ZTT BMS

[Intrerio]

Hello friends. Maybe somebody can help me to make driver for my BMS cause I don't know what to do with my batteries:
ZTT BMS Modbus Protocol for RS485 V1.1(2019-01-23).pdf
I added communication protocol for my batteries

[Intrerio]

Can somebody help me with this?

[hieu09888]

Can you give me the bms ztt communication software, thank you

[gllajaruna]

Hi, i very interest in can communication betwen inverter and bateries ztt lifepo4, please your help, Thanks

[dumtux]

I also bought ZTT48100B battery.
I don't have full ZTT system, I just bought their battery and an inverter from LinkData.
They are working well together without any RS485 connection between.

However, it would be interesting if I can read the serial messages from the battery and display it on a small LCD screen using Arduino or RPi.
I could not find any Python or Arduino libs in public yet.

Isn't there really no similar work done yet?
Or should I write the lib by myself?

[gllajaruna]

thanks for your help, keep looking

[dumtux]

thanks for your help, keep looking

If I write some Python code for ZTT BMS reading, can you test it?
Because I'm currently working far from home, where my ZTT batteries are installed.
I won't be able to go back till the CNY comes.
But I have enough time to write codes for it here.

[dumtux]

I added ZTT BMS to the wishlist.
The more upvotes, the more chance that we ZTT users can get it implemented here.

[mr-manuel]

You linked the wrong discussion. This is the correct place to upvote,

[dumtux]

You linked the wrong discussion. This is the correct place to upvote,

I got it. Thank you!

[Intrerio]

Is somebody tried to compare ZTT with Victron? Problem still actual

[Intrerio]

I tried to write a little code but I can't understand what I need to write in the block send_data_to_victron. Maybe somebody can finish and test my work

from pymodbus.client.sync import ModbusSerialClient as ModbusClient
from pymodbus.payload import BinaryPayloadDecoder
from pymodbus.constants import Endian

class ZTTBattery:
    def __init__(self, port, slave_address):
        self.client = ModbusClient(method='rtu', port=port, baudrate=9600, timeout=1, parity='N', stopbits=1, bytesize=8)
        self.slave_address = slave_address
        self.client.connect()

    def read_registers(self):
        data = {}
        data['current'] = self.read_signed_16bit(0x0000) * 10  # mA
        data['voltage'] = self.read_unsigned_16bit(0x0001) * 10  # mV
        data['soc'] = self.read_unsigned_8bit(0x0002)  # %
        data['soh'] = self.read_unsigned_8bit(0x0003)  # %
        data['remain_capacity'] = self.read_unsigned_16bit(0x0004) * 10  # mAh
        data['full_capacity'] = self.read_unsigned_16bit(0x0005) * 10  # mAh
        data['battery_cycle_counts'] = self.read_unsigned_16bit(0x0007)  # cycles
        data['warning_flag'] = self.read_unsigned_16bit(0x0009)  # Hex
        data['protection_flag'] = self.read_unsigned_16bit(0x0010)  # Hex
        data['status_fault_flag'] = self.read_unsigned_16bit(0x0011)  # Hex
        data['balance_status'] = self.read_unsigned_16bit(0x0012)  # Hex

        # Читання напруги по комірках
        cell_voltages = []
        for i in range(0x0015, 0x002F, 2):
            cell_voltages.append(self.read_unsigned_16bit(i) * 10)  # mV
        data['cell_voltages'] = cell_voltages

        # Читання температури по комірках
        cell_temperatures = []
        for i in range(0x0031, 0x0035, 2):
            cell_temperatures.append(self.read_signed_16bit(i) * 0.1)  # °C
        data['cell_temperatures'] = cell_temperatures

        # Додаткові параметри
        data['mosfet_temperature'] = self.read_signed_16bit(0x0035) * 0.1  # °C
        data['environment_temperature'] = self.read_signed_16bit(0x0036) * 0.1  # °C
        data['max_cell_temperature'] = self.read_signed_16bit(0x0037) * 0.1  # °C
        data['min_cell_temperature'] = self.read_signed_16bit(0x0038) * 0.1  # °C

        return data

    def read_signed_16bit(self, address):
        result = self.client.read_holding_registers(address, 1, unit=self.slave_address)
        if not result.isError():
            decoder = BinaryPayloadDecoder.fromRegisters(result.registers, Endian.Big)
            return decoder.decode_16bit_int()
        else:
            raise Exception(f"Error reading signed 16-bit register at address {address}")

    def read_unsigned_16bit(self, address):
        result = self.client.read_holding_registers(address, 1, unit=self.slave_address)
        if not result.isError():
            decoder = BinaryPayloadDecoder.fromRegisters(result.registers, Endian.Big)
            return decoder.decode_16bit_uint()
        else:
            raise Exception(f"Error reading unsigned 16-bit register at address {address}")

    def read_unsigned_8bit(self, address):
        result = self.client.read_holding_registers(address, 1, unit=self.slave_address)
        if not result.isError():
            decoder = BinaryPayloadDecoder.fromRegisters(result.registers, Endian.Big)
            return decoder.decode_8bit_uint()
        else:
            raise Exception(f"Error reading unsigned 8-bit register at address {address}")

    def send_data_to_victron(self, data):
        # HERE #
        pass

    def close(self):
        self.client.close()

if __name__ == "__main__":
    ztt_battery = ZTTBattery('/dev/ttyUSB0', 1) 
    try:
        data = ztt_battery.read_registers()
        print(data)
        ztt_battery.send_data_to_victron(data)
    finally:
        ztt_battery.close()

[mr-manuel]

If you want to create a new driver on your own this will help you:

https://mr-manuel.github.io/venus-os_dbus-serialbattery_docs/general/supported-bms#add-by-opening-a-pull-request