<![CDATA[Electricity is a very important need, especially in the field of information technology development, educational facilities and households. The application of alternative electrical energy sources as backup energy by utilizing DC (direct current) energy sources from batteries (accu) which are converted through circuit stages so that they can be used as AC (Alternating current) backup energy sources. PLN electricity used to charge the battery (charge) through a step down transformer to 24Vac then rectified through a rectifier circuit in the form of a bridge rectifier aims to rectify the AC voltage to a DC voltage of 24Vdc to charge the 24Vdc battery. This automatic charger test aims to obtain the performance of the circuit that will cut off the charging current at a voltage of 13.5V on a 12V battery with a capacity of 5AH automatically when the battery is fully charged. Where the battery input comes from the rectifier output of 13.5V and the battery output will be used as input from the inverter. Before the automatic Charger circuit is connected to the battery, the battery input voltage is set at 11.5Vdc. Charging the charger produces a voltage of 13.5 volts with a maximum charging current of 1.17Amperes with a charger time of 2.5 hours, the charging process from a voltage of 11.5 Volts increases to 13.5 Volts. The temperature of the battery when charging must also be monitored so that there is no excessive heat that can damage the battery cells which reduces the life of the battery.]]>
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