Patent ID: 8476787

Claim:
A method of monitoring a power state of an uninterruptible power supply, the uninterruptible power supply including non-volatile data storage, a first interface, and a second interface, the method comprising: providing, by the uninterruptible power supply, uninterruptible power to a load separate from and external to the uninterruptible power supply; receiving, via the first interface from a first source of a plurality of sources, a first request to directly change the power state of the uninterruptible power supply; initiating, by the uninterruptible power supply, a first change of power state based on the first request, the first change of power state having a first type; changing, by the uninterruptible power supply, the uninterruptible power provided to the load in accord with the first change of power state; logging, by the uninterruptible power supply, a first identity of the first source, the first type, and a time of the first change of power state, wherein logging the first identity includes saving the first identity within historical performance information stored in the non-volatile data storage; receiving, via the second interface from a second source of the plurality of sources, a second request to directly change the power state of the uninterruptible power supply; initiating, by the uninterruptible power supply, a second change of power state based on the second request, the second change of power state having a second type; changing, by the uninterruptible power supply, the uninterruptible power provided to the load in accord with the second change of power state; and logging, by the uninterruptible power supply, a second identity of the second source, the second type, and a time of the second change of power state, wherein logging the second identity includes saving the second identity within the historical performance information.