Powmr Inverter 1 Modbus Register 57861: Inverter Grid Maximum Charging Current

Technical Definition

The register Inverter Grid Maximum Charging Current at address 57861 is used to monitor inverter grid maximum charging current on the Powmr Inverter 1.

• Protocol: Modbus RTU
• Data Type: INT16
• 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 Inverter Grid Maximum Charging Current (Address: 57861)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=57861, 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 Grid Maximum Charging Current"
  address: 57861
  value_type: INT16
  unit_of_measurement: "A"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Powmr Inverter 1]

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

💡 Engineer's Insight

Analysis: Sets the maximum current allowed for charging from the grid. Units: Amperes (A).

Troubleshooting: Zero indicates grid charging is disabled or a configuration error.