Device Growatt Spf Modbus Register 48: Name inverter name pv energy today

Technical Definition

The register name inverter name pv energy today at address 48 is used to monitor name inverter name pv energy today on the Device Growatt Spf.

• 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 name_inverter_name_pv_energy_today (Address: 48)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=48, 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_pv_energy_today"
  address: 48
  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[Device Growatt Spf]

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

💡 Engineer's Insight

Analysis: PV energy generated today in Kilowatt-hours (kWh). Cumulative solar energy produced since midnight.

Troubleshooting: Zero at midnight or if PV production is absent. Check PV input and inverter operation throughout the day.