Felicity Speicher Modbus Register 4875: Bat2 SOC

Technical Definition

The register Bat2 SOC at address 4875 is used to monitor bat2 soc on the Felicity Speicher.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: %
• 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 Bat2 SOC (Address: 4875)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4875, 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: "Bat2 SOC"
  address: 4875
  value_type: U_WORD
  unit_of_measurement: "%"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Felicity Speicher]

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

💡 Engineer's Insight

Analysis: State of Charge (SOC) for Battery 2. Units: Percentage (%).

Troubleshooting: Could indicate a discharged battery, faulty sensor, or communication issue.