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Battery management system

Battery management system

UPS battery rack

As a provider of UPS, we get a lot of requests for our data sheets. These documents are key to understanding the specification of a UPS and the work that it can do, but if you are a new purchaser of UPS you may not have heard some of the terms before.
In the latest post in our series on this blog, we’re looking at what a battery management system does.

Most UPS sold utilise batteries to store the necessary electrical energy that they need to discharge in order to support the load in the event of a power cut. Whilst the UPS can’t control the temperature or humidity the batteries are stored at, they can control the voltage flowing to the batteries and ensure that they are always at their optimum charge.

The primary job of a battery management system is balancing the voltage fed to each battery cell. A battery is not just one uniform unit, it is comprised of several cells, which are then arranged into a string in order to make up the required voltage for the UPS. In some instances multiple strings will be required to increase the capacity. With this many individual parts being pieced together, it is imperative that the work is spread across them evenly and this is what the battery management system within a UPS does. It spreads the voltage fairly across all of these elements.

Common problems which are solved by having a battery management system in place include undercharge and overcharge. Undercharge means that the battery isn’t storing as much power as it can which means that the autonomy time would be reduced should the battery be called upon. Overcharge is bad for your batteries as it puts more power into them than they can handle which has a negative effect on the overall life of your units.
Batteries can sometimes be viewed as a necessary evil when purchasing a UPS, but buying a UPS which has an integrated battery management system can prevent some common problems for occurring. 

Author: Petya Petrova

18/09/2014 10:55:00
Listed in : Explaining Critical Power  
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