Heatpump Modbus Register 154: Total heating renewable energy produced for system

Technical Definition

The register Total heating renewable energy produced for system at address 154 is used to monitor total heating renewable energy produced for system on the heatpump.

• Protocol: Modbus RTU
• Data Type: U DWORD
• Unit: kWh
• 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 Total heating renewable energy produced for system (Address: 154)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=154, 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: "Total heating renewable energy produced for system"
  address: 154
  value_type: U_DWORD
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

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

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

💡 Engineer's Insight

Analysis: Total cumulative renewable heating energy produced in kWh since reset. Tracks total heat from renewable sources.

Troubleshooting: Stuck at zero if renewable contribution is not accumulating, or no renewable energy is being utilized.