Design and Development of Automated Solar Grass Trimmer with Charge Control Circuit

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Thangavel Bhuvaneswari
Chitra Venugopa
Sarah Immanuel
Emerson Raja
Wei Chern Chua


The focus of this paper is the design and development of an automatic solar grass trimmer prototype, emphasizing high operational efficiency with renewable energy as the primary power source. This solar-based device not only contributes to reduced air pollution but also aligns with environmental sustainability objectives. The prototype features a charge control circuit and is powered by a rechargeable 12V battery. To address low battery levels, a solar panel is employed for automatic recharging. A DC-DC buck converter is integrated to step down the higher voltage from the solar panel to match the battery requirements. Safety features, such as a current limiter and overcharge protection circuits, have been incorporated into the design. The paper provides a detailed discussion on the conceptual design of the solar grass trimmer, including the placement of sensors and motors. Additionally, the cutting motor force analysis and total weight calculation of the prototype are presented.The solar charge control circuit, along with details on the current limiter and overcharge protection circuit, is thoroughly explored. Successful development of the prototype is reported, and the battery charging circuits are analyzed using a Bench PSU and solar panel. The paper includes plots of voltage, current, and power generated by the solar panel under various weather conditions. A comparison between Bench PSU and solar panel power is also provided. This research contributes to the advancement of automated solar-powered devices, offering sustainable solutions for environmentally friendly grass trimming.


[Manuscript received: 11 October 2023 | Accepted: 29 January 2024 | Published: 30 April 2024]

Article Details

How to Cite
Thangavel , B., Chitra , V. ., Immanuel, S. ., Raja, E., & Chua , W. C. (2024). Design and Development of Automated Solar Grass Trimmer with Charge Control Circuit. International Journal on Robotics, Automation and Sciences, 6(1), 36–45.


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