Esp32 S3 Pv18 Usb Modbus Register 15209: PV Charger Radiator temp

Technical Definition

The register PV Charger Radiator temp at address 15209 is used to monitor pv charger radiator temp on the Esp32 S3 Pv18 Usb.

• Protocol: Modbus RTU
• Data Type: INT16
• Unit: °C
• 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 PV Charger Radiator temp (Address: 15209)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=15209, 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: "PV Charger Radiator temp"
  address: 15209
  value_type: INT16
  unit_of_measurement: "°C"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esp32 S3 Pv18 Usb]

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

💡 Engineer's Insight

Analysis: Monitors the Temperature of the PV charger's heatsink or critical components. Units: Degrees Celsius (°C).

Troubleshooting: A high or anomalous Temperature may indicate inadequate cooling, fan failure, or overload condition causing overheating.