Hardware Installation - 123electric Smart BMS gen 3 Manual

Hardware installation

Please be aware that your battery pack
contains a large amount of energy, which can
be potentially dangerous. Use isolated
spanners to prevent any short circuits. High
inrush currents, causing arcing (sparks) and
ultra-high electromagnetic levels, can easily
damage electronic circuits.
We therefore strongly recommend to always
FIRST connect the so called "large current
connections" in a new setup, and THEN
separately connect the BMS boards.
Step 1
Prepare the BMS boards by soldering a wire
on the battery minus solder pad (marked - )
Place a cable lug on the other end of the cable
to make a connection to the minus pole of the
battery. Please use at least wire of 0.75 mm2
to prevent a voltage drop.
If the positive (+) hole on the cell module is
too small, you can make this hole bigger with
a drill. Make sure to remove the drilling dust
afterwards to prevent short circuits or other
unintended behaviour.
Step 2
Prepare the battery pack. A good way of doing
this is indicated on step 2 image. Start
cleaning the cell poles, the copper strips and
cable lugs with sanding paper. Use threaded
rods instead of normal bolts. Don't forget to
also attach wires to the first and last cell in the
same way, and connect these to the solar
panels, MPPT, charger and the load.
123electric
The Netherlands
E-mail: info@123electric.eu
www.123electric.eu
Step 3
Mount the cell boards on the battery pack.
Make sure the Begin Board is mounted on
the minus side of the total battery pack. This
is the cell where the big (black) minus cable
leaves the battery pack. Make sure the End
Board is mounted on the plus side of the
battery pack. This is the cell where the big
(red) plus cable leaves the battery pack.
Step 4/5
After the Begin Board is connected correctly,
the LED will start blinking every second. This
shows the Begin Board is trying to send out
data to the following cell board. Start making
the interconnection of the Begin Board to the
following cell board. Make a connection from
the connector marked "OUT" on the Begin
Board to the connector marked "IN" on the
following cell board. It doesn't matter which
hole of the 2 pin connector you pick. Please be
careful while you're doing this, prevent short
circuits.
After you have made the interconnection
between the Begin Board and the first cell
board you will notice the green LED on the cell
board will flash as well every second. This
confirms the cell board is correctly installed
and the interconnection between the Boards
are made correct. Now go on with the other
cell boards. Make connections from the
double connector marked "OUT" to the next
cell board connector marked "IN". Be careful
when inserting the cable, do not use
excessive force. When the flashing LEDs stop
somewhere in the middle of the cell chain,
there is an error, in this case check the wiring.
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