HUAWEI SUN2000 Inverter & LUNA2000 battery

Installation

1. 1Update the SUN2000 inverter to firmware SPC123 or newer. On SPC124+, open the FusionSolar app and enable Modbus TCP on the dongle settings page.
2. 2Connect the SmartDongle WiFi/FE to the same local network as your ModbusCloud gateway. Note its IP address or configure a DHCP reservation.
3. 3In ModbusCloud, add a new device with protocol Modbus TCP, pointing at the dongle IP on port 502 and slave ID 1 (inverter 1).
4. 4Import the HUAWEI SUN2000 template into the device. Readings appear within 30 seconds.
5. 5For multi-inverter setups, repeat for slave IDs 2, 3, ... up to the number of inverters behind the dongle.

Things to watch for

01

Why do I get read errors when my polling interval is faster than 5 seconds?

The SmartDongle WiFi/FE is rate limited by HUAWEI. Any interval below 5 seconds triggers dropped packets or error responses. Keep ModbusCloud polling at 5 seconds or higher, which is the default for this template.

02

I can reach the dongle by ping but Modbus requests time out. What should I check?

On SPC124 and newer firmware, Modbus TCP is disabled by default. Open FusionSolar app, go to Commissioning, and enable Modbus TCP under the dongle settings. The port will open after a short reboot.

03

Which slave ID do I use for the battery and power sensor?

They share the slave ID of the inverter they are connected to. For a single inverter install, everything is on slave ID 1. The template maps dongle, inverter, battery, and sensor registers all at that address.

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