Srne Modbus Register 271: Name battery maximum charging power current day

Technical Definition

The register name battery maximum charging power current day at address 271 is used to monitor name battery maximum charging power current day on the Srne.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: W
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read name_battery_maximum_charging_power_current_day (Address: 271)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=271, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "name_battery_maximum_charging_power_current_day"
  address: 271
  value_type: U_WORD
  unit_of_measurement: "W"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Srne]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Battery maximum charging power (Watts) recorded today. Highest power input to the battery.

Troubleshooting: Low values indicate limited charging capacity from the source or battery constraints.