An uninterruptible power supply system comprising: an input configured to receive input power from an input power source; an output configured to provide output power to a load; a power factor correction circuit coupled to the input and configured to draw input current from the input; an inverter having a first connection and a second connection, the second connection of the inverter being coupled to the output and configured to provide output current to the output; a first capacitor and a second capacitor coupled to a DC bus , the first capacitor and the second capacitor being selectively coupled to the power factor correction circuit and to the first connection of the inverter ; a first switch coupled to the first capacitor and a second switch coupled to the second capacitor; a first neutral clamp switch and a second neutral clamp switch coupled to the power factor correction circuit and the inverter; and a controller coupled to the first switch, the second switch, the first neutral clamp switch, and the second neutral clamp switch, the controller being configured to: control the first switch and the second switch to direct current from the power factor correction circuit to the first connection of the inverter to bypass the DC bus in a first mode of operation and to direct current from the DC bus to the inverter in a second mode of operation; and control the first neutral clamp switch and the second neutral clamp switch to control a level of the input current drawn by the power factor correction circuit and a level of the output current provided by the inverter to the output. an input configured to receive input power from an input power source; an output configured to provide output power to a load; a power factor correction circuit coupled to the input and configured to draw input current from the input; an inverter having a first connection and a second connection, the second connection of the inverter being coupled to the output and configured to provide output current to the output; a first capacitor and a second capacitor coupled to a DC bus , the first capacitor and the second capacitor being selectively coupled to the power factor correction circuit and to the first connection of the inverter ; a first switch coupled to the first capacitor and a second switch coupled to the second capacitor; a first neutral clamp switch and a second neutral clamp switch coupled to the power factor correction circuit and the inverter; and a controller coupled to the first switch, the second switch, the first neutral clamp switch, and the second neutral clamp switch, the controller being configured to: control the first switch and the second switch to direct current from the power factor correction circuit to the first connection of the inverter to bypass the DC bus in a first mode of operation and to direct current from the DC bus to the inverter in a second mode of operation; and control the first neutral clamp switch and the second neutral clamp switch to control a level of the input current drawn by the power factor correction circuit and a level of the output current provided by the inverter to the output. control the first switch and the second switch to direct current from the power factor correction circuit to the first connection of the inverter to bypass the DC bus in a first mode of operation and to direct current from the DC bus to the inverter in a second mode of operation; and control the first neutral clamp switch and the second neutral clamp switch to control a level of the input current drawn by the power factor correction circuit and a level of the output current provided by the inverter to the output. <EOS>