Huawei Sun + Luna2000 + DTSU666-H

Use cases

• Shift battery charging to low-tariff hours using dynamic pricing data and write setpoints through ModbusCloud automations.
• Track grid import and export separately for feed-in tariff reporting and net metering verification.
• Monitor battery state of charge and cell temperatures to catch cell imbalance or thermal issues early.
• Build a landlord dashboard showing PV yield, battery activity, and grid interaction per tenant installation.
• Enable or disable battery AC charging remotely when the installer needs to troubleshoot or run tests.

Installation

1. 1Confirm firmware versions: inverter V100R001C00SPC148 or newer, dongle SPC130 or newer, battery SPC116 or newer. Older firmware lacks the control registers.
2. 2Connect the SmartDongle WiFi/FE to the local network via LAN cable (WiFi also works but LAN is more stable for control use cases).
3. 3Enable Modbus TCP in the FusionSolar app under the dongle settings. On SPC148+ this is already on by default.
4. 4Add a Modbus TCP device in ModbusCloud at the dongle IP, port 502, slave ID 1, and import this template.
5. 5Increase the ModbusCloud query interval one step at a time if timeouts occur, starting at 5s and working up to 10s only if needed.

Things to watch for

Registers (25)

22 read / 5 write

More Huawei templates

HUAWEI SUN2000 Inverter & LUNA2000 battery

Huawei

Modbus TCP

Monitors HUAWEI SUN2000 inverter, LUNA2000 battery, and Smart Power Sensor via Modbus TCP.

4 registers1248

More TCP templates

Fronius - Modbus TCP

Fronius

Modbus TCP

Monitors Fronius Symo and Primo inverters via Modbus TCP

15 registers597

Domekt R 400 V

Komfovent

Modbus TCP

Controls Komfovent Domekt recuperator ventilation via Modbus TCP

25 registers118

E+E Elektronik EE650 - Air Flow Sensor for HVAC

E+E Elektronik

Modbus TCP

Measures air flow velocity and temperature for HVAC applications.

2 registers9

HomeWizard Wi-Fi kWh meter 3-phase

HomeWizard

Modbus TCP

Reads HomeWizard Wi-Fi kWh meter 3-phase energy data via local API

0 registers2

Kostal Modbus-TCP and Battery

Kostal

Modbus TCP

Reads energy yield, consumption, and battery data from Kostal inverters via Modbus TCP.

12 registers325

Windhager Best Heating Technology Pellet Boiler

Windhager

Modbus TCP

Monitors and controls Windhager pellet boiler heating systems via Modbus TCP.

40 registers5