Esp8266 Config Modbus Register 11008: Inverter name Battery Discharge Power

Technical Definition

The register inverter name Battery Discharge Power at address 11008 is used to monitor inverter name battery discharge power on the Esp8266 Config.

• Protocol: Modbus RTU
• Data Type: S WORD
• Unit: kW
• 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 Battery Discharge Power (Address: 11008)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=11008, 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 Battery Discharge Power"
  address: 11008
  value_type: S_WORD
  unit_of_measurement: "kW"

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: Indicates the rate at which the battery is supplying or consuming energy. Units: Watts (W). Positive indicates discharge, negative indicates charge.

Troubleshooting: Zero may mean battery idle, protection active, or communication error. Verify battery state and inverter operation.