INTERNATIONAL JOURNAL of RENEWABLE ENERGY RESEARCH F. Hidayanti et al., Vol.10, No.1, March, 2020 Design of Energy Harvesters on Motorcycle Exhaust using Thermoelectric Generator for Power Supply Electronic Device Fitria Hidayanti*‡, Erna Kusuma Wati*, M. Fathur Miftahudin* *Engineering Physics Department, Faculty of Engineering and Science, Universitas Nasional, Jakarta, Indonesia 12520 (fitriahidayanti@gmail.com, ernakusuma.w@gmail.com, fathurmiftahudin@gmail.com) ‡ Corresponding Author; Fitria Hidayanti, 12520, Tel: +62 8211 1111 7713, Fax: +62 2178 91753, fitriahidayanti@gmail.com Received: xx.xx.xxxx Accepted:xx.xx.xxxx Abstract- One of the excess energies in the environment is motorcycle exhaust gas. Motorcycles with internal combustion engines produce energy waste where around 40% of the fuel energy is wasted in the form of heat energy through the exhaust to the environment. Various research studies to utilize the heat of motorcycle exhaust have been conducted, but the electric voltage generated is still below 5V. Therefore, it is not enough to be used as a power source for electronic devices using Universal Serial Bus (USB). This study aims to design an energy harvesting system using two modules of TEG TE-MOD-10W4V-40 that are organized in series and mounted on a motorcycle exhaust. The design of the device includes the construction of the heat exchanger, the boost converter circuit, and the charger box. The test results show that the maximum electrical voltage is successfully generated in a no-load condition of 4.2V with a temperature difference of 57°C. The design of the device is able to charge electronic devices such as speakers, smartphones, and tablets with an output voltage of 5.2V. The time needed since the motorcycle engine started to reach a constant voltage was 3 minutes. Keywords Energy harvesters, thermoelectric generator, boost converter, Seebeck voltage. . 1. Introduction This transportation sector is a sector that produces substantial heat waste. Data of the Central Statistics Agency in 2017 show that the number of motorcycle ownership in Indonesia has reached more than 113 million units [1]. However, behind the big number of motorcycles, there is a potential for harvesting energy produced by internal combustion engines, where around 40% of fuel energy is wasted in the form of heat energy to the environment [2]. Diverse technologies for utilizing waste heat in motorcycles have been applied, such as a thermoelectric generator (TEG). This technology works based on Seebeck effect. By maintaining temperature differences on both sides, TEG will convert directly from heat energy into electrical energy. The higher temperature difference among two sides, the higher difference in the potential for electricity produced. TEG has some advantages such as environmentally safe, simple, concise, lightweight and noiseless [3]. The disadvantage of TEG is its efficiency, which is still relatively low. However, if the energy source used is heat waste such as in motorcycle exhaust, then efficiency is not a problem anymore. Based on the several studies that have been conducted previously [4-7], the value of the electric voltage generated is still below 5V. Therefore, it is not enough to be used as a