5kW 28kWh Single Phase ESS Kit

The Installer’s Problem: Component Matching Takes Time

Every UK solar installer knows the drill. A customer wants battery storage. You spec an inverter from one brand, batteries from another, then spend hours checking compatibility–will the BMS communicate properly? Is the voltage range matched? Will the warranty hold up if something goes wrong with a mixed-brand system?

One MCS-certified installer we spoke to put it bluntly: ”I’ve had jobs where the inverter and battery just wouldn’t talk to each other. Two hours on the phone with tech support, firmware updates, endless troubleshooting–and I’m not getting paid for any of it.”

TheSinoah5kW 28kWh Single Phase ESS Kit solves this problem at the source. It’s a pre-matched system–the 5kW hybrid inverter and two 14kWh stackable battery modules are designed, tested, and certified to work together. Communication protocols are pre-configured. Voltage ranges are perfectly aligned. The installer doesn’t need to be a systems integrator–just mount, connect, and commission.

What’s in the Kit

TheSinoah 5kW 28kWh Single Phase ESS Kit includes everything needed for a complete home storage installation:

·1×5kW Single Phase Hybrid Inverter (BW-INV-SPH5K)

·2×14kWh Stackable LiFePO4 Battery Modules (BW-BAT-14S1-H / BW-BAT-0752-H)

·Pre-made power and communication cables

·Mounting base and stacking hardware

·CT clamp and meter for system monitoring

The inverter and batteries arrive in a single consolidated shipment from Sinoah Energy’s UK warehouse–no multiple deliveries, no missing components, no compatibility surprises.

Why 28kWh? The Sweet Spot for UK Homes

The 28kWh configuration (two 14kWh modules stacked together) represents the sweet spot for UK households with solar PV, electric vehicles, or high evening consumption.

For a typical 3–4 bedroom home with a 4kWp solar array, 28kWh of usable storage (27.57kWh at 98% DoD) stores an entire summer day’s solar generation and then some. During winter months, the system charges overnight on cheap off-peak tariffs (Octopus Go at 7–9p/kWh) and discharges during peak periods (25–35p/kWh), delivering substantial bill savings.

For homes with electric vehicles, 28kWh provides enough stored energy to add 80–100 miles of EV range–perfect for overnight charging without drawing expensive peak-rate grid power.

For whole-home backup, 28kWh keeps essential circuits running for 24–48 hours during a grid outage, depending on consumption. Lights, router, fridge, heating controls, and even a kettle remain operational when the grid fails.

The Battery: LFP Chemistry with Self-Heating

The two 14kWh modules in this kit use Lithium Iron Phosphate (LFP) cell chemistry–the safest and most durable lithium battery technology available for residential storage. Unlike nickel-manganese-cobalt (NMC) batteries, LFP is intrinsically stable with a higher thermal runaway threshold and no cobalt-related supply chain concerns.

Each module carries an IP66 ingress protection rating–fully protected against dust and powerful water jets. This means the kit can be installed outdoors on external walls, in carports, or in garden buildings without concern about driving rain or coastal salt spray.

The self-heating technology enables charging at temperatures as low as -20°C. In a UK winter, garages and external installations can easily drop below freezing–a condition that would prevent many standard lithium batteries from charging. The NeoVolt modules automatically activate their heating systems when temperatures fall, ensuring year-round operation.

The Inverter: 5kW of Smart Energy Management

The 5kW hybrid inverter (BW-INV-SPH5K) is the brains of the operation. It intelligently manages energy flows between solar PV, battery storage, and the grid:

1. Solar self-consumption

During daylight hours, the inverter prioritises solar power for home loads, storing excess in the 28kWh battery bank. This increases self-consumption from 40% to 85%+ for a typical UK home.

2. Smart tariff optimisation

The inverter can be programmed to charge batteries overnight on cheap rates and discharge during peak periods, effectively arbitraging the price difference. For a 28kWh system on Octopus Go, this can save £500–£800 annually.

3. Seamless backup

With the optional backup box, the inverter switches to battery power in under 10 milliseconds–fast enough to keep sensitive electronics running without interruption. It provides 10kVA surge capacity and 5kW continuous backup, enough to run essential home circuits during grid outages.

4. Dual MPPT trackers

Two independent MPPT trackers accept up to 15A each, supporting solar strings with different orientations (e.g., east and west roof slopes) for maximum energy harvest.

Real-World Application: The Family Home with EV

Consider a 4-bedroom detached home in the South East with a 5kWp solar array, an electric vehicle, and annual consumption of 6,000kWh. The family currently exports 50–60% of their solar generation at a low export rate (5–8p/kWh). On Octopus Go, they pay 9p/kWh overnight and 28p/kWh during peak hours.

Installing the 5kW 28kWh Single Phase ESS Kit transforms their energy economics:

1. Summer scenario

The 5kWp array generates 20–25kWh on sunny days. The 28kWh battery stores surplus solar (12–15kWh) for evening use, increasing self-consumption from 40% to 85%. Grid import drops from 3,600kWh to 900kWh annually.

2. Winter scenario

Solar generation drops to 3–5kWh per day. The 28kWh battery charges overnight on the 9p/kWh rate and discharges during peak 28p/kWh periods. This“tariff arbitrage”alone saves £400–£500 per year.

3. Annual savