An aircraft power distribution system comprising: a power supply, the power supply comprising: a set of power storage units arranged in series, each power storage unit having a respective direct current, DC, dischargeable power storage device, a first selectable connection configured to enable a voltage output of the respective power storage device, and a second selectable connection configured to enable bypassing the voltage output of the respective power storage device; a controller module communicatively connected with the set of first selectable connections and the set of second selectable connections and configured to selectively enable at least a subset of the first selectable connections or a subset of the second selectable connections; and a voltage output for the set of power storage units; a set of power buses (32, 34, 433); and characterized in that the system further comprises a switch configured to switchably electrically connect the voltage output with a power bus from the set of power buses (32, 34, 433), wherein the power buses in the set of power buses (32, 34, 433) have different electrical characteristics from each other; wherein: the controller module is configured to selectively enable at least a subset of the first selectable connections or a subset of the second selectable connections; the selective enabling is configured to emulate an AC waveform at the voltage output; and the set of power storage units includes a first set of power storage units arranged in series and connected with the voltage output, the first set of power storage units having a positive voltage DC dischargeable power storage device, and a second set of power storage units arranged in series and connected with the voltage output, the second set of power storage units having a negative voltage DC dischargeable power storage device; and the set of power buses (32, 34, 433) includes at least one DC power bus and at least one AC power bus. a power supply, the power supply comprising: a set of power storage units arranged in series, each power storage unit having a respective direct current, DC, dischargeable power storage device, a first selectable connection configured to enable a voltage output of the respective power storage device, and a second selectable connection configured to enable bypassing the voltage output of the respective power storage device; a controller module communicatively connected with the set of first selectable connections and the set of second selectable connections and configured to selectively enable at least a subset of the first selectable connections or a subset of the second selectable connections; and a voltage output for the set of power storage units; a set of power storage units arranged in series, each power storage unit having a respective direct current, DC, dischargeable power storage device, a first selectable connection configured to enable a voltage output of the respective power storage device, and a second selectable connection configured to enable bypassing the voltage output of the respective power storage device; a controller module communicatively connected with the set of first selectable connections and the set of second selectable connections and configured to selectively enable at least a subset of the first selectable connections or a subset of the second selectable connections; and a voltage output for the set of power storage units; a set of power buses (32, 34, 433); and characterized in that the system further comprises a switch configured to switchably electrically connect the voltage output with a power bus from the set of power buses (32, 34, 433), wherein the power buses in the set of power buses (32, 34, 433) have different electrical characteristics from each other; wherein: the controller module is configured to selectively enable at least a subset of the first selectable connections or a subset of the second selectable connections; the selective enabling is configured to emulate an AC waveform at the voltage output; and the set of power storage units includes a first set of power storage units arranged in series and connected with the voltage output, the first set of power storage units having a positive voltage DC dischargeable power storage device, and a second set of power storage units arranged in series and connected with the voltage output, the second set of power storage units having a negative voltage DC dischargeable power storage device; and the set of power buses (32, 34, 433) includes at least one DC power bus and at least one AC power bus. the controller module is configured to selectively enable at least a subset of the first selectable connections or a subset of the second selectable connections; the selective enabling is configured to emulate an AC waveform at the voltage output; and the set of power storage units includes a first set of power storage units arranged in series and connected with the voltage output, the first set of power storage units having a positive voltage DC dischargeable power storage device, and a second set of power storage units arranged in series and connected with the voltage output, the second set of power storage units having a negative voltage DC dischargeable power storage device; and the set of power buses (32, 34, 433) includes at least one DC power bus and at least one AC power bus.