Sunsynk8.8 Esphome Modbus Register 108: Friendly name Daily PV Power (kWh)

Technical Definition

The register friendly name Daily PV Power (kWh) at address 108 is used to monitor friendly name daily pv power (kwh) on the Sunsynk8.8 Esphome.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: kWh
• 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 friendly_name Daily PV Power (kWh) (Address: 108)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=108, 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: "friendly_name Daily PV Power (kWh)"
  address: 108
  value_type: U_WORD
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Sunsynk8.8 Esphome]

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

💡 Engineer's Insight

Analysis: Daily energy generated by PV panels in kWh.

Troubleshooting: Zero if no sun or PV system issue, check panels and wiring.