electric Vehicle Charging Stations

The most important indexes while comparing the performance of the electric vehicles are: 1) the mileage for a single full charge and 2) the efficiency in km/kW.h or t.km/kW.h. As these indexes are deeply interrelated, we assume efficiency is a major specification in most practical cases. The efficiency of the charging stations is a direct multiplier calculating the total efficiency of electric vehicles. Its significant weight and importance draw special attention to measurement methods, measurement conditions and required accuracy in the measurement process to assess the efficiency of electric vehicle charging stations. The paper aims to describe an applied methodology for assessment of Electrical Efficiency of the Charging Stations based on experience with Supercap Rechargeable Energy Storage System (RESS) and provides conclusions valid to all types of RESS.