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The need for an uninterrupted power supply (UPS) in a data center is obviated by tying a DC voltage from a backup power source directly to the motherboards of multiple servers in the data center. AC power received from a power utility service is converted into a lower voltage by a site transformer a

The need for an uninterrupted power supply (UPS) in a data center is obviated by tying a DC voltage from a backup power source directly to the motherboards of multiple servers in the data center. AC power received from a power utility service is converted into a lower voltage by a site transformer and then provided to one or more power distribution units at a site. The power distribution units supply power to a plurality of servers, which include power supplies that convert the AC electrical power to DC electrical power for use by the servers' motherboards. In the event of a failure of power from the utility service, the backup power source provides DC electrical power to the motherboards, e.g., for sufficient time to start up a generator to provide power in place of the utility service.

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1. A server system comprising: a power distribution unit coupled to receive AC electrical power;a plurality of motherboards, each motherboard including a plurality of electrical components, a first input, and a second input;a plurality of power supplies, each power supply coupled to the power distri

1. A server system comprising: a power distribution unit coupled to receive AC electrical power;a plurality of motherboards, each motherboard including a plurality of electrical components, a first input, and a second input;a plurality of power supplies, each power supply coupled to the power distribution unit and to the first input of one or more of the motherboards, wherein each power supply is configured to receive AC electrical power from the power distribution unit and to provide DC electrical power to the motherboard;a backup power source configured to provide DC electrical power; anda plurality of DC/DC regulators, each DC/DC regulator comprising an input coupled to the backup power source and an output coupled to the second input of at least one motherboard, the DC/DC regulator coupled between the backup power source and the second input of the at least one motherboard and configured to convert DC electrical power from the backup power source to a lower voltage. 2. The system of claim 1, wherein the backup power source is thermally isolated from each of the motherboards. 3. The system of claim 1, wherein the backup power source comprises a plurality of batteries coupled in series to increase the backup power voltage. 4. The system of claim 1, wherein the backup power source comprises a plurality of batteries coupled in parallel to provide redundancy in case of a battery failure. 5. The system of claim 1, wherein the DC electrical power supplied by the backup power source is held at a voltage below the voltage of the DC electrical power provided by the power supplies. 6. The system of claim 1, further comprising: a site transformer coupled to receive electrical power from a utility service and coupled to provide AC electrical power to the power distribution unit, wherein the site transformer is configured to transform the electrical power received from the utility service to a lower voltage. 7. The system of claim 6, wherein the site transformer is coupled to the power distribution unit without an uninterrupted power supply (UPS). 8. The system of claim 6, further comprising: a generator coupled between the site transformer and the power distribution unit, wherein the generator is configured to activate responsive to a failure of the electrical power from the utility service. 9. The system of claim 1, further comprising: a plurality of control circuits, each control circuit configured to monitor the voltage of the backup power source. 10. The system of claim 9, wherein the control circuits are configured to disconnect one or more of the motherboards from the backup power source when the voltage of the backup power source is low. 11. The system of claim 9, wherein the control circuits are communicatively coupled to a central monitoring system. 12. The system of claim 1, further comprising: a plurality of control circuits, each control circuit configured to couple the backup power source to one or more of the motherboards responsive to a failure of electrical power from the power supply associated with the motherboard. 13. The system of claim 1, further comprising: at least one control circuit configured to couple at least one power supply to the backup power source to recharge the backup power source using AC electrical power from the power distribution unit. 14. The system of claim 1, further comprising: an external charging system coupled to the backup power source and configured to recharge the backup power source responsive to an indication of a need to recharge the backup power source. 15. A server system comprising: a plurality of servers, each server comprising: a power supply configured to convert AC electrical power to DC electrical power,a DC/DC regulator configured to convert DC electrical power to a lower voltage, anda motherboard having a plurality of electrical components, a first input coupled to the power supply and configured to receive DC electrical power from the power supply for the electrical components, and a second input coupled to an output of the DC/DC regulator and configured to receive DC electrical power from the DC/DC regulator for the electrical components; anda plurality of conductor lines coupled to a backup power source, such that for each server, a conductor line electrically couples an input of the DC/DC regulator of the server to the backup power source, the backup power source for supplying backup DC electrical power to the plurality of servers, wherein, for each server, the DC/DC regulator of the server is coupled between the backup power source and the motherboard of the server. 16. The system of claim 15, wherein the backup power source is thermally isolated from the servers. 17. The system of claim 15, wherein the backup power source comprises a plurality of batteries coupled in series to increase the backup power voltage. 18. The system of claim 15, wherein the backup power source comprises a plurality of batteries coupled in parallel to provide redundancy in case of a battery failure. 19. The system of claim 15, wherein the DC electrical power supplied by the backup power source is held at a voltage below the voltage of the DC electrical power provided by the power supplies. 20. The system of claim 15, wherein each server comprises a control circuit configured to monitor a DC voltage on the conductor. 21. The system of claim 20, wherein each control circuit is configured to disconnect the motherboard from the conductor when the voltage on the conductor is low. 22. The system of claim 20, wherein each control circuit is communicatively coupled to a central monitoring system. 23. The system of claim 15, wherein each server comprises a control circuit configured to couple the conductor to one or more of the motherboards responsive to a failure of electrical power from the power supply associated with the motherboard. 24. A method comprising: receiving AC electrical power at a site from a utility service;supplying the received AC electrical power to each of a plurality of servers located at the site via a first server input;coupling a DC backup power source to an input of each of a plurality of DC/DC regulators configured to convert DC electrical power from the DC backup power source to a lower voltage, each DC/DC regulator comprising an output coupled to a second input of one or more servers, wherein each DC/DC regulator is coupled between the DC backup power source and a server; andupon failure of the AC electrical power from the utility service, supplying DC electrical power to the servers via the DC/DC regulators from the DC backup power source. 25. The method of claim 24, further comprising: thermally isolating the backup power source from each of the servers. 26. The method of claim 24, further comprising: upon failure of the AC electrical power from the utility service, activating a generator; andafter a startup period of the generator, supplying AC power from the generator to the plurality of servers located at the site. 27. The method of claim 24, further comprising: monitoring the voltage of the DC backup power source; andcommunicating the monitored voltages to a central monitoring system. 28. The method of claim 24, further comprising: disconnecting one or more of the motherboards from the DC backup power source when the voltage of the backup power source is low. 29. The server system of claim 1, wherein the plurality of motherboards are located within one or more server racks, and wherein the backup power source is located external to the one or more server racks. 30. The server system of claim 15, wherein the plurality of servers are located within one or more server racks, and wherein the backup power source is located external to the one or more server racks. 31. The method of claim 24, wherein the plurality of servers are located within one or more server racks, and wherein the DC backup power source is located external to the one or more server racks. 32. The server system of claim 1, further comprising: a plurality of control circuits, each control circuit configured to: measure the input voltage from the backup power source,measure the output voltage from one of the plurality of DC/DC regulators, andcontrol the DC/DC regulator responsive to the measured input voltage and/or measured output voltage. 33. The server system of claim 15, wherein each server further comprises a control circuit configured to: measure the input voltage from the backup power source;measure the output voltage from the DC/DC regulator; andcontrol the DC/DC regulator responsive to the measured input voltage and/or measured output voltage. 34. The method of claim 24, further comprising: measuring the input voltage from the DC backup power source;measuring the output voltage from one of the plurality of DC/DC regulators; andcontrolling the DC/DC regulator responsive to the measured input voltage and/or measured output voltage.