DEVELOPMENT OF PHOTOVOLTAIC BASED INTEGRATED RANGE EXTENDER FOR ELECTRIC BICYCLE

• Main Author: Anugrah Husen Aidilla, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/59632
• Institution: Institut Teknologi Bandung

The development of electric vehicles is increasing rapidly in various parts of the world, especially the development of electric bicycles as an alternative means of transportation that can meet user needs. However, the use of electric bicycles is currently still very limited by the size of the battery, conventional charging and the absence of technology to utilize the energy that is around us for charging electric bicycle batteries. The author chooses to design a system that complements these needs. The author uses the Bafang Conversion Kit BBS02 (mid-drive) as the base system, with a battery charging voltage of 56.4V. The maximum system current is 15A, with the largest load of 750W and energy stored in the battery 542.4 Wh. The system is then designed based on these parameters with a 400W 80V series solar panel, the voltage divider ratio is taken from a maximum 80V and a 3.3V reader, and a circuit breaker rated 30A. Data acquisition is done by sending voltage and current readings at relevant points to Google Forms as well as Global Positioning System (GPS) data as performance benchmarks, with the help of the GPS module and the additional Strava application. Measurements were made several times for each condition, using photovoltaic systems or without photovoltaic systems, with moving positions or static positions, so that 4 experimental variations were obtained. The condition without photovoltaic systems is used as comparative control data. GPS data, voltage and current obtained from each experiment are then processed into easily comparable power, with the addition of weather data that affects the fluctuation of the solar panel output power. It can be seen that in all the power calculations obtained, the output power of the solar panel is very rarely close to the total power of the circuit according to the rating stated on the solar panel. This can be due to several reasons: the experiment was conducted during the rainy season and the sky was not clear; the quality of the solar panels does not match the stated rating; accuracy and calibration of data acquisition tools. The difference between the direct output power of the solar panel and the motor-battery power can also be due to: low MPPT efficiency, so the power is not fully conveyed. Apart from that, the photovoltaic system in this experiment was measured to produce an average power increase of 393.98 Wh or 83.92% in comparison to the control data with an average distance addition of 26.41 km or 79.6%.