Version: 2020-09-04
203
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Tutorial: BACS deactivated by System
With its management functions, BACS actively intervenes in the control process and thus guarantees the optimal charging conditions for
each individual battery within the according battery string.
The equalizing level is active for 3 of 4 battery strings. BACS manages each single batteries individually and adjusted them perfectly to
the target voltage. However, for the 4th battery string called "String 1 Neg", BACS displays that the equalizing functions was disabled for
some reason.
Why does BACS disable balancing?
BACS regularly checks whether there is an improvement in the voltage - by doing so,
balancing (equalizing) makes sense to the BACS WEBMANAGER, and he will continue
with balancing. With some operating conditions, however, it can always happen that BACS
would be able to manage the charging current individual to each battery in the battery
string, but not without permanent 100% balancing (equalization) and only without any
measurable improvements.
In addition to the classic that a battery simply becomes stubborn for literally inexplicable and
incomprehensible reasons, there are usually 3 scenarios in which BACS can conclude that
equalizing is theoretically possible, but practically examining the batteries should be:
1. New and old batteries or batteries from different manufacturers were mixed
Since BACS adjusts the charging currents individually to the needs of the battery through
balancing, a special feature of BACS is that individual batteries can in principle be
exchanged as you wish. If you decide to use another manufacturer, the performance data
and battery type can be similar, but the internal battery chemistry differs depending on the
grade and mixing ratio or how redox reaction runs during the charging process, etc. Finally,
this can lead into big differences between the stock batteries that simply cannot be
balanced over a long period of time – BACS will assume that exact this single battery will
never fit to the desired battery string.
2. Damaged batteries and wiring problems
While a hidden battery damage can appear again and again as an unpredictable factor, with
this warning message you should take another look at the batteries and the cabling,
especially after maintenance work. Even if the system itself could run without error
notification in its existing configuration, the values collected indicate that something is
fundamentally wrong, because at least one module is always running on 100%.
3. Old batteries
With ongoing aging, batteries will take over a very individual voltage, charging and capacity
behavior and drift apart - in this case, a core task of BACS is to intervene in the charging
cycle and thus create an individually optimized charging environment. As a consequence, the age of the batteries also increases the
intensity with which balancing has to be carried out.
When the batteries reach the calculated design life, it may become noticeable that BACS has run its balancing up to 100% for some
batteries within a battery string, but without any significant improvements. Although everything is set correctly, BACS will report this
information as “Equalizing deactivated by system” and pauses the equalizing accordingly.
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