Growatt Esp32 Modbus Register 1037: Device name INV Power to Local Load Total

Technical Definition

The register device name INV Power to Local Load Total at address 1037 is used to monitor device name inv power to local load total on the Growatt Esp32.

• Protocol: Modbus RTU
• Data Type: U DWORD
• Unit: W
• 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 device_name INV Power to Local Load Total (Address: 1037)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=1037, 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: "device_name INV Power to Local Load Total"
  address: 1037
  value_type: U_DWORD
  unit_of_measurement: "W"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Growatt Esp32]

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

💡 Engineer's Insight

Analysis: Total inverter power supplied to local loads. Units: Watts (W).

Troubleshooting: Low or zero: Load demand is low, or inverter is not actively powering loads. Check connected loads and inverter operation.