A welding-type power system, comprising: a power supply; an energy storage device; and a power bus configured to connect a power output of the power supply to a welding-type output; characterised in that: the power bus is further configured to connect a power output of the power supply to an auxiliary output; wherein the welding-type output is configured to supply the entire power bus voltage to a balanced load and the auxiliary output is configured to supply a portion of the power bus voltage to an imbalanced load; and wherein the system further comprises: a sensor configured to detect a power load characteristic on the power bus; a bi-directional 3-level converter to connect the energy storage device to the power bus, the bi-directional 3-level converter comprising a plurality of switches (203,205,207,209); and a controller configured to adjust an output duty cycle of the bi-directional 3-level converter to balance the power bus in response to an imbalanced load, to convert power from the power bus to recharge the energy storage device, or to convert power from the energy storage device to provide power to the power bus, in response to the power load characteristic. a power supply; an energy storage device; and a power bus configured to connect a power output of the power supply to a welding-type output; characterised in that: the power bus is further configured to connect a power output of the power supply to an auxiliary output; wherein the welding-type output is configured to supply the entire power bus voltage to a balanced load and the auxiliary output is configured to supply a portion of the power bus voltage to an imbalanced load; and wherein the system further comprises: a sensor configured to detect a power load characteristic on the power bus; a bi-directional 3-level converter to connect the energy storage device to the power bus, the bi-directional 3-level converter comprising a plurality of switches (203,205,207,209); and a controller configured to adjust an output duty cycle of the bi-directional 3-level converter to balance the power bus in response to an imbalanced load, to convert power from the power bus to recharge the energy storage device, or to convert power from the energy storage device to provide power to the power bus, in response to the power load characteristic. the power bus is further configured to connect a power output of the power supply to an auxiliary output; wherein the welding-type output is configured to supply the entire power bus voltage to a balanced load and the auxiliary output is configured to supply a portion of the power bus voltage to an imbalanced load; and wherein the system further comprises: a sensor configured to detect a power load characteristic on the power bus; a bi-directional 3-level converter to connect the energy storage device to the power bus, the bi-directional 3-level converter comprising a plurality of switches (203,205,207,209); and a controller configured to adjust an output duty cycle of the bi-directional 3-level converter to balance the power bus in response to an imbalanced load, to convert power from the power bus to recharge the energy storage device, or to convert power from the energy storage device to provide power to the power bus, in response to the power load characteristic. a sensor configured to detect a power load characteristic on the power bus; a bi-directional 3-level converter to connect the energy storage device to the power bus, the bi-directional 3-level converter comprising a plurality of switches (203,205,207,209); and a controller configured to adjust an output duty cycle of the bi-directional 3-level converter to balance the power bus in response to an imbalanced load, to convert power from the power bus to recharge the energy storage device, or to convert power from the energy storage device to provide power to the power bus, in response to the power load characteristic.