Pengembangan Sistem PLTS Cadangan dengan Automatic Transfer Switch dan Monitoring Berbasis IoT

Evi Suhaevi (Universitas Bung Karno, DKI Jakarta)
Iswidodo Iswidodo (Universitas Bung Karno, DKI Jakarta)
Deny Putra (Universitas Bung Karno, DKI Jakarta)

TIN: TERAPAN INFORMATIKA NUSANTARA
Vol 7 No 5 (2026): October 2026

Solar-based backup power systems require integrated automatic source switching and electrical monitoring to support centralized operational supervision. This study aims to develop and evaluate an Internet of Things (IoT)-based photovoltaic (PV) backup power prototype incorporating an Automatic Transfer Switch (ATS). The system integrates a 30 Wp solar panel, Solar Charge Controller (SCC), 12 V 14 Ah battery, 220 VAC inverter, relay–contactor-based ATS circuit with an 11.5 VDC switching threshold, two INA219 sensors, an ESP32 microcontroller, and the Blynk IoT Platform. Evaluation comprised three days of solar panel power measurements, utility-to-PV source transfer tests, and functional assessment of remote monitoring and control with a three-second data update interval. The recorded peak panel powers were 30.03 W, 27.28 W, and 25.20 W on the respective observation days. The ATS transfer time was 1.2 s from the utility grid to the PV inverter and 1.0 s in the reverse direction. The Blynk dashboard successfully displayed voltage, current, power, estimated battery State of Charge (SOC), and ATS control status, while also receiving manual control commands. These findings demonstrate the functional integration of the prototype as an IoT-monitored PV backup power system. Further evaluation is required to establish sensor accuracy, switching transient behavior, and long-term operational reliability.