Version: 2020-09-04
157
Copyright of the European Union is effective (Copyright EU) (c) 2019 GENEREX Systems GmbH, Hamburg, Germany, All rights reserved
TEL +49(40)22692910 - EMAIL generex@generex.de - WEB www.generex.de (This and all other product datasheets are available for download.)
For larger cable lengths and installations, please take care for ...
- the maximum cable length including all modules must not exceed 50 m
- Do not install more than 50 modules per cable harness- If more than 50 batteries are in use, a plitting box is mandatory to split
the battery site into two different strangs.
- not exceeding the total number of 500 modules.
- installing the modules that the connection sockets are not live after connecting the cables.
- avoiding excess cable lengths
Note
keep an eye on logical cable sequences when connecting - BACS does not tell you how to connect all modules or in which order you
address the modules. For technical reasons, a network short circuit is not possible by placing rings within an installation. Structured
cabling and related documentation, however, facilitates system maintenance, especially when individual modules need to be replaced
within the installation.
Furthermore, if using a splitting box and set up several strings, a structured hardware configuration is mandatory to set up the BACS
configuration.
Tutorial: Montage von BACS BC Messkabeln mit Überwachung der Zellverbinder
What is the function of the cell connector
Depending on the type, there are plugged, crimped or screwed transition elements between the individual batteries to connect batteries
in series. Due to their function, these connecting elements represent critical areas within the battery system:
- Due to the series connection, the cell connectors pass on the charge and discharge current to the next cell, whereby very
large currents can arise depending on the size of the system.
- They are firmly connected to the battery poles and therefore also absorb thermal energy from passing current as well as the
heat generated by the redox reactions within the battery. Both the poles of a battery and the screw connections and
connecting elements between batteries are repeatedly exposed to mechanical and thermal loads. In this way, the thermal
energy can also be transferred directly from one battery to the neighboring batteries. The connecting elements here are
normally standardized components that can be neglected accordingly.
Why you should monitor the connecters between batteries?
If failures occur during installation or maintenance, such as torque values not adhered to (incorrectly tightened, over-tightened, etc.) or
the usasge of incorrectly dimensioned and damaged connecting elements, it can lead to system-critical failures and even a battery fire
within a few minutes. If you now only monitor the battery itself in addition to the general charging current, a problem with the connecting
elements between the batteries will not or can only be determined to a limited extent, e.g. due to unusual temperature developments or
deviating charging currents, etc.
While the temperature developments can still be localized, unclean currents are difficult to localize - it is difficult to narrow down exactly
which element causes this loss.
It may make sense in the highly critical system area to include the connection modules in the battery monitoring.
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