Patent ID: 7132833
Filing Date: 2006-11-07
Classification: H01M,H02J,Y02E

Abstract:
1. A non-invasive method of monitoring operational readiness of electric power storage batteries in an uninterruptible power supply (UPS) system, the UPS system having at least one battery channel, each having at least two battery packs coupled in series to supply output power to a connected load and a battery charger to maintain and restore charge to the batteries during normal utility line operation, comprising the steps of: monitoring a voltage at a midpoint between the two battery packs during a quiescent state of operation of the battery packs; comparing the voltage to a first nominal value for the midpoint voltage during the quiescent state of operation of the battery packs; indicating a lack of operational readiness of both battery packs when the voltage at the midpoint is less than the first nominal value by a first predetermined amount.