Abstract Urban Mobility is one of the most critical issues at the present. Public transport in connection with feeder bus system is proposed to be one of the main solution. Chulalongkorn University has a feet of electric feeder bus in operation for a few years now. The feet service is, however, to be improved because of current limitations in battery energy capacity and long battery charging time. This paper aims to examine the total cost of ownership (TCO) of the electric feeder buses using various types of energy storage. The results on the sensitivity analysis highlight the major parameters that exert strong infuence in the TCOs. The fast charging system using supercapacitor battery bus shows the lowest TCO for the present bus feet. The travel distance (km/year) and operational years were illustrated to be the top two parameters that exert major infuence towards the TCO. Introduction Nowadays, air pollution is one of the most critical environment problems in urban area especially Bangkok. Therefore, various technology has been develop to decrease air pollution. An electric vehicle, consequently, is selected to be one of the main solution for the future. Chulalongkorn University has a feet of electric feeder bus in operation for a few years now. The shuttle buses were designed for the real use including a bus specifcation, a charging process and an operating method. To improve service quality, however, there is an analysis needed in several aspects such as consistency feet management [1], a decrease in battery capacity which can be used the total cost of ownership (TCO) for calculating expenses throughout the useful life of the shuttle buses. TCO is widely used for an investment analysis which does not only describe expenses in more detail apart from an overall expense, but also helps reducing unnecessary payments. Furthermore, the calculating process of TCO could be adapted for many different systems; for instance, applying TCO for electric vehicle which consist of various factors namely battery, maintenance process, vehicle insurance, etc. [2, 3, 4, 5, 6]. Input parameters for the TCO analysis are applied sensitivity analysis to identify the most infuencing parameter of TCO and to decrease forecasting error of the parameters [5,6]. In general, the sensitivity analysis can be illustrated in spider plot graph format with percentage deviation representing an impact of TCO towards the changes of each parameter. There are many case studies applying the sensitivity analysis to TCO study. Firstly, the analysis was used to identify palm biodiesel production life cycle costs testing uncertainty in international prices of the end result [7]. Secondly, the sensitivity analysis of marine renewable energy research clearly showed that only a little change in input could cause massive impact on marine renewable energy investment [8]. Apart from the effect of marine energy investment, the analysis also showed the method to reduce an investment cost. Thirdly, the study of electric public bus transport system in Swedish illustrated factors infuencing TCO to compare degree of impacts towards TCO by using Tornado graph [4]. The previous studies show TCO and sensitivity analysis for passenger cars and big size buses in which lack of analysis for medium size buses or feeder buses. In addition, the vehicle energy consumptions were taken from manufacturers or users which the operating conditions are not realistic. This paper aims to analyze TCO of feeder electric bus which are smaller and lighter in comparison with mass transit, as a consequence, it is believed that an energy consumption would be different. Moreover, the collected data for this research is gathered from the shuttle bus currently on service which aids input parameters to be more realistic. In addition, various sources of energy use for electric feed buses are taking into account. For this study, three types of battery are analyzed namely lead acid, lithium-ion and supercapacitor. Sensitivity Analysis of the Total Cost of Ownership for Electric Feeder Bus Using Various Types of Energy Storage 2016-01-1721 TSAE-16IC-1721 Published 03/27/2016 Wachira Nilprapunt and Angkee Sripakagorn Chulalongkorn University CITATION: Nilprapunt, W. and Sripakagorn, A., "Sensitivity Analysis of the Total Cost of Ownership for Electric Feeder Bus Using Various Types of Energy Storage," SAE Technical Paper 2016-01-1721, 2016, doi:10.4271/2016-01-1721. Copyright © 2016 SAE International and Copyright © 2016 TSAE Downloaded from SAE International by Wachira Nilprapunt, Friday, March 25, 2016