Garden-shed Modbus Register 12546: Human devicename PV Array Input Power

Technical Definition

The register human devicename PV Array Input Power at address 12546 is used to monitor human devicename pv array input power on the garden-shed.

• Protocol: Modbus RTU
• Data Type: U DWORD R
• 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 human_devicename PV Array Input Power (Address: 12546)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=12546, 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: "human_devicename PV Array Input Power"
  address: 12546
  value_type: U_DWORD_R
  unit_of_measurement: "W"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[garden-shed]

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

💡 Engineer's Insight

Analysis: Power output from the PV array. Units: W. Total energy being generated by solar.

Troubleshooting: Low sun, shading, panel fault, or MPPT/charge controller performance issue.