14
123electric
The Netherlands
E-mail: [email protected]
www.123electric.eu
Option switch nr 1 - 3: Please set the number
of cells of your battery pack. See table for
details.
Option switch nr 4 - 8: Set option switch 4 - 8
in the right positions for the balance threshold
voltage you like. Above this voltage, the cell
board starts balancing. See table for details.
For balance voltage explanation read the text
below.
Keep the batteries in perfect condition
The drawing below shows that your expensive
batteries are in safe hands with
123\SmartBMS gen3.
To keep batteries in the best condition, it is
necessary to constantly monitor the voltage
and temperature of individual cells. The
voltage should stay within specified limits to
prevent damage to the cells. Keeping the
batteries in a safe operating temperature also
prevents possible damage.
The width of the green (safe) area can be set
by changing the threshold voltages V-min, V-
balance and V-max. For more info about this,
see section “The App”.
Conclusion: the upper limit is safe-guarded by
entering V-max / V-balance, and the lower
limit by V-min.
A LiFePO4 cell voltage vs. SOC curve. The voltage is dependent on the percentage energy left in the cell (SOC).
Recommended threshold values for different cell chemistries
Cell chemistry
Minimum voltage
(Vmin)
Balance voltage
(Vbalance)
Maximum voltage
(Vmax)
LiFePO4
2.9V
3.4V
3.7V
LTO
2.15V
2.6V
2.7V
NMC
3.43V
4.0V
4.1V
Li-ion
3.43V
4.1V
4.15V
