Patent ID: 7199489

Claim:
A UPS system employing a back-up power system for supplying electrical power to a load when power from an AC power source is performing outside of acceptable limits or fails comprising, in combination a power control circuit, including a UPS processor, for coupling to an AC power source and to a back-up power system including one or more battery packs coupled together in parallel for supplying power to a load when an AC power source is performing outside acceptable limits or fails and a battery communication system including, in combination with the UPS processor, a plurality of battery pack monitors, one monitor being associated with one battery pack in the parallel coupled array of one or more battery packs, each monitor including a battery processor coupled to its associated battery pack for receiving, processing and storing battery pack information and a communication lead line coupled to the UPS processor and the monitor processors for transmission of battery pack information among the monitor processors and the UPS processor.