Power rectifier calculation for telecom equipment with battery backup?


Posted March 11th, 2010 by admin 3 Comments »
battery backup
Armughan asked:


I have two devices which need to be powered up by -48V DC power. One device has two components IDU and ODU (microwave equipment) the combined power consumption is 40.5 Watt(18.5+22), the second equipment has power consumption of 60Watt (multiplexer). The rectifier also has to charge the batteries for backup.

What will be the rating of the rectifier i should use? also if i need backup of 4 hours what will be the rating of the battery?
Also it will be very helpful if someone can recommend some book or pdf for better understand the power concepts.. like what if i have to make the same calculations for AC power..
Can you mention the required rectifier without battery backup.
If we take battery backup into calculations the backup time required will be 4 hours and recharge time will be 10 hours.

Charging more than one battery can overload the UPS?


Posted January 13th, 2009 by admin 1 Comment »
battery backup
The hoffed asked:


I have a normal 1000VA Line Interactive Power Center UPS. I’m thinking of adding more batteries (12V) in parallel to extend the backup time. Will extending too much (like five batteries) cause the UPS’s charging circuit to overload and burn or will it just increase the UPS’s power consumption.