Freedom LiTE Installation Manual Revision 14
P a g e
16 | 30
Freedom Won welcomes any requests to produce BMS CAN profiles for other inverters that
are CAN equipped for the BMS interface.
The CAN interface can provide the following functionality to compatible devices:
i.
Charge Current Limit of all LiTE
’s connected
ii.
Discharge Current Limit of all LiTE
’s
connected
iii.
Actual State of Charge (minimum of all lights connected)
iv.
Actual Battery Temperature (highest of all lights connected)
v.
Actual Voltage
vi.
Actual Current (total of all LiTE
’s connected)
vii.
Maximum real time charge voltage setpoint
viii.
Battery Name
ix.
Highest Cell Voltage of all LiTE
’s connected
x.
Lowest Cell Voltage of all LiTE
’s connected.
xi.
Firmware Version
xii.
Ah capacity of all batteries connected
xiii.
Advanced communication between all connected LiTEs
The CAN 2.0 Part A and Part B standard uses the SAE J1939 standard in the LiTE. It is
necessary to install a 120 Ohm resistor on each extreme end of the CAN cable (splices or
branches do not require a resistor). Most devices operating on CAN have two plugs to
connect in and then out again on the CAN Bus. The first and the last device in the chain must
have a termination resistor plugged into the spare (second) plug. The LiTE resistor plugs are
available from the inverter manufacturer and from Freedom Won. Ingeteam has a separate
CAN terminal block for bare wires to be inserted from the BMS and these units have an
internal resistor fitted into the device. From August 2018 all Freedom LiTE models have two
CAN plugs for parallel configurations (Figure 4.2) and allowing fitment of the termination
resistors on the end of line units. Where one LiTE is installed or where it is the end of line
CAN device,
the LiTE must be fitted with a termination resistor
.
The LiTE is supplied with a termination resistor as standard. The other devices must be fitted
with the correct termination resistor for that particular brand because the pin configuration
may differ from the battery plug.
The third-party device manuals must be referenced for all details regarding connecting the
CAN interface.
Most brands use 500kbps. If 250kbps is required it is available on the LiTE with a specific
profile loaded, which must be loaded during commissioning by your distributor or Freedom
Won technical support.
If you did not purchase a CAN Bus cable to suit your inverter you can make your own
according to Table 5.2. Fig 5.1 provides the standard colour coding for an Ethernet cable
(note that there are other variations so double check this).
