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A power delivery system includes a power supply unit, a secondary power unit, a controller, and a monitor. The power supply unit is configured to receive primary power and provide operating DC power to a DC load. The secondary power unit is configured to store energy from the primary power. The cont

A power delivery system includes a power supply unit, a secondary power unit, a controller, and a monitor. The power supply unit is configured to receive primary power and provide operating DC power to a DC load. The secondary power unit is configured to store energy from the primary power. The controller is configured to control the secondary power unit during a testing period such that the secondary power unit uses the stored energy to provide secondary DC power to the load instead of the operating DC power. The monitor is configured to monitor the operation of the secondary power unit during the testing period and provide a signal indicative of whether the secondary power unit operated within defined parameters during the testing period.

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1. A power delivery system comprising: a power supply unit configured to receive primary power and provide operating DC power to a DC load, wherein the power supply comprises a selection circuit, the selection circuit being configured to select between power from the primary power and secondary powe

1. A power delivery system comprising: a power supply unit configured to receive primary power and provide operating DC power to a DC load, wherein the power supply comprises a selection circuit, the selection circuit being configured to select between power from the primary power and secondary power from the secondary power unit, the selection circuit being configured to provide the selected power to the DC load, wherein the selection circuit is configured to select the secondary power when the voltage of the secondary power is higher than the voltage of the power from the primary power based on characteristics of the power from the primary power and the secondary power, the characteristics including the voltage of the power from the primary power and the voltage of the secondary power;a secondary power unit configured to receive power from the primary power, store energy from the primary power, and, when the primary power is outside of a specified operating range, use the stored energy to provide secondary DC power to the load instead of the operating DC power;a controller configured to control the secondary power unit during a testing period such that the secondary power unit uses the stored energy to provide secondary DC power to the load instead of the operating DC power while the primary power is received by the power supply unit and is within the specified operating range such that the voltage of the secondary power is higher than the voltage of the power from the primary power; anda monitor configured to monitor the operation of the secondary power unit during the testing period and provide a signal indicative of whether the secondary power unit operated within defined parameters during the testing period. 2. The system of claim 1, wherein the selection circuit comprises: a first diode having an anode and a cathode, wherein the anode of the first diode is configured to receive power from the primary power and the cathode of the first diode is configured to provide power to a node; anda second diode having an anode and a cathode, wherein the anode of the second diode is configured to receive power from the secondary power unit and the cathode of the second diode is configured to provide power to the node. 3. The system of claim 1, wherein the DC load includes one or more processors. 4. The system of claim 1, wherein the secondary power unit comprises: a charger configured to receive power;an energy storage device configured to receive power from the charger and store energy from the received power;a step-up converter configured to receive power from the energy storage medium and deliver power to the selection circuit; anda primary monitoring unit configured to monitor the primary power and to control the converter based on a state of the primary power. 5. A power delivery system comprising: a power supply unit configured to receive AC input power as primary power and provide operating DC power to a DC load;a secondary power unit configured to receive power from the primary power, store energy from the primary power, and, when the primary power is outside of a specified operating range, use the stored energy to provide secondary DC power to the load instead of the operating DC power;a controller configured to control the secondary power unit during a testing period such that the secondary power unit uses the stored energy to provide secondary DC power to the load instead of the operating DC power while the primary power is received by the power supply unit and is within the specified operating range; and a monitor configured to monitor the operation of the secondary power unit during the testing period and provide a signal indicative of whether the secondary power unit operated within defined parameters during the testing period;wherein the power supply unit includes: an AC/DC stage configured to receive the AC input power and convert the received AC input power to DC power;a DC/DC stage configured to receive the DC power from the AC/DC stage and convert the received DC power to the operating DC power; anda selection circuit, the selection circuit being configured to select between the DC power from the AC/DC stage and the secondary DC power from the secondary power unit, the selection circuit being configured to provide the selected power to the DC/DC stage, wherein the selection circuit is configured to select between the DC power from the AC/DC stage and the secondary DC power from the secondary power unit based on characteristics of the DC power from the AC/DC stage and the secondary DC power from the secondary power unit. 6. The system of claim 5 wherein: the characteristics include the voltage of the DC power from the AC/DC stage and the voltage of the secondary DC power from the secondary power unit;the selection circuit is configured to select the secondary DC power when the voltage of the secondary DC power is higher than the voltage of the DC power from the AC/DC stage; andthe controller is configured to control the secondary power unit during the testing period such that the voltage of the secondary DC power is higher than the voltage of the power from the AC/DC stage. 7. The system of claim 5, wherein the selection circuit comprises: a first diode having an anode and a cathode, wherein the anode of the first diode is configured to receive power from the primary power and the cathode of the first diode is configured to provide power to a node; anda second diode having an anode and a cathode, wherein the anode of the second diode is configured to receive power from the secondary power unit and the cathode of the second diode is configured to provide power to the node. 8. The system of claim 5, wherein the DC load includes one or more processors. 9. The system of claim 5, wherein the secondary power unit comprises: a charger configured to receive power;an energy storage device configured to receive power from the charger and store energy from the received power;a step-up converter configured to receive power from the energy storage medium and deliver power to the selection circuit; anda primary monitoring unit configured to monitor the primary power and to control the converter based on a state of the primary power. 10. A method of controlling a power delivery system that includes a power supply unit configured to receive primary power and provide operating DC power to a DC load, a secondary power unit configured to receive power from the primary power, store energy from the primary power, and, when the primary power is outside of a specified operating range, use the stored energy to provide secondary DC power to the load instead of the operating DC power, and a selection circuit, the selection circuit being configured to select between power from the primary power and power from the secondary power unit, the selected power being provided to the DC load and the selection circuit being configured to select the power from the secondary power unit when a voltage of the power from the secondary power unit is higher than a voltage of the power from the primary power, the method comprising: controlling the secondary power unit during a testing period such that the secondary power unit uses the stored energy to provide secondary DC power to the load instead of the operating DC power while the primary power is received by the power supply unit and is within the specified operating range such that the voltage of the power from the secondary power unit is higher than the voltage of the power from the primary power; andreceiving a signal indicative of whether the secondary power unit operated within defined parameters during the testing period. 11. The method of claim 10, wherein the selection circuit comprises: a first diode having an anode and a cathode, wherein the anode of the first diode is configured to receive power from the primary power and the cathode of the first diode is configured to provide power to a node; anda second diode having an anode and a cathode, wherein the anode of the second diode is configured to receive power from the secondary power unit and the cathode of the second diode is configured to provide power to the node. 12. The method of claim 10, wherein the DC load includes one or more processors. 13. The method of claim 10 wherein receiving the signal indicative of whether the secondary power unit operated within defined parameters during the testing period includes receiving a fault signal from the secondary power unit that indicates the secondary power unit was not able to provide a threshold current or voltage during the test period, the method comprising providing an alert for the secondary power unit. 14. The method of claim 10 wherein receiving the signal indicative of whether the secondary power unit operated within defined parameters during the testing period includes receiving a fault signal from the secondary power unit that indicates the secondary power unit was not able to provide a threshold current or voltage during the test period; andthe DC load includes at least one processor,the method comprising controlling an operation of the processor in response to receiving the fault signal. 15. The method of claim 14 wherein controlling the operation of the processor includes preventing the processor from processing jobs designated as critical. 16. A method of controlling a power delivery system that includes a power supply unit configured to receive AC input power as primary power and provide operating DC power to a DC load and a secondary power unit configured to receive power from the primary power, store energy from the primary power, and, when the primary power is outside of a specified operating range, use the stored energy to provide secondary DC power to the load instead of the operating DC power, wherein the power supply unit includes: an AC/DC stage configured to receive the AC input power and convert the received AC input power to DC power;a DC/DC stage configured to receive the DC power from the AC/DC stage and convert the received DC power to the operating DC power; anda selection circuit, the selection circuit being configured to select between the DC power from the AC/DC stage and the secondary DC power from the secondary power unit, wherein the selected power is provided to the DC/DC stage and the selection circuit is configured to select the secondary DC power from the secondary power unit when a voltage of the secondary DC power is higher than a voltage of the DC power from the AC/DC stage;the method comprising: controlling the secondary power unit during the testing period such that the secondary power unit uses the stored energy to provide secondary DC power to the load instead of the operating DC power while the primary power is received by the power supply unit and is within the specified operating range such that the voltage of the secondary DC power from the secondary power unit is at a specified level above the DC power provided by the AC/DC stage; andreceiving a signal indicative of whether the secondary power unit operated within defined parameters during the testing period. 17. The method of claim 16 wherein receiving the signal indicative of whether the secondary power unit operated within defined parameters during the testing period includes receiving a fault signal from the secondary power unit that indicates the secondary power unit was not able to provide a threshold current or voltage during the test period, the method comprising providing an alert for the secondary power unit. 18. The method of claim 16 wherein: receiving the signal indicative of whether the secondary power unit operated within defined parameters during the testing period includes receiving a fault signal from the secondary power unit that indicates the secondary power unit was not able to provide a threshold current or voltage during the test period; andthe DC load includes at least one processor,the method comprising controlling an operation of the processor in response to receiving the fault signal. 19. The method of claim 18 wherein controlling the operation of the processor includes preventing the processor from processing jobs designated as critical. 20. A method of controlling a power delivery system that includes multiple power supply systems, each of the power supply systems including a power supply unit having a selection circuit and configured to receive primary power and provide operating DC power to a DC load and a secondary power unit configured to receive power from the primary power, store energy from the primary power, and, when the primary power is outside of a specified operating range, use the stored energy to provide secondary DC power to the load instead of the operating DC power, the selection circuit being configured to select between power from the primary power and power from the secondary power unit, the selected power being provided to the corresponding DC load and the selection circuit being configured to select the power from the secondary power unit when a voltage of the power from the secondary power unit is higher than a voltage of the power from the primary power and, the method comprising: selecting one or more of the power supply systems for testing;controlling the secondary power unit of each of the selected power supply systems such that the secondary power unit uses the stored energy to provide secondary DC power to the load instead of the operating DC power while the primary power is received by the power supply unit and is within the specified operating range such that the voltage of the power from the secondary power unit is higher than the voltage of the power from the primary power; andreceiving a signal, for each of the selected power supply systems, indicative of whether the corresponding secondary power unit operated within defined parameters during the testing period. 21. The method of claim 20, wherein at least one the selection circuits comprise: a first diode having an anode and a cathode, wherein the anode of the first diode is configured to receive power from the primary power and the cathode of the first diode is configured to provide power to a node; anda second diode having an anode and a cathode, wherein the anode of the second diode is configured to receive power from the secondary power unit and the cathode of the second diode is configured to provide power to the node. 22. The method of claim 20, wherein the DC load includes one or more processors. 23. The method of claim 20 wherein receiving a signal, for each of the selected power supply systems, indicative of whether the corresponding secondary power unit operated within defined parameters includes receiving a fault signal from at least one of the power supply systems that indicates the corresponding secondary power unit was not able to provide a threshold current or voltage during the test period. 24. The method of claim 23 comprising providing an alert for the power supply system that sent the fault signal. 25. The method of claim 23 wherein the DC load associated with the power supply system that sent the fault signal includes at least one processor, the method comprising controlling an operation of the processor in response to receiving the fault signal. 26. The method of claim 25 wherein controlling the operation of the processor includes preventing the processor from processing jobs designated as critical.