Srne Modbus Register 280: Name total charging ah battery

Technical Definition

The register name total charging ah battery at address 280 is used to monitor name total charging ah battery on the Srne.

• Protocol: Modbus RTU
• Data Type: U DWORD
• Unit: AH
• 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_total_charging_ah_battery (Address: 280)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=280, 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_total_charging_ah_battery"
  address: 280
  value_type: U_DWORD
  unit_of_measurement: "AH"

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: Total charging Amp-hours (Ah) into the battery. Accumulates charge delivered to the battery.

Troubleshooting: Zero indicates no charging. Low values might suggest charging issues or low solar input.