Specifications

Power Supplies

BACS

Fig. 1: In series connected and charged batteries have different ca-

pacity because of different conditions. As a result of natural ageing,

these batteries already have different charge statuses after only a

short period of use due to internal chemical processes.

Fig. 2: Standard charging of the batteries using traditional methods

causes overcharging or deep discharging and damage to individual

batteries, which in turn compromises the reliability of the entire

system.

Traditionally, batteries in all common UPS systems have

been connected and charged in series. The voltage

present at the batteries is monitored. This is normally

approx. 12-13V or a multiple thereof in accordance with

the battery voltage. In this way, it is possible to measure

whether the necessary voltage to supply the required

battery capacity is available. EFFEKTA

’s BACS is

working more accurately:

How BACS works and its benets in comparison to

conventional battery-management-systems:

1. Each battery is individually monitored via a dedicated

processor-controlled “RTV” module. This also enables

defective batteries on a system to be identied.

This elimiates one important weak spot of conventional

systems: Even defective or discharged batteries can

supply the required 12-13V for a short period, which

often causes the incorrect assumption in battery

management terms that the battery status is OK. This

leads to an excessively rapid discharge in the case of

a power failure. Not so with BACS because weak or

defective batteries are reported on time.

2. The user is informed of defective or weak batteries

BEFORE any potential damage occurs.

In conventional systems the capacity of the battery/

batteries is actually depleted, although the display (LED

chain, LCD display or software) states otherwise. (s.

item 1.) The safety of a UPS system is thus no longer

guaranteed. The necessary autonomous time for a

secure shutdown may not be available, which would

result in the uncontrolled crash of all consumers.

The BACS benets: