Reserve power system for data center

A system for supplying power, comprising:

• one or more sets of computer systems;
• one or more primary power systems coupled to, and configured to supply primary power to, the one or more sets of computer systems, wherein at least one of the one or more primary power systems comprises:
• a downstream portion configured to distribute power to the one or more sets of computer systems,
• a mid-stream portion configured to supply received power to the downstream portion, and
• an upstream portion configured to selectively supply primary power from one or more primary power sources to the mid-stream portion;
• and
• a reserve power system coupled to, and configured to automatically supply reserve power to, the one or more sets of computer systems, wherein the total power requirements of the one or more sets of computer systems exceed the capacity of the reserve power system to supply power;
• wherein the reserve power system is configured to detect a failure in the upstream portion of the at least one primary power system;
• and
• wherein, in response to detecting the failure, the reserve power system is configured to selectively switch the mid-stream portion from supplying primary power received from the upstream portion of the primary power system to supplying reserve power received from an upstream portion of the reserve power system.

A system for providing reserve power to computer systems in a data center, comprising:

• a reserve power system coupled to, and configured to automatically supply power to one or more sets of computer systems receiving power from one or more primary power systems downstream of a primary power-side switchgear device if at least one condition is met, the reserve power system comprising:
• a reserve power-side switchgear device configured to supply power from one or more reserve power sources separate from one or more primary power sources supplying power to the primary power-side switchgear device;
• and
• an automatic transfer switch configured to automatically switch the one or more sets of computer systems from receiving power from a primary power source through the primary power-side switchgear device and at least one of the primary power systems to receiving power from the reserve power source through the reserve power-side switchgear device and the at least one primary power system when at least one condition is met;
• wherein the total power requirements of the one or more sets of computer systems coupled to the reserve power system exceed a capacity of the reserve power system to supply power.

A method of supplying reserve power to computer systems in a data center, comprising:

• monitoring a primary power feed supplied to at least one set of computer systems through a primary power-side switchgear device and a primary power system, wherein the primary power system is downstream of the primary power-side switchgear device;
• and
• in response to an at least partial failure of the primary power feed upstream of the primary power system, automatically switching the primary power system from supplying the primary power feed to the at least one set of computer systems to supplying a reserve power feed from a reserve power system to the at least one set of computer systems, such that the switchgear device is bypassed by the reserve power system;
• wherein the total power requirements of the one or more sets of computer systems exceed the capacity of the reserve power system to supply power.