Abstract: An exemplary embodiment of the invention is a power system for providing power to a critical load. The system includes a first power source producing sufficient power to supply the critical load and a second power source, independent of said first power source. The second power source produces sufficient power to supply the critical load. The system also includes a rotary device having a first power input circuit and a second power input circuit. The second power source is coupled to the rotary device at the second power input circuit. A transfer switch selectively couples the first power source to the first power input circuit and the second power input circuit.

Abstract: An exemplary embodiment of the invention is a power system including a first power source, a first DC bus coupled to the first power source and a second DC bus coupled to the first power source. A power conditioning device is coupled to the first DC bus and the second DC bus. A load receives power from the power conditioning device.

Abstract: An exemplary embodiment of the invention is a power system for providing power to a critical load. The system includes a first power source producing sufficient power to supply the critical load and a second power source, independent of said first power source. The second power source produces sufficient power to supply the critical load. The system also includes a rotary device having a first power input circuit and a second power input circuit. The second power source is coupled to the rotary device at the second power input circuit. A transfer switch selectively couples the first power source to the first power input circuit and the second power input circuit.