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Electric vehicles are a fresh trend in the Indonesian automotive world. The role of electric vehicles is supportive of maintaining the earth from air pollution. Electric vehicles use batteries to store the energy required. To preserve the condition of the battery, a good battery management system is needed that can protect the battery from overcharging, overuse, and even excessive surges due to backflow from an electric motor. The battery management system is designed using Arduino-Uno as a controller and processor using the ACS71230A current sensor module which is capable of measuring currents up to 30A. Using the waterproof sensor DS18B20 module to measure temperature. Apply a voltage divider circuit to measure the voltage on a battery because of an analog input voltage. Testing is done by examining the entire module and looking for the accuracy of the calculation of each module. To evaluate the level of accuracy is done by comparing the data that is read using Arduino and data measured using a multimeter. In designing this system, the final results of a battery charging management system can evaluate with an accuracy rate of current calculation far better than the accuracy rate of voltage calculation and an accuracy rate of 97% temperature calculation. The measurement of battery capacity is calculated based on the final power that can be achieved by the battery by calculating the multiplication between current and voltage. This battery charging management system can also display information using a serial monitor on the Arduino IDE when connected to a computer.

Petroleum is a limited natural resource and if used continuously will experience scarcity and increase in price. KMHE is one of the efforts of Indonesia’s government in advancing the technology of electric vehicles and fuel vehicles in terms of more efficient use of energy. The prototype of the SEM electric car is an electric car made by UNTAR Engineering students that will be included in the upcoming KMHE. The prototype of the SEM electric car uses a BLDC motor as a drive. The BLDC motor is controlled by an electronic controller. Therefore, the BLDC motor controller simulation was designed which can be used as a reference in designing BLDC motor controllers that will be used in KMHE 2020. From the simulation results, the maximum speed of the BLDC motor is obtained by using a controller designed at 2680 rpm. The speed of an electric car of 40 km/h can be achieved by adding a proper transmission system from an electric motor to the car wheel.