Design of an Ultra-Low Powered Data-Logger for Stand-Alone PV Energy Systems

Abstract

This paper presents an open-source, ultra-low powered data-logger for off-grid photovoltaic (PV) energy systems. Deep-sleep mode of ESP32-S2 microcontroller is used along with voltage, current, and light sensors for logging the data of PV energy system to an external micro SD card. A toggle switch is used to switch the operational modes of data-logger between deep-sleep and web-server modes. Real-time PV data can be monitored in a local web-portal programmed in the microcontroller. The same web-portal is also used to check and download the historical data of a PV energy system. The energy consumption of the designed system is 7.33mWh during deep-sleep mode and 425mWh during the web-server mode. The total cost of the designed data-logger is C$ 30.

Development and Evaluation of an Arduino-Based Data Logging System Integrated with Microsoft Excel for Monitoring On-Grid Photovoltaic Systems

“…Rehman & Iqbal [4] presented an ultra-low powered data logger for off-grid PV systems. Utilizing deep-sleep mode and ESP32-S2 microcontroller, the logger records major system parameters, offering both manual and automatic monitoring modes.…”

Development of Stand-Alone DC Energy Datalogger for Off- Grid PV System Application Based on Microcontroller

“…Another power data logger for a PV system, which has been developed by using a microcontroller (micro-C), has been presented by Rehman and Iqbal (2020) adapting ESP32-S2 micro-C, while Gupta et al (2017) adapted the Arduino UNO, and Borza and Kaplani (2019) adapted the atmega328P board. Figure 1 shows the commercial measurement and monitoring device of PV systems available on the market, with a price starting from RM 600.00 and above.…”