Operating Instructions
January 8, 2021
BMS-1001-TH BMS
12
SYSTEM CONNECTION ARRANGEMENT
A site analysis should be performed when deploying a BMS system to ensure that all cells within a
baery bank are adequately monitored, and the input rang of each individual BMS is not exceed.
For example, the typical lead-acid baery bank used for generator start-up is comprised of 96 series-
connected cells with a nominal oat voltage of 2.70 VDC and an absolute minimum (discharged)
voltage of 1.80 VDC. To monitor the enre baery system, 10 BMS' are required:
1. 8 × BMS' are each connected to 10 cells (80 cells total). Each analog input will vary between 1.80
VDC and 2.70 VDC, and the total voltage applied to the BMS is between 18.00 VDC and 27.00 VDC.
2. 2 × BMS' are each connected to 8 cells (16 cells total). Each analog input will vary between 1.80
VDC and 2.70 VDC, and the total voltage applied to the BMS is between 14.40 VDC and 21.60 VDC.
Other wiring arrangements are possible. For assistance in determining the connecon scheme for a
parcular installaon, please contact Electronics4All.
In addion to serving as an analog input, baery cell connecons 0 and 10 are the main input power
connecons to the BMS. When less than 10 baery cells are connected to an individual BMS, the cells
should always be wired from boom (lowest potenal) to top (highest potenal), and the unconnected
cells inputs should be shorted to the highest potenal in the baery bank being monitored.
Connecons that serve as power inputs to the BMS should be protected by an external
circuit breaker or emergency disconnect switch. The circuit breaker or disconnect must
interrupt both conductors simultaneously, be suitably located and easily reached, and be
marked as the disconnecng means for the BMS.