Felicity Solar Lithium Batteries BMS Protocol Definition using python

[irmajavi]

Hello everyone, I would like to access to BMS of a Felicity Solar battery using python. Attached is the protocol definition.
If anyone can help me with the code. This is what I got so far:

import serial
import time

serial_port = "/dev/ttyUSB0"
serial_baud = 9600
full_command = bytes.fromhex("01 03 f8 0b 00 01 c4 a8")
response_line = None

print(full_command)
print(f"port {serial_port}, baudrate {serial_baud}")
try:
with serial.serial_for_url(serial_port, serial_baud) as s:
print("Executing command via serialio...")
s.timeout = 1
s.write_timeout = 1
s.flushInput()
s.flushOutput()
s.write(full_command)
#s.write(full_command+'\r')
time.sleep(0.1) # give serial port time to receive the data
response_line = s.read_until(b"\r")
print("serial response was: %s", response_line)
return response_line
except Exception as e:
print(f"Serial read error: {e}")
print("Command execution failed")

The only response I get is b' '.

Any suggestions?

 

[Ingtarek]

I think you could Try to use serial monitor software to debug the communication between edms (felicity software) and battery. Maybe it will help you

 

[steve45]

Where did you get this protocol definition from? Does it apply the all felicity battery types?

 

[steve45]

I actually tried it myself on my felicity 12,5 kWh and it works. You need to check for the "slave id", the examples in the PDF are all assuming slave id = 1 and this must match with the dip switch setting of the battery, otherwise you wont get a response.

 

[irmajavi]

Did you used the code that i post earlier?