Bangladesh faces a critical energy crisis characterized by depleting resources and increasing demand. To address this challenge, solar power grids offer a viable solution. Central to these solar micro-grids is the battery bank, which stores energy to meet load demands. The performance of the battery bank relies on the efficiency of individual cells, making cell monitoring essential for maximizing energy utilization and improving power quality. This also reduces reliance on fossil fuel generators. Our project introduces an innovative battery monitoring system that employs a microcontroller and transmitting cell data to a central dashboard via an RF-based wireless network. This system includes an alert feature that notifies operators of any malfunctions, facilitating timely maintenance. We successfully identified defective battery cells and transmitted this information to a central dashboard, enabling remote monitoring of the off-grid battery bank system. By implementing Internet of Things (IoT) technology, our solution enhances operational efficiency and contributes to a more sustainable energy future for Bangladesh.