The demand for high-efficiency DC-DC converters is growing rapidly, especially for use in batteryoperated. To increase the supply DC input from power sources such as batteries, solar panels, and output from rectifiers, DC supplies, or DC generators, boost converters are used. This research designed a 24 VDC to 400 VDC voltage booster, tested using a 220 Vac amplification inverter system with an output of 220 Vac. The EGS-002 inverter used in this research was equipped with a Sinusoidal Pulse Width Modulation (SPWM) driver, a method that produces an output signal in the form of a pure sinusoidal wave. The test was carried out by connecting the inverter circuit directly with a voltage booster circuit in the form of a 400VAC step-up transformer to produce 24 VDC input and 50-400VDC output voltages. The length, width and height of the voltage booster are 55 cm x 35 cm x 15 cm, equipped with a cooling fan consisting of a 24V battery charger, and 4 VDC output terminals.