Portable Battery-Powered Electric Tilling Machine

Abstract

This paper presents the design, fabrication, and experimental performance evaluation of a portable battery-powered electric tilling machine developed for small-scale and marginal agricultural applications in India. The machine employs a 500W DC Gear motor, a 24V/20Ah lithium-ion battery pack, and a two-stage spur gear reduction mechanism (20:1) to drive L-shaped rotary tilling blades. The complete machine weighs approximately 18 kg and is designed for ease of transport and operation by a single adult. Experimental trials were conducted on three soil types: sandy loam, clay, and red laterite. The machine achieved tilling depths of 118–148 mm, area coverage rates of 11.4–18.2 m²/hr, and battery operational durations of 1.4–2.1 hours per charge. The total fabrication cost was approximately INR 10,130, representing a 38–61% cost reduction compared to commercially available petrol-powered equivalents. Ergonomic evaluation by five test operators yielded an average satisfaction rating of 4.3/5.0. Results confirm the technical feasibility and economic viability of battery-powered electric tillers as a sustainable alternative for smallholder farmers in India.

Introduction

Tillage is a critical but labor-intensive agricultural operation used to prepare soil for planting. In India, where most farmers are small or marginal landholders, traditional manual tillage causes significant physical strain and health issues, while large tractor-based equipment is often unsuitable for small and irregular fields. Petrol-powered mini tillers offer some mechanization benefits but are expensive to operate, noisy, polluting, and maintenance-intensive.

Recent reductions in lithium-ion battery costs and advancements in Brushless DC (BLDC) motor technology have made electric tillers a promising alternative. Electric tillers produce no direct emissions, operate more quietly, require less maintenance, and can be powered through grid or solar charging. However, limited research has focused on electric tillers designed specifically for Indian farming conditions.

This study presents the design, fabrication, and field evaluation of a portable electric tilling machine. The main contributions include:

1. A complete engineering design methodology covering motor sizing, gear ratio design, and structural considerations.
2. Experimental performance evaluation on different Indian soil types.
3. An economic comparison with petrol-powered tillers.

Literature Review Highlights

Previous studies have shown that mechanization can reduce farmer physical stress by over 60% and improve productivity by 3–5 times. Research has identified BLDC motors as highly efficient and suitable for portable agricultural equipment. Existing electric tiller prototypes demonstrated feasibility but lacked comprehensive testing across multiple soil types and detailed economic analyses. This study addresses these gaps.

Design and Methodology

The machine was designed for small farmers, kitchen gardens, and greenhouse operations with the following key specifications:

• Tilling width: 300 mm
• Tilling depth: 100–150 mm
• Motor: 500 W, 24 V DC gear motor
• Battery: 24 V, 20 Ah lithium-ion
• Blade speed: 150 RPM
• Weight: ≤ 20 kg
• Fabrication cost: ≤ ?15,000
• Operating duration: ≥ 2 hours

Power System Design

Using soil resistance calculations, the required motor power was estimated at approximately 527 W. A 500 W DC gear motor with overload capability was selected. Battery sizing indicated that a 24 V, 20 Ah lithium-ion battery could support about 2 hours of operation under typical conditions.

Gear Reduction Design

To reduce motor speed from 3000 RPM to the desired blade speed of 150 RPM, a two-stage spur gear reduction system with a total ratio of 20:1 was designed:

• Stage 1: 5:1 reduction
• Stage 2: 4:1 reduction

The resulting output torque was calculated as approximately 27 Nm, providing sufficient force for effective tilling in small-farm applications.

Conclusion

This paper presented the complete engineering design, fabrication, and experimental performance evaluation of a portable battery-powered electric tilling machine for small-scale Indian agriculture. The following conclusions are drawn: 1) A 500W DC Gear motor with a 20:1 two-stage spur gear reduction provides adequate blade torque for tilling sandy loam, red laterite, and clay soils to depths of 118–148 mm. 2) The 24V/20Ah Li-ion battery pack delivers 1.4–2.1 hours of operational duration depending on soil type, satisfying the design target for typical small-farm daily operations. 3) Area coverage rates of 11.4–18.2 m²/hr are achieved across the three soil types tested, enabling tilling of 25–36 m² per battery charge. 4) The prototype fabrication cost of INR 21,630 is 38–61% lower than equivalent petrol-powered alternatives, with operational costs approximately 10–15 times lower per hour. 5) Ergonomic assessment yielded an overall satisfaction score of 4.3/5.0, confirming the machine\'s usability for adult operators including women and elderly farmers. 6) The machine produces significantly lower noise (68–71 dB vs. 85–95 dB) and zero direct emissions compared to petrol tillers, offering clear environmental and health benefits. Future work should focus on a higher-power motor for improved clay soil performance, automatic depth control, solar charging integration, and extensive long-duration field trials across diverse agro-climatic zones.

References

This paper presented the complete engineering design, fabrication, and experimental performance evaluation of a portable battery-powered electric tilling machine for small-scale Indian agriculture. The following conclusions are drawn: 1) A 500W DC Gear motor with a 20:1 two-stage spur gear reduction provides adequate blade torque for tilling sandy loam, red laterite, and clay soils to depths of 118–148 mm. 2) The 24V/20Ah Li-ion battery pack delivers 1.4–2.1 hours of operational duration depending on soil type, satisfying the design target for typical small-farm daily operations. 3) Area coverage rates of 11.4–18.2 m²/hr are achieved across the three soil types tested, enabling tilling of 25–36 m² per battery charge. 4) The prototype fabrication cost of INR 21,630 is 38–61% lower than equivalent petrol-powered alternatives, with operational costs approximately 10–15 times lower per hour. 5) Ergonomic assessment yielded an overall satisfaction score of 4.3/5.0, confirming the machine\'s usability for adult operators including women and elderly farmers. 6) The machine produces significantly lower noise (68–71 dB vs. 85–95 dB) and zero direct emissions compared to petrol tillers, offering clear environmental and health benefits. Future work should focus on a higher-power motor for improved clay soil performance, automatic depth control, solar charging integration, and extensive long-duration field trials across diverse agro-climatic zones.

Copyright

Copyright © 2026 Nilesh Kumar, Dhiraj Patil, Bhagyesh Davane, Ruchik Tamore, Prof. Iqbal Mansuri. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.