Esp8266 Config Modbus Register 11003: Inverter name PV2 Voltage

Technical Definition

The register inverter name PV2 Voltage at address 11003 is used to monitor inverter name pv2 voltage on the Esp8266 Config.

• Protocol: Modbus RTU
• Data Type: S WORD
• Unit: V
• 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 inverter_name PV2 Voltage (Address: 11003)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=11003, 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: "inverter_name PV2 Voltage"
  address: 11003
  value_type: S_WORD
  unit_of_measurement: "V"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp8266 Config]

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

💡 Engineer's Insight

Analysis: Displays the voltage from the second photovoltaic string connected to the inverter. Units: Volts (V). Monitors secondary solar input.

Troubleshooting: Inspect PV2 wiring, panel condition, and string connections. Zero value suggests issues similar to PV1, but specific to this string.