Freedom LiTE Installation Manual Revision 14
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4.3
Control Cables
–
Overview
For controlling external devices, you will need to connect the CAN Bus cable that allows the
Battery Management System inside the Freedom LiTE to control and interface with these
devices.
The CAN Bus connection is made using the RJ45 plug with the pin configuration on the
battery plug end provided in Table 5.1.
Table 5.1 Colour Coding and Pin Configuration for CAN Bus UTP Control Cable RJ45 Sockets
on the LiTE
RJ45 Pin No.
Standard Ethernet Cable Colours
Wire Function
Pin 1
Orange/White
Not connected
Pin 2
Orange
Not connected
Pin 3
Green/White
Not connected
Pin 4
Blue
Not connected
Pin 5
Blue/White
Not connected
Pin 6
Green
Not connected
Pin 7
Brown/White
CAN High
Pin 8
Brown
CAN Low
For Victron connections a standard LAN cable will work. For all other inverters a custom pin
configuration is required. For SMA inverters a special cable is required because of the
resistor required on the inverter end of the cable
–
please refer to the respective inverter
brands manuals for their pin configuration or contact Freedom Won for assistance. The
special SMA cable is available from Freedom Won.
4.4
CAN Bus Control
–
Detailed Description
CAN is a widely used communication protocol in systems with many devices that must
report their status or send commands to other devices on the same network. The Freedom
LiTE BMS can transmit messages and commands in CAN protocol to provide information to,
but more importantly to control, external devices. CAN allows great versatility and provides
a simple installation because there are only two wires required in this form of
communication, namely CAN High and CAN Low. In order for an inverter or charge
controller to be controlled by CAN it must first of all be equipped with a CAN interface as
well as a suitable method of connecting the CAN wires. Further to this the Freedom LiTE
BMS must be programmed with a CAN messaging profile that is developed for the inverter
or charge controller being used. This profile must be specifically developed for each inverter
model or model range. To date Freedom Won has developed CAN profiles for an extensive
list of inverter brands. Refer to the Freedom LiTE and eTower to Inverter Interfacing Guide
(
https://www.freedomwon.co.za/wp-content/uploads/Freedom-LiTE-eTower-Interfacing-
) for the complete list .