Huawei FusionSolar
SUN2000 inverters and LUNA2000 battery with SmartLogger KNX Modbus integration
Huawei FusionSolar (Shenzhen, China, founded 2000) is the world's largest solar inverter brand by shipment volume. SUN2000 residential (3-15 kW) and commercial (100-185 kW) inverters, combined with LUNA2000 battery and SmartLogger 3000A aggregator, represent Europe's fastest-growing solar ecosystem.
Role in our panels
How we use Huawei FusionSolar
The SmartLogger 3000A is the recommended integration point for KNX and third-party systems in Huawei FusionSolar installations. The SmartLogger aggregates up to 80 SUN2000 inverters, LUNA2000 batteries, and DTSU666 Smart Power Sensors on a single RS485 or MBUS network, then exposes a unified Modbus TCP interface on port 502 — eliminating the need to connect directly to individual inverter proprietary ports. A single Modbus TCP connection to the SmartLogger IP provides access to all connected devices in a multi-inverter plant. The SUN2000 inverter uses a proprietary Modbus TCP implementation on port 6607 (not SunSpec-compatible). Direct connection to a single SUN2000 on port 6607 is possible for small single-inverter residential installations, but the Huawei-recommended approach for any multi-inverter or complex system is via SmartLogger on port 502. Key registers via SmartLogger: Inverter 1 AC Power at register 32064 (unit W, scale factor 0.001 — divide by 1000 for kW), LUNA2000 battery SOC at register 37760 (unit 0.1%, divide by 10 for percent), DTSU666 grid power at register 37113 (W, scale 0.001, signed value). The DTSU666-H Smart Power Sensor (DIN rail, 3-phase) provides grid import/export measurement via RS485 to the SmartLogger. It supports both MeterBus (MBUS) and Modbus RTU protocols — select Modbus RTU when configuring in SmartLogger device list. The DTSU666 is a certified revenue-grade meter in many European countries, suitable for export limitation compliance and feed-in tariff metering alongside KNX energy monitoring. Intesis IN701KNX gateway configuration for Huawei via SmartLogger: connect to SmartLogger IP on port 502. Create three Modbus TCP signals — Inverter AC Power (Reg 32064, holding, uint32, ×0.001 W), LUNA2000 SOC (Reg 37760, holding, uint16, ×0.1 %), DTSU666 Grid Power (Reg 37113, holding, int32, ×0.001 W signed). Map to KNX GAs: GA 9/5/0 PV power DPT 9.001, GA 9/5/1 grid power signed DPT 9.001, GA 9/5/2 LUNA2000 SOC DPT 5.001. KNX surplus logic mirrors SMA/Fronius approach — export threshold triggers SG Ready heat pump State 3.
Huawei SUN2000 inverter uses proprietary Modbus TCP on port 6607 (not SunSpec). SmartLogger 3000A is the recommended integration point — it aggregates all SUN2000 inverters and LUNA2000 batteries and provides Modbus TCP on port 502. Key registers via SmartLogger: Inverter 1 AC Power (Reg 32064, W × 0.001), LUNA2000 SOC (Reg 37760, % × 0.1), DTSU666 Grid Power (Reg 37113, W × 0.001 signed). Intesis IN701KNX: three Modbus signals per source → KNX GAs: GA 9/5/0 PV power, GA 9/5/1 grid power, GA 9/5/2 LUNA2000 SOC. KNX surplus logic identical to Fronius/SMA approach.
Used in these project types
Huawei FusionSolar products
Key components we install
SUN2000-10K-M1
10 kW residential three-phase string inverter. Proprietary Modbus TCP on port 6607 for direct single-unit integration, or via SmartLogger for multi-unit plants. AFCI (arc fault detection) built-in. Compatible with LUNA2000 battery (DC-coupled). Supports up to 2 MPPTs. Smart IV curve diagnosis for string health monitoring. FusionSolar App commissioning (Bluetooth during install). Highest European market share 2023 in residential segment.
SUN2000-100KTL
100 kW commercial string inverter. 10 MPPT inputs (20 string inputs). SmartLogger 3000A mandatory for multi-unit integration and KNX gateway connectivity. Proprietary Modbus on port 6607 per unit — SmartLogger aggregates into port 502 interface. AFCI string protection. NEMA 4X / IP65. Suitable for commercial rooftop 500 kWp+ systems with SmartLogger-based energy management.
LUNA2000-10-S0
10 kWh modular LFP battery. DC-coupled to SUN2000 inverter — no separate AC inverter. Modular: add LUNA2000-5-E0 expansion units (5 kWh each, max 30 kWh per stack). SOC register 37760 via SmartLogger (unit 0.1%). BMS integrated — no external BMS gateway. 10-year warranty. Power output 5 kW continuous, 10 kW peak. FusionSolar App manages charge/discharge schedule and backup power settings.
SmartLogger 3000A
Modbus TCP aggregator for up to 80 SUN2000 inverters and associated devices (LUNA2000, DTSU666). LAN port provides Modbus TCP on port 502 — single IP address for all connected inverters. FusionSolar cloud connection via 4G/LAN. Local display with RS485 device list. Required for KNX gateway integration on any multi-inverter site. Also provides OPC UA server for SCADA integration. 4 RS485 ports (A/B/C/D), USB configuration port.
DTSU666-H
3-phase DIN rail grid power sensor for Huawei FusionSolar systems. Modbus RTU RS485 to SmartLogger. Signed grid power at Reg 37113 via SmartLogger (positive=import, negative=export). Revenue-grade accuracy class 0.5S. DIN rail 4 modules. 80-260V AC 3-phase. Used for export limitation, feed-in tariff metering, and KNX energy management grid power input.
Huawei FusionSolar FAQ
Which port does Huawei SUN2000 use for Modbus?
Port 6607 (proprietary) for direct connection, or port 502 via SmartLogger (recommended for KNX integration). Direct connection on port 6607 works for single-inverter residential installations but is not SunSpec-compatible and requires Huawei-specific register mapping. For any multi-inverter system or when using a KNX gateway, connect to SmartLogger on port 502 for the unified and more accessible Modbus TCP interface.
Can I read LUNA2000 battery data directly or via SmartLogger?
Via SmartLogger is recommended — it provides a unified Modbus interface for all connected devices. LUNA2000 connects to SUN2000 inverter via DC cable and communicates via proprietary bus — the battery SOC and power data are available in the inverter register map on port 6607, but are more reliably accessed via SmartLogger register 37760 (SOC). SmartLogger also exposes DTSU666 grid meter data in the same address space.
What is the LUNA2000 SOC register address via SmartLogger?
Reg 37760, unit 0.1% (divide by 10 for actual SOC percentage). For example, a register value of 750 = 75.0% SOC. This register is read from the SmartLogger Modbus TCP interface (port 502) — the SmartLogger reads LUNA2000 data from the connected SUN2000 inverter and exposes it in its unified register map. Confirm register addresses against the Huawei SmartLogger Modbus TCP Interface Definition document (available from Huawei FusionSolar portal).
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