tbs electronics Expert Modular, Owner'S Manual

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The reason for this is that through the interconnected midpoints, one bad battery in a series string
can damage all other batteries if not being monitored correctly. However, when decent midpoint
voltage measurement has been applied and an alarm is triggered when the voltage difference is too
large, the midpoints of the series strings are allowed to be interconnected. This will result in the
following connection diagrams:
The above images are also indicating that busbars are being used to respectively join all positive and
all negative battery cables. Besides this, all positive and negative battery cables that are wired to
these busbars need to be of equal length. These precautions are made to avoid any imbalance
between the different series strings, to ultimately improve the overall accuracy of the midpoint
voltage measurement.