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NASN Battery Rectifier Charger Has Midpoint Voltage Monitoring
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NASN Battery Rectifier Charger Has Midpoint Voltage Monitoring

Views: 0     Author: Site Editor     Publish Time: 2024-03-06      Origin: Site

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One bad cell or one bad battery can destroy a large, expensive battery bank.

A short circuit or high internal leakage current in one cell for example will result in undercharge of that cell and overcharge of the other cells. Similarly, one bad battery in a 24V or 48V bank of several series/parallel connected 12V batteries can destroy the whole bank.

Moreover, when new cells or batteries are connected in series, they should all have the same initial state of charge. Small differences will be ironed out during absorption or equalize charging, but large differences will result in damage during charging due to excessive gassing of the cells or batteries with the highest initial state of charge.

NASN rectifier power supply has a timely alarm, which can be generated by monitoring the midpoint of the battery bank (i.e. by splitting the string voltage in half and comparing the two string voltage halves).

The midpoint deviation will be small when the battery bank is at rest, and will increase:

  • At the end of the bulk phase during charging (the voltage of well charged cells will increase rapidly while lagging cells still need more charging).

  • When discharging the battery bank until the voltage of the weakest cells starts to decrease rapidly.

  • At high charge and discharge rates.

    batteries symmetry module

For example, one string of 4 batteries (12 V nominal each).

By measuring the voltage in the middle, this should be approximately 50% of the total voltage (nominally 48V, hence the middle point value should be 24V). If there is a difference, this is an alert that battery health is problematic.


In an unmonitored battery bank the midpoints should not be interconnected, one bad battery bank can go unnoticed and could damage all other batteries.

Always use busbars when applying midpoint voltage monitoring. The cables to the busbars must all have the same length.

Midpoints can only be connected if corrective action is taken in case of an alarm.






Midpoint voltage monitoring batteries symmetry module

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