Patent ID: 7566989

Claim:
A dedicated back-up power source providing alternating current (AC) to a cooling system, the dedicated back-up power source comprising: a source of direct current (DC) for supplying the DC to a DC bus; the DC bus coupled to the source of DC for passing the DC to an inverter; the inverter, coupled to the DC bus, for powering the cooling system by converting said DC to AC; a transfer switch capable of switching between the primary power source and the dedicated back-up power source, wherein the transfer switch is initially positioned to couple a primary AC utility to the cooling system, and wherein the transfer switch is alternatively positioned to couple the source of DC exclusively to the cooling system upon reaching the predetermined operating limits, and wherein reaching the predetermined operating limits comprises ascertaining that an operating temperature of telecommunications equipment being cooled by the cooling system is exceeding an acceptable temperature range and ascertaining that the primary AC utility is unavailable.