Continuity of electricity service is a determining factor for customer satisfaction. Research on the implementation of the ATS (Automatic Transfer Switch) system between solar cells and PLN as a power supplier for household electrical loads aims to design an ATS system to provide electrical power to the load by maintaining continuity, reducing electricity consumption costs while reducing electricity dependence on PLN so electricity consumers can benefit from technical and economic aspects. The method used is an experimental method that is designing an electrical power supply ATS system to get good design results. The equipment used is solar panels, relays, inverters, contactors, transistors, Arduino and batteries. The results show that automatic transfer switches must pay attention to an accurate and meticulous design to avoid damage to the inverter. So that the continuity of electricity service is maintained. Electricity service using a solar cell system with 2 units of 100 Ah batteries and 6 units of 100 Wp solar panels can serve household electricity loads in the afternoon around 6:00 a.m. until the morning on average at 02:30 WIB. The use of ATS design using Arduino will switch directly to the PLN supply if the PLTS is not able to serve the load in the morning at 02:30 WIB, and likewise if during the daytime the PLN dies, PLTS will be able to serve the electricity load.
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