IJRCS International Journal of Robotics and Control Systems Vol. 3, No. 1, 2023, pp. 59-73 ISSN 2775-2658 http://pubs2.ascee.org/index.php/ijrcs http://dx.doi.org/10.31763/ijrcs.v3i1.843 ijrcs@ascee.org Energy Monitoring and Control of Automatic Transfer Switch between Grid and Solar Panel for Home System Joko Slamet Saputro a,1 , Hari Maghfiroh a,2,* , Feri Adriyanto a,3 , Muhammad Renaldy Darmawan a,4 , Muhammad Hamka Ibrahim a,b,5 , Subuh Pramono a,b,6 a Department of Electrical Engineering, Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Surakarta 57126, Indonesia b Graduate School of Science and Engineering, Chiba University, Japan 1 jssaputro89@staff.uns.ac.id; 2 hari.maghfiroh@staff.uns.ac.id; 3 feri.adriyanto@staff.uns.ac.id; 4 mrenaldy0101@student.uns.ac.id; 5 hamkanen@gmail.com; 6 subuhpramono@gmail.com * Corresponding Author 1. Introduction As technology develops, the need for electrical energy also increases, but the demand for electric power is not proportional to the increase in the availability of electric power [1]. In this digital era, most aspects of life require a supply of electrical energy to run correctly, and some people in Indonesia depend on electrical power from the National Electric Company (PLN), so it can be said that electricity is one of the primary needs [2][3]. The fossil fuels used in electricity production also increase to meet the increasing availability of electricity. In addition, there is the possibility of disruption in the distribution of PLN's electricity from power plants to consumers, which is distributed through an open transmission network, causing power outages on the consumer side [4]. The use of new and renewable energy continues to be developed to reduce the use of fossil fuels to meet electricity needs. One of the renewable energies that are being intensively developed is solar energy. Solar energy can be used on a small scale, such as the household scale, so it is a form of renewable energy power generation that is easily accessible. However, solar power plants have limited irradiation time and have an average effective irradiation of only eight hours a day, so if it is not ARTICLE INFO ABSTRACT Article history Received December 16, 2022 Revised January 05, 2023 Accepted January 07, 2023 In this digital age, most aspects of life require an electric supply. The availability of electrical power is very critical to maintaining the continuity of the system in various applications. To maintain system continuity, the Energy Monitoring and Control of an Automatic Transfer Switch (ATS) between the Grid and Solar Panel is proposed. The system consists of an Automatic Transfer Switch, Home Solar Power Plant, and Automatic Charging. The function of the monitoring system is to monitor the voltage, current, and power across the device, the operation mode of the ATS, and the State of Charge (SoC) of the battery. The control system is to control the operation mode of ATS according to the energy source selected by the user on the Internet of Things (IoT) interface. The results show that the system can successfully monitor solar panel conditions, AC output, and battery's State of Charge through Blynk IoT. The ATS works automatically with a switching delay of 20ms to 26ms, while on the user's command, the average switching delay is 303.33ms to activate the relay and 185ms to deactivate the relay. Keywords Automatic Transfer Switch; Energy Monitoring; Automatic Charging; Internet of Things; Solar Powered This is an open-access article under the CC–BY-SA license.