Growatt Modbus Modbus Register 52: Solar Energy PV2 Today inverter

Technical Definition

The register Solar Energy PV2 Today inverter at address 52 is used to monitor solar energy pv2 today inverter on the Growatt Modbus.

• 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 Solar Energy PV2 Today inverter (Address: 52)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=52, 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: "Solar Energy PV2 Today inverter"
  address: 52
  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[Growatt Modbus]

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

💡 Engineer's Insight

Analysis: Energy generated by PV2 array today. Units: Wh (Watt-hours). Indicates daily solar harvest from the second string.

Troubleshooting: Zero indicates no solar generation or inverter issue. Check PV2 array, wiring, and inverter status.