HUAWEI - SmartAssistant-A02 (SA4H-A02) - Eligible for 5.5% VAT

The Huawei Smart Assistant (formerly known as EMMA-A02) is an intelligent load manager that coordinates photovoltaic production, battery storage (ESS), electric vehicle (EV) charging, and other compatible loads within a single installation in real time. Its role is to optimize energy flow between these different sources and loads to maximize solar self-consumption and reduce grid withdrawals.

The unit mounts on a DIN35 rail, measures 108 x 100 x 65 mm, and weighs 0.5 kg. It connects to the electrical panel and operates on both single-phase (1P2W, 100 to 240 V) and three-phase (3P3W or 3P4W, 346 to 415 V) networks. Its power consumption is 4 W.

The Smart Assistant incorporates a Class 1 measurement function with an accuracy of +/- 1% . With a direct connection, it measures currents up to 63 A. Above this threshold, external current transformers (CTs) take over. The voltage measurement range covers 85 to 299 Vac in single-phase (LN) and 148 to 520 Vac in three-phase (LL).

The system manager relies on a predictive model to anticipate solar production and adapt the battery and EV charging/discharging strategy accordingly. This predictive logic distinguishes the EMMA-A02 from a simple load shedding or load distributor: it makes its decisions upstream, based on forecasts, and not solely in reaction to instantaneous variations in production.

In terms of connectivity, the unit has LAN and WAN ports (10/100 Mbps), and an integrated WLAN module (802.11 b/g/n, 2.4 GHz) for commissioning via the application. Huawei , 2 RS485 ports and digital inputs/outputs (2 DI, 2 DO). Initial setup is done via WLAN connection from a smartphone, without requiring prior network cabling.

What are the regulatory obligations for invoicing at 5.5% VAT on a construction site with the HUAWEI - SmartAssistant-A02 (SA4H-A02)?
The decree of September 8, 2025 (Official Journal of September 9, 2025, applicable since October 1, 2025) sets out two cumulative conditions — if one is not met, the 5.5% rate does not apply:

• Le module doit répondre aux critères environnementaux : bilan carbone < 530 kgCO₂eq/kWc, teneur en argent < 14 mg/W, plomb < 0,1%, cadmium < 0,01%. Le BISOL BBO 510 satisfait ces seuils via sa certification RG4.

• The installation must integrate an EMS (energy management system) measuring production and consumption in real time, and controlling usage to maximize self-consumption.

KEY POINTS FOR PROFESSIONALS

• Coordinated management of PV production , battery storage and EV charging from a single unit.

• Integrated prediction model that anticipates solar production to adjust the EV charging/discharging and recharging strategy.

• Accuracy measurement class 1 (+/- 1%) , in direct connection up to 63 A or via external CT beyond.

• Compatible with 1P2W (100 to 240 V), 3P3W and 3P4W (346 to 415 V) networks, covering residential and small commercial configurations.

• Connect up to 3 Huawei inverters , 2 Huawei SCharger charging stations , 1 SG-ready heat pump and up to 20 Shelly devices .

• Integrated WLAN module (802.11 b/g/n, 2.4 GHz) for commissioning via mobile application, without prior network cabling.

• 10/100 Mbps LAN and WAN ports, 2 RS485 ports, 2 digital inputs, 2 digital outputs.

• DIN35 rail mounting , compact format (108 x 100 x 65 mm, 0.5 kg), minimum cabinet size required of 47.5 mm.

• Output power of 9.5 to 13.2 V / 100 mA for powering peripherals (maximum range 3 m).

• 3 LED indicators (RUN, ALM, COM) and RST button for on-site diagnostics and reset.

• Operating temperature range from -25 °C to +60 °C , maximum altitude of 4,000 m (downgraded above 2,000 m).

• IP2X protection rating.

