Battery Management System (Bms) - Victron energy LFP-Smart 12,8/60 Manual

Parallel connecting the batteries and simultaneous charging is also possible.
In this case every battery must be protected by a fuse and the recommended
charge rate is again C/20 or less, with C being the capacity of one of the
paralleled batteries.
4 Operation
4.1 Cell balancing and alarms
Each 12,8V battery consists of four series connected cells, and the internal
cell balancing system will:
a) Measure the voltage of each cell and move Ah from cells with the
highest voltage to cells with a lower voltage until the voltage
difference between cells is less than 10mV (active balancing).
b) Give an over voltage (cell voltage > 3,7V) or under voltage (cell
voltage < 2,8V) alarm to be processed by the BMS.
c) Give an over temperature (T > 50°C) alarm to be processed by the
BMS.
Note:
The cells within a battery or series connected batteries may become
unbalanced due to high discharge currents and short float charge periods.
The available battery capacity will be reduced, and a cell overvoltage alarm
may occur.
Apply the procedures as described in section 3.2 to fully charge and balance
the batteries.
4.2 Charge voltage
Recommended charge voltage: 14V-14,4V per battery (14,2V recommended),
respectively 28V-28,8V (28,4V recommended.
Absorption time: 2 hrs for a 100% charge, or a few minutes for a 98% charge.
Maximum charge voltage: 14,4V resp. 28,8V per battery.
Recommended storage/float voltage: 13,5V resp. 27V per battery.
Batteries must be regularly (at least once every month) charged to 14V (max.
14,4V) in order to fully balance the cells. Two or four batteries in series should
be charged regularly to 28V resp. 56V.

4.3 Battery Management System (BMS)

Two BMS's are available to process the information from the batteries.
4.3.1 BMS 12/200
The BMS 12/200 is a simple all-in-one solution intended for 12V systems only.
It includes all functions as described under section 4.1, plus an alternator
current limiter.
For details, please see the datasheet and manual on our website.
4.3.2 VE.Bus BMS
This BMS is suitable for 12, 24 and 48V systems.
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