Huawei LUNA2000 S1 home battery installation: what the job involves

Video reference. "Think Battery Installs Are Complicated? Think Again! - Huawei Luna S1" follows a UK residential installation by Brite Energy, a solar and battery installer covering the Thames Valley, south-east England and greater London. The video shows the mounting and stacking of LUNA2000 S1 modules, AC supply wiring, CT clamp orientation, and commissioning on the FusionSolar platform. It is a straightforward real-world job rather than a product demonstration.

1. Surveying the site and assessing the coupling method

The installer visits the property before ordering equipment. The priority at this stage is working out the coupling method. Homes that already have a Huawei SUN2000 hybrid inverter can take the LUNA2000 S1 DC-coupled, connecting directly to the inverter's battery port. DC coupling keeps the energy path short and gives better round-trip efficiency than routing through two inverters.

Where the existing solar uses a different inverter brand, or where there are no solar panels at all, the LUNA2000 S1 can connect AC-coupled via a dedicated AC supply circuit from the consumer unit. The installer assesses the consumer unit for available ways, measures peak import current, and reviews whether backup capability is required and what transfer switching that would need.

2. Determining module count and total capacity

The LUNA2000 S1 comes in 5 kWh and 10 kWh per module variants and can be stacked to a total of 30 kWh. The installer sizes the system based on the household's daily electricity consumption, the solar array output where present, and the backup duration required. A typical UK household wanting to cover overnight demand from a summer day's solar generation might need 10 to 15 kWh, but the exact figure depends on the specific property and the energy tariff.

The physical footprint of the chosen configuration is assessed at this stage too. The battery modules are compact, but a multi-module stack needs enough wall space and ventilation clearance, and the wall or floor surface must be able to take the combined weight.

3. Preparing the mounting position and cable entries

LUNA2000 S1 modules are designed for wall mounting, typically in a garage, utility room or plant room. The installer checks that wall fixings are suitable for the masonry type, confirms that the operating temperature range is met year-round (particularly in an unheated garage in winter), and fits cable entry glands before the modules go on the wall. Trying to route cables after the modules are mounted is significantly harder.

4. Running and connecting the supply cable

For DC-coupled installations, the battery cable connects to the designated battery port on the Huawei SUN2000 inverter using the manufacturer's cable assembly. For AC-coupled systems, a dedicated twin-and-earth cable runs from the consumer unit to the battery inverter input. The conductor size is selected to stay within the volt-drop limit at BS 7671 Regulation 525, accounting for the cable route length and method of installation. All connections inside the inverter terminal block are made to the torque values in the Huawei installation manual.

5. Fitting the MCB at the consumer unit

The AC supply circuit is protected by an MCB sized to match the cable and the system's rated charge and discharge current. Where the consumer unit provides full RCD protection through RCBOs throughout, a standard MCB is sufficient. The installer verifies polarity and earth continuity on the new circuit before closing the board. All terminals are torqued and the board is re-labelled to show the new circuit.

6. Installing and orienting the CT clamp

A current transformer (CT) clamp fits around the grid import conductor, typically at the consumer unit or near the meter. The clamp orientation is critical: fitting it the wrong way round inverts the import and export readings, causing the battery to charge when it should discharge and export when it should store. The signal cable routes to the Huawei Smart Energy Controller or inverter meter port, and the reading is verified before commissioning proceeds.

7. Commissioning on FusionSolar and notifying Part P and DNO

With all connections made and dead tests passed, the installer powers the system and steps through the FusionSolar commissioning wizard. Charge and discharge schedules are set to suit the household's energy tariff, backup mode is configured and tested if included, and a test cycle confirms the system charges, discharges and responds to CT clamp readings correctly.

The installation is then notified through the installer's Part P registered competent person scheme: you receive an Electrical Installation Certificate. DNO notification follows: G98 self-certification applies to systems exporting up to 3.68 kW per phase on a single-phase supply, with the DNO notified within 28 days. Larger or three-phase systems require G99 pre-approval before installation starts. Keep the EIC and DNO notification letter with your property documents.

When to call us

Richard installs home battery storage systems across east Kent, including Huawei LUNA2000 S1 and other brands. He handles the supply wiring, CT clamp, FusionSolar commissioning, Part P certification and DNO notification. Get in touch for a free fixed quote.