Smart Solar Tracker System for Maximizing Solar Panel Efficiency

Solar energy is one of the cleanest and most widely available sources of power on earth, yet much of its potential goes untapped simply because solar panels are not positioned to face the sun throughout the day, and because dust and dirt accumulate on panel surfaces over time and block incoming light. This paper addresses both problems together. It presents the design, construction, and testing of a smart dual-axis solar tracking system combined with a motor-driven rotating brush mechanism for automatic panel cleaning — all controlled by a low-cost microcontroller. The tracker uses light-dependent resistors (LDRs) to detect the position of the sun and adjusts two servo motors to align the panel continuously with the sun from morning to evening. The cleaning mechanism runs a soft rotating brush across the panel surface at programmable intervals, driven by a small DC motor, removing dust without the need for water or human effort. Field testing at a rooftop installation in Pune showed that the dual-axis tracker improved daily energy output by 34.6 percent over a fixed-tilt panel, and the auto-cleaning mechanism recovered an additional 11.2 percent of output that was being lost to dust accumulation over a seven-day period. Together the two systems delivered a combined efficiency improvement of approximately 42 percent compared to a conventional fixed, unclean panel. The system uses simple, commercially available components, is easy to maintain, and is well suited to agricultural, residential, and small industrial applications in dusty regions of India.