Garden-shed Modbus Register 12545: Human devicename PV Array Input Current

Technical Definition

The register human devicename PV Array Input Current at address 12545 is used to monitor human devicename pv array input current on the garden-shed.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: A
• 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 Current (Address: 12545)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=12545, 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 Current"
  address: 12545
  value_type: U_WORD
  unit_of_measurement: "A"

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: Current generated by the PV array. Units: A. Power availability from solar.

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