Version: 2020-09-04
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TEL +49(40)22692910 - EMAIL generex@generex.de - WEB www.generex.de (This and all other product datasheets are available for download.)
Pause Equalization on schedule
For this configuration step, you need the following menu:
This hidden function is a little bit difficult to explain without basic information about the production process of a battery – please read the
following information carefully, it will explain you why this function is very powerfull and how set up the most effective configuration that
fits to your batteries …
Depending on the manufacturer and production process, AGM batteries require a few charge / discharge cycles to achieve the optimum
performance for a standby mode of a UPS. The number of chards / discharge cycles you need to form up your batteries is a technical
puzzler:
Basically, there are two different production methods for batteries:
Formed accumulators
As a post production process, formed accumulators were repeatedly charged and discharged. By doing so, the battery
chemistry itself will perform a so-called recombination. Caused by the entropy during the charge / discharge cycle, the
recombination of the battery chemistry will stabilize the internal resistance of the entire accumulator. As a side effect, the
accumulator's capacity will be maximized.
Unformed accumulators
These batteries are produced, packed and sold directly without any post production service. The entire forming process is a
part of the final installation on site. The forming process will be performed by the customer during first months of usage - as an
example, while running battery stress tests or by random power failures. In the end, these batteries will also reach full capacity
as well as a stabilized internal resistance, but it will take much longer than batteries that are formed before installation on site.
OK, but why does unformed accumulators exist?
There is no legal standard that dictates forming - accordingly, it is a service of battery manufacturers and is a quality feature of recently
produced batteries. As a consequence, it is up to the manufacturer how he wants to produce and sell his batteries:
While some manufacturer only supplies formed batteries as a quality standard, other manufacturer design two different product lines or
produce as cheap as possible.
Note
From a technical point of view, no differences can be observed between the formed and unformed batteries during commissioning - all
accumulators that have been assembled to a battery system have to perform such a formation process. The difference is that already
pre-formed accumulators can finish this process much faster. Please note, the "formation is finished" can only be seen when evaluating
the battery data collected by BACS.
In principle, BACS eliminates generally harmful voltage fluctuations.
As a result, formed batteries are spared and can be used over a very long time - sometimes even beyond the manufacturer's
specifications about the design life of a battery. However, if batteries are unformed at start-up, balancing or equalizing, especially in the
early days, could slow down the formation process enormously, because the accumulators need these voltage fluctuations.
Determining the optimal time from to hand over the equalization of your BACS system completely, depends, among other things, on the
basic operating mode:
Scenarios with a cyclic usage
In the case of cycling applications, formation takes place automatically as there is generally a regular charge / discharge cycle. This
means BACS can run immediately and your batteries will reach their maximum capacity very quickly.
Scenarios with a stand-by usage
In case of standby applications, the situation differs:
Because there is no cyclic discharge, the formation is carried out by natural voltage fluctuations of the UPS. As a consequence, a
system that mostly eliminates voltage fluctuations slows down the entire formation process.
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