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Getting this (attributes) /Dc/Battery/Soc /Yield/System /Ac/L1/Energy/Forward /Ac/L2/Energy/Forward /System/MinCellVoltage /System/MaxCellVoltage /System/MinCellTemperature /System/MaxCellTemperature /System/MinVoltageCellId /System/MaxVoltageCellId /System/MinTemperatureCellId /System/MaxTemperatureCellId needs more than 10 seconds. Is there a faster way to read out the current data from the Victron system?
The command line dbus calls do take a while but there is another call: dbus-send that takes far less time per call.
Look here:
https://github.com/victronenergy/venus/wiki/commandline---development
There is a faster alternative: modbustcp calls by pymodbus, see below.
Unfortunately, not all values readable via dbus are available, e.g. /Yield/System, and the values supplied via modbustcp, e.g. /System/MinCellVoltage:1290, are less precise.
Modified sample code from https://community.victronenergy.com/questions/190594/need-help-with-python-modbus-queery.html, tested with pymodbus-3.6.8 on Python 3.9.2, RaspberryPiCM4, CerboGX v3:
from pymodbus.constants import Endian
from pymodbus.client import ModbusTcpClient as ModbusClient
from pymodbus.payload import BinaryPayloadDecoder
BattID = 225
ip = "192.168.2.38"
client = ModbusClient(ip, port='502')
def modbus_register(address, slave):
msg = client.read_holding_registers(address, slave=slave)
decoder = BinaryPayloadDecoder.fromRegisters(msg.registers, byteorder=Endian.BIG)
msg = decoder.decode_16bit_int()
return msg
BatterySOC = modbus_register(266, BattID) / 10
print(f"BatterySOC {BatterySOC}")
