IoT Monitoring System for Solar Power Plant Based on MQTT Publisher / Subscriber Protocol

One of the renewable sources of electrical energy that can be used as an alternative to fossil fuels is solar energy. Basically, solar energy can be converted into electrical energy by solar cells. In the operation itself, a reliable system is needed to monitor the performance of energy production in the PLTS system used so that it can be monitored and electricity supply and disturbances are maintained in real time. In this study, we proposed a monitoring system for IoT-based solar power plants using the publisher and subscriber communication method with ESP32 as a microcontroller and google cloud platform as a cloud server which can be used in real-time PV mini-grid monitoring systems. This proposed system aims to monitor the performance of PV mini-grid which displayed in the database which placed in a virtual computer that acts as an MQTT broker. The results of this study showed that the proposed system performs well and can be accessed from the existing database. Furthermore, this system has good accuracy since the measurement error value is very small and data transmission system is able to work in real time because the broker is able to receive data with a minimum response time.