I have started to explore the BMS CAN bus on my Smile B3. I'm using SocketCAN with a baud rate of 250000 and have made some progress. I have noticed the cell voltages for the single 2.9KWh battery I have:
`import can
import time
bus = can.Bus(channel='can0', interface='socketcan')
while True:
message = bus.recv()
if (message.arbitration_id == 0x181E17F3):
print(hex(message.arbitration_id))
print("Cell X: " + str(((message.data[1] & 0xFF) << 8)|(message.data[2])) + " mV")
print("Cell Y: " + str(((message.data[3] & 0xFF) << 8)|(message.data[4])) + " mV")
print("Cell Z: " + str(((message.data[5] & 0xFF) << 8)|(message.data[6])) + " mV")
if (message.arbitration_id == 0x182417F3):
print(hex(message.arbitration_id))
print("Cell 0: " + str(((message.data[1] & 0xFF) << 8)|(message.data[2])) + " mV")
print("Cell 1: " + str(((message.data[3] & 0xFF) << 8)|(message.data[4])) + " mV")
print("Cell 2: " + str(((message.data[5] & 0xFF) << 8)|(message.data[6])) + " mV")
if (message.arbitration_id == 0x182517F3):
print(hex(message.arbitration_id))
print("Cell 3: " + str(((message.data[1] & 0xFF) << 8)|(message.data[2])) + " mV")
print("Cell 4: " + str(((message.data[3] & 0xFF) << 8)|(message.data[4])) + " mV")
print("Cell 5: " + str(((message.data[5] & 0xFF) << 8)|(message.data[6])) + " mV")
if (message.arbitration_id == 0x182617F3):
print(hex(message.arbitration_id))
print("Cell 6: " + str(((message.data[1] & 0xFF) << 8)|(message.data[2])) + " mV")
print("Cell 7: " + str(((message.data[3] & 0xFF) << 8)|(message.data[4])) + " mV")
print("Cell 8: " + str(((message.data[5] & 0xFF) << 8)|(message.data[6])) + " mV")
if (message.arbitration_id == 0x182717F3):
print(hex(message.arbitration_id))
print("Cell 9: " + str(((message.data[1] & 0xFF) << 8)|(message.data[2])) + " mV")
print("Cell 10: " + str(((message.data[3] & 0xFF) << 8)|(message.data[4])) + " mV")
print("Cell 11: " + str(((message.data[5] & 0xFF) << 8)|(message.data[6])) + " mV")
if (message.arbitration_id == 0x182817F3):
print(hex(message.arbitration_id))
print("Cell 12: " + str(((message.data[1] & 0xFF) << 8)|(message.data[2])) + " mV")
print("Cell 13: " + str(((message.data[3] & 0xFF) << 8)|(message.data[4])) + " mV")
print("Cell 14: " + str(((message.data[5] & 0xFF) << 8)|(message.data[6])) + " mV")
if (message.arbitration_id == 0x182917F3):
print(hex(message.arbitration_id))
print("Cell 15: " + str(((message.data[1] & 0xFF) << 8)|(message.data[2])) + " mV")
`
It seems the CAN bus may have additional information that is not available over the Modbus. Has anyone one else looked into this? Smile B3 batteries seem hard to acquire so I'm considering writing a BMS bridge to use readily available batteries.
Apologies again for posting it as an issue rather than discussion.
I have started to explore the BMS CAN bus on my Smile B3. I'm using SocketCAN with a baud rate of 250000 and have made some progress. I have noticed the cell voltages for the single 2.9KWh battery I have:
`import can
import time
bus = can.Bus(channel='can0', interface='socketcan')
while True:
message = bus.recv()
`
It seems the CAN bus may have additional information that is not available over the Modbus. Has anyone one else looked into this? Smile B3 batteries seem hard to acquire so I'm considering writing a BMS bridge to use readily available batteries.
Apologies again for posting it as an issue rather than discussion.