ABSTRACT The Solar Power Plant (PLTS) during the day will charge the battery and supply the load up to a maximum battery voltage of 12,73 Volt-13,8 Volt based on the state of charge standard batteries. ATS is used to transfer connections between PLTS and PLN energy sources. In this study where ATS is controlled by Zelio Logic Smart Relay, the use of Zelio Logic Smart Relay is intended to repla…