Solis Modbus Esinv Modbus Register 33049: DC voltage 1

Technical Definition

The register DC voltage 1 at address 33049 is used to monitor dc voltage 1 on the Solis Modbus Esinv.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: V
• 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 DC voltage 1 (Address: 33049)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=33049, 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: "DC voltage 1"
  address: 33049
  value_type: U_WORD
  unit_of_measurement: "V"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Solis Modbus Esinv]

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

💡 Engineer's Insight

Analysis: DC voltage from the first solar array in Volts. Input voltage from PV string 1.

Troubleshooting: Zero: No sunlight, open circuit, or faulty panel. Low: Shading, incorrect wiring, or degraded panels.