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 ; 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 ; 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 ; 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 ; 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. <EOS>