2 INSTALLATION GUIDE
2.3 DC Cable Size Requirements
WARNING
Cable and fuse sizes are specifi ed by various codes and standards which depend
on the type of vehicle the unit is installed into. Selecting the wrong cable or fuse
size could result in harm to the installer or user and/or damage to the BMS or
other equipment installed in the system. The installer is responsible for ensuring
that the correct cable and fuse sizes are used when installing this device.
Input Wire Diameter Selection
The BMS is capable of drawing up to 30A from the vehicle battery, which may
be several metres from its installation location. The installer needs to ensure the
appropriate cable is used to connect the positive and negative connections of the
BMS to the vehicle battery. While the BMS will operate with less effi cient cabling,
for best performance, high-quality cable connections should be used to minimise
voltage drop and effi ciency losses.
Redarc recommends the installer use cabling and connections between 6mm
and 6B&S automotive. The recommended maximum cable length between input
vehicle battery and the BMS should not be longer than 10m for 6mm auto or 20m
for 6B&S.
Redarc recommends that the input wire be of the size outlined in Table 2.3.1.
Distance (metres)
from source battery to
BMS1215S2
Recommended Cross
Sectional Area
(mm²)
Recommended
Diameter
Equivalent
1 4 6mm auto
2 6 8 B&S
3 8 6 B&S
4 12 6 B&S
5+ 16 6 B&S
Figure 2.3.1 - Recommended cable sizes
for safe cable heating and effi ciency
losses
16
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