VRLA battery remote management system

NTT has used VRLA batteries as a backup power supply for over 17 years, and the use of VRLA batteries has reduced the battery maintenance cost. NTT Facilities must ensure that a reliable telecommunications power supply is maintained, and we need to be able to determine the degree of battery deterioration to prevent unexpected power failures. In addition, as our maintenance bases have been consolidated in recent years, maintenance workers are often no longer assigned to a particular site and they now have to maintain several types of equipment at different sites. Therefore, a remote management system for VRLA batteries has become necessary. We have developed a VRLA battery management system that automatically measures the voltage and ambient temperature of each cell and reports the appropriate time for battery replacement. These data can be monitored at an operating center located elsewhere. Furthermore, to help ensure a highly reliable telecommunications power supply, we have developed an electrolyte leakage detection function and an internal resistance measurement function. These functions have been added to the VRLA battery remote management system.