High-torque and low-speed motor is used to pump water in a Reverse Osmosis water (RO) purification system. Single-phase AC voltage in this system is converted to DC to power the motor. Indians consume six liters of water a day on average (per member), according to a study. The average family size is about five people, and they typically use ten liters of water per day. It is anticipated that 30 L of water can be purified with 0.45 units of energy. Purifiers account for 6.53% of the monthly energy consumption of an Indian family using 135 units. Regular blackouts brought on by energy shortages impair motor performance and efficiency. As a result, using a direct DC supply from SPV could save energy that would otherwise be used for the purifier from conventional sources. When using a DC power source, the motor's efficiency will increase by about one-third when compared to the losses incurred while converting AC power to DC. Additionally, the water monitoring circuitry is necessary to stop water pollution brought on by bacteria or algae growing in the sump tank. In this paper, we developed an Automatic Transfer Switch (ATS) for IoT-Enabled Solar Photovoltaic (SPV)-based RO water purifier and analyzed the performance. The study compares the ATS-enabled system with a conventional setup, highlighting improvements in operational stability, energy efficiency, and system resilience to power fluctuations. The results reveal that the ATS significantly improves system performance and data-driven insights, contributing to the advancement of smart water purification systems and the reliability of the SPV-based RO water purifier by minimizing downtime and optimizing energy utilization.