Device Growatt Spf Modbus Register 82: Name inverter name inverter fan speed

Technical Definition

The register name inverter name inverter fan speed at address 82 is used to monitor name inverter name inverter fan speed on the Device Growatt Spf.

• 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 name_inverter_name_inverter_fan_speed (Address: 82)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=82, 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_inverter_name_inverter_fan_speed"
  address: 82
  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[Device Growatt Spf]

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

💡 Engineer's Insight

Analysis: Inverter fan speed. Units: RPM. Reflects the cooling demand and operational status of the inverter's cooling system.

Troubleshooting: Low/zero speed suggests fan malfunction, blockage, or a thermal management issue. Verify fan motor and airflow.