TECHNICAL SPECIFICATIONS

• Reference: Smart Assistant (formerly EMMA-A02)

• Function: Intelligent load manager (Energy Management)

• Dimensions (L x H x D): 108 x 100 x 65 mm

• Installation type: DIN35 rail

• Cabinet size required: 47.5 mm minimum

• Weight : 0,5 kg

• Electrical network type: 1P2W / 3P3W / 3P4W

• Input voltage: 1P2W 100 to 240 V 50/60 Hz, 3P3W 346 to 415 V 50/60 Hz, 3P4W 346 to 415 V 50/60 Hz

• Power consumption: 4 W

• Output power: 9.5 to 13.2 V / 100 mA (maximum range 3 m)

• LAN: 10/100 Mbps (maximum range 100 m)

• WAN: 10/100 Mbps (range 100 m maximum)

• WLAN: AP + STA, 802.11 b/g/n (2.412 to 2.484 GHz) RS485: 9600 / 19200 / 115200 bps, 2 ports (maximum range 50 m)

• Digital inputs: 2 (maximum range 20 m)

• Digital outputs: 2 (maximum range 20 m)

• LED indicators: 3 (RUN, ALM, COM)

• Button: RST Activation: WLAN communication via mobile application

• Current measurement range: direct connection up to 63 A, external CT above 63 A

• Voltage measurement range: 1P (LN) 85 to 299 Vac, 3P (LL) 148 to 520 Vac

• Measurement accuracy: +/- 1%

• Maximum number of connected inverters: 3

• Maximum number of charging stations: 2

• Maximum number of heat pumps: 1 (directly, more via devices) Shelly )

• Maximum number of devices Shelly : 20

• Operating temperature: -25°C to +60°C Storage temperature: -40°C to +85°C

• Operating humidity: 5% to 95% RH (non-condensing)

• Maximum altitude: 4,000 m (downgraded if above 2,000 m) Protection rating: IP2X

• Compatible inverters: SUN2000-2-6KTL-L1, SUN2000-8-10K-LC0, SUN2000-3-10KTL-M1, SUN2000-12-25KTL-M5, SUN2000-5/6/8/10/12K-MAP0, SUN2000-12/15/17/20/25K-MB0, SUN5000-8/12K-MAP0, SUN5000-17/25K-MB0.

• Compatible charging stations: Huawei SCharger-7KS / 22KT-S0

• Compatible heat pump: SG-ready

• Devices Shelly compatible: Shelly Plus Plug S, Shelly Plus 2 PM, Shelly Pro 2PM

Manufacturer's notes

• External CT: the secondary current must be 50 mA, cable length of 30 m maximum.

• Heat pump: One heat pump can be connected directly to the EMMA-A02. Additional heat pumps can be added via devices. Shelly .

• Firmware Shelly Required: 0.12.99plugsprod1 or 0.14.4 for Shelly Plus Plug S, 0.10.2 beta4 for Shelly Plus 2PM, 0.10.2 beta 1 or 1.0.3 for Shelly Pro 2PM.

RECOMMENDED APPLICATIONS

• Residential installations combining solar panels, battery and EV charging station, where the Smart Assistant orchestrates the distribution of energy to promote direct self-consumption.

• Homes equipped with an SG-ready heat pump, to synchronize the operation of the heating with periods of high solar production.

• Multi-inverter residential projects (up to 3 inverters) Huawei ) requiring centralized supervision of production and consumption flows.

• Sites with connected devices Shelly (up to 20), to extend control to additional loads (water heater, lighting, controlled sockets).

• Installations where predictive energy management makes it possible to reduce the share of energy drawn from the grid and to optimize the return on investment of the PV + storage system.

• Single-phase or three-phase residential configurations, the Smart Assistant adapts to both types of connection.

ADDED VALUE POWR CONNECT

POwR Connect Huawei offers the Huawei Smart Assistant manager, which comes with all the components for an installation. Huawei (inverters, LUNA2000 batteries, SCharger terminals, DTSU666 meter, Smart Dongle). Our sales engineers assist installers in integrating the Smart Assistant (formerly EMMA-A02) into the project's electrical diagram: positioning in the panel, choice between direct measurement and external CT, verification of compatibility with the inverters and terminals already installed.

Our design office can intervene to define the software configuration of the Smart Assistant according to the household's consumption profile, the PV sizing and the chosen storage capacity.