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Technology for concurrently powering equipment from multiple power sources, and the control thereof is disclosed. One example implementation of the technology includes a first power supply that powers equipment from a first power source and a second power supply that also powers the equipment from a

Technology for concurrently powering equipment from multiple power sources, and the control thereof is disclosed. One example implementation of the technology includes a first power supply that powers equipment from a first power source and a second power supply that also powers the equipment from a second power source while the equipment is being powered by the first power supply. A target direct current (DC) output voltage of at least one of the power supplies is changed, thereby changing a ratio of the power being drawn from the first power supply to the power being drawn from the second power supply.

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1. A system, the system comprising: a first set of power supplies powered from a first power source, wherein the first set of power supplies is adapted to provide direct current (DC) power, based on a first target DC output voltage, to a DC power bus, wherein the first target DC output voltage of th

1. A system, the system comprising: a first set of power supplies powered from a first power source, wherein the first set of power supplies is adapted to provide direct current (DC) power, based on a first target DC output voltage, to a DC power bus, wherein the first target DC output voltage of the first set of power supplies is within a voltage range that is suitable for powering equipment via the DC power bus;a second set of power supplies powered from a second power source, wherein the second set of power supplies is adapted to provide DC power to the DC power bus, based on a second target DC output voltage, while the first set of power supplies is also providing power to the DC power bus, wherein the second target DC output voltage of the second set of power supplies is within the voltage range that is suitable for powering the equipment via the DC power bus;a plurality of processing units that are powered from the DC power bus; anda power system controller that is adapted to control instantaneous power draw from the first power source relative to instantaneous power draw from the second power source via adjustment of at least one of the first target DC output voltage or adjustment of the second target DC output voltage based on at least one of a cost of power from the first power source or a cost of power from the second power source, wherein the adjusted one of the at least one of the first target DC output voltage or the second target DC output voltage is within the voltage range that is suitable for powering the equipment. 2. The system of claim 1, wherein: the adjustment of the at least one of the first target DC output voltage or the second target DC output voltage causes a change in a ratio of power supplied to the plurality of processing units from the first power source to power supplied to the plurality of processing units from the second power source. 3. The system of claim 1, wherein: the adjustment of the at least one of the first target DC output voltage or the adjustment of the second target DC output voltage causes the first target DC output voltage to be higher than the second target DC output voltage; andthe adjustment of the at least one of the first target DC output voltage or the adjustment of the second target DC output voltage also causes the plurality of processing units to be powered by a greater extent from the first set of power supplies than from the second set of power supplies. 4. The system of claim 1, further comprising: an inverter adapted to receive DC power from the DC power bus, convert the received DC power to alternating current (AC) power, and power at least one of the plurality of processing units with the converted AC power. 5. The system of claim 1, further comprising: at least one power monitor adapted to monitor the instantaneous power draw from at least one of the first power source or the instantaneous power draw from the second power source and to provide information relating to the instantaneous power draw from at least one of the first power source or the instantaneous power draw from the second power source to the power system controller, wherein:the power system controller is further adapted to control the instantaneous power draw from at least one of the first power source or the instantaneous power draw from the second power source based on the information from the power monitor. 6. The system of claim 5, wherein the power system controller is further adapted to control the instantaneous power draw from at least one of the first power source or the instantaneous power draw from the second power source based on additional information, including at least one of: a cost of power from at least one of the first power source or from the second power source;an availability of power from at least one of the first power source or from the second power source;quantities of power being drawn from at least one of the first power source or from the second power source; oran instruction to change a sourcing of power from at least one of the first power source or from the second power source. 7. The system of claim 5, wherein the information is based substantially on an overall amount of power being drawn, by a facility in which the plurality of processing units are located, from at least one of the first power source or from the second power source. 8. A method of powering equipment, the method comprising: concurrently powering the equipment from a first power source through a first direct current (DC) power supply and from a second power source through a second DC power supply;determining that a change is to be made to a ratio of instantaneous power being drawn from the first power source to instantaneous power being drawn from the second power source; andadjusting a target output voltage of the first power supply relative to a target output voltage of the second power supply based on at least one of a cost of power from the first power source or a cost of power from the second power source, wherein the adjusted target output voltage of the first power supply and the target output voltage of the second power supply are both within a voltage range that is suitable for powering the equipment. 9. The method of claim 8, further comprising: determining the instantaneous power being drawn from the first power source; anddetermining the instantaneous power being drawn from the second power source, wherein determining that the change is to be made includes: determining that the change is to be made based on at least one of the determined instantaneous power being drawn from the first power source or on the determined instantaneous power being drawn from the second power source. 10. The method of claim 8, wherein: determining that the change is to be made includes: determining that the change is to be made based on at least one of a received instruction to change the ratio, a dynamic cost of power from the first power source, a dynamic cost of power from the second power source, a dynamic demand on the first power source, or a dynamic demand on the second power source. 11. The method of claim 8, wherein: determining that the change is to be made includes: determining that the change is to be made based on the instantaneous power being drawn from at least one of the first power source or the instantaneous power being drawn from the second power source based on an input;adjusting the target output voltage of the first power supply includes: making a first change to the target output voltage of the first power supply;monitoring a power draw from at least one of the first power source or from the second power source; andmaking at least one additional change to the target output voltage of the first power supply based on the monitored power draw. 12. The method of claim 11, wherein monitoring the power draw includes: monitoring a current draw from at least one of the first power source or from the second power source. 13. The method of claim 8, further comprising: providing an instruction to adjust a target output voltage of a third DC power supply, wherein the third DC power supply and a fourth DC power supply concurrently power other equipment at a same facility as the equipment. 14. The method of claim 8, wherein an output of the first DC power supply, an output of the second DC power supply, and an input of the equipment are all coupled to a same power bus. 15. The method of claim 8, wherein: the first DC power supply includes a plurality of alternating current (AC) to DC rectifiers having outputs coupled to a common DC bus;the second DC power supply includes another plurality of AC to DC rectifiers having outputs coupled to the common DC bus;the plurality of AC to DC rectifiers of the first DC power supply are adapted to provide power to the DC bus based on the target output voltage of the first power supply; andthe plurality of AC to DC rectifiers of the second DC power supply are adapted to provide power to the DC bus based on the target output voltage of the second power supply, wherein the target output voltage of the second power supply is different than the target output voltage of the first power supply. 16. An apparatus for controlling concurrent powering of equipment from multiple power sources, the apparatus comprising: an input interface adapted to receive information from at least one power monitor regarding an instantaneous power draw from at least one of a first power source or an instantaneous power draw from a second power source;a control circuit that is adapted to: receive the information from the input interface;determine, based on the received information and based on at least one of a cost of power from the first power source or a cost of power from the second power source, that a change is to be made to the instantaneous power draw from the first power source relative to the instantaneous power draw from the second power source; andgenerate an instruction to adjust a target direct current (DC) voltage output value of a first power supply that is adapted to concurrently, with a second power supply, power the equipment, wherein the first power supply is also adapted to power the equipment from the first power source and the second power supply is adapted to power the equipment from the second power source; andan output interface that is adapted to instruct the first power supply to adjust a target DC voltage of the first power supply, wherein the adjusted target output voltage of the first power supply and an output voltage of the second power supply are both within a voltage range that is suitable for powering the equipment. 17. The apparatus of claim 16, wherein the controller circuit includes at least one of a microprocessor or a microcontroller. 18. The apparatus of claim 16, wherein the first power supply outputs DC power at a power bus, the second DC power supply outputs DC power at the power bus, and the equipment draws input power from the power bus. 19. The apparatus of claim 16, wherein: either the first power source or the second power source primarily services a facility at which the equipment is located; andthe other of the first power source or the second power source provides power to the facility via an external power grid. 20. The apparatus of claim 16, wherein the equipment includes a plurality of server computing devices, and wherein the equipment is installed at a datacenter facility.