Device Growatt Spf Modbus Register 27: Name inverter name ac out load percent

Technical Definition

The register name inverter name ac out load percent at address 27 is used to monitor name inverter name ac out load percent 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_ac_out_load_percent (Address: 27)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=27, 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_ac_out_load_percent"
  address: 27
  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: AC output load percentage (%). Percentage of maximum rated output power being used.

Troubleshooting: 100% indicates maximum load. Higher demands may cause inverter shutdown or reduce output. Monitor load vs. capacity.