Development of an Automated Solar Tracking System with Integrated Inverter Module for Enhanced Power Generation

Abstract

Renewable energy sources are becoming one of the most important resources in today\'s world because of their many benefits. In particular, solar energy continues to be a source of non-combustible and non-polluting energy to meet our ever-growing energy needs. However, solar panels, which are important components of solar energy conversion, are not able to track the direction of sunlight through daily and seasonal changes. This reduces the area of exposure to sunlight to solar panels and the efficiency of the solar tracking system involving solar panels. We have developed a solar tracking system using a combination of micro-controller, stepper motor and light dependent resistors (LDR\'s) for the primary purpose of improving solar energy efficiency. A key part of this tracker is an Arduino controller designed to detect sunlight with the help of LDRs and then set up a ladder to position the solar panel in su?h ? w?y th?t it re?eives m?ximum sunlight. So this system can achieve greater light and can reduce the cost of generating electricity by requiring a small number of solar panels with the right shape and sunlight.

Introduction

The text describes the design and development of an automatic solar tracking system to improve solar panel efficiency compared with fixed solar panels. Solar trackers can increase energy generation by approximately 30–60% by continuously adjusting the panel position according to the sun’s movement. Fixed solar panels lose efficiency because the angle of sunlight changes throughout the day and across seasons.

The proposed system uses Arduino microcontroller, LDR (Light Dependent Resistors), stepper/DC motors, comparator circuits, and motor drivers to automatically adjust the solar panel orientation. LDR sensors detect the intensity of sunlight from different directions, and the controller moves the panel toward the direction with maximum light intensity. This ensures the solar panel receives maximum solar radiation and improves power generation.

Problem Statement:

Traditional electricity sources such as fossil fuels create environmental issues and require expensive infrastructure. The project aims to improve solar energy production by using a tracking system that automatically positions solar panels to capture more sunlight, reducing the number of panels required and lowering electricity generation costs.

Objectives:

• Develop a system that automatically adjusts solar panel position according to sunlight.
• Create a low-cost alternative to commercial solar trackers.
• Improve solar energy utilization using MPPT and inverter systems.
• Enable automatic east-to-west sun tracking for maximum energy collection.

Working Principle:

The system uses multiple LDR sensors placed on the solar panel. The light intensity detected by the LDRs is compared using a comparator circuit. The Arduino processes the difference in light intensity and controls the motor movement. The motor rotates the solar panel until equal light intensity is received, meaning the panel is aligned with the sun.

The generated solar energy is stored in a battery and converted through an inverter to supply AC loads.

Main Components:

• Solar photovoltaic panel
• Arduino controller
• LDR sensors
• LM324 comparator
• Motor driver IC (L293D)
• DC/stepper motor
• Gear mechanism
• Battery
• Inverter
• AC load
• Supporting frame structure

Advantages:

• Produces more electricity than fixed solar panels.
• Improves efficiency by keeping panels aligned with sunlight.
• Makes better use of installation space.
• Reduces overall solar power generation cost.
• Useful in areas with low sunlight or shading conditions.

Experimental Results:

The prototype was tested using a flashlight to simulate sunlight movement. The LDR sensors successfully detected changes in light direction, and the motor adjusted the panel position accordingly. The tracking solar panel showed higher voltage and current output compared with a fixed solar panel.

The study compared single-axis and dual-axis tracking systems:

• Dual-axis trackers provide higher efficiency because they adjust in multiple directions.
• Single-axis trackers are more economical and provide similar performance in regions with strong sunlight.

Therefore, a single-axis tracker was selected due to its lower cost and acceptable energy improvement.

Future Scope:

The solar tracker can be further improved by:

• Developing a more accurate dual-axis tracking system.
• Improving tracking accuracy under different weather conditions.
• Reducing cost and simplifying implementation.
• Using advanced control methods for better energy optimization.

Conclusion

In this project a solar tracker has been upgraded to increase the amount of energy generated by the solar panel as the sun passes through the sky. A controller was used to control the movement of the solar panel. The system is designed to be independent; so much so that the energy produced by the solar panel will be used to charge two batteries of lead acid. In this project some difficulties regarding placement or LDR are faced, so that at the same time more than two LDRs can be implemented. All readings are taken very carefully during the project to eliminate as many errors as possible.

References

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Copyright

Copyright © 2026 Mr. Saurabh Moon, Dr. Nilesh Bodne, Prof. Prachi Chintawar. 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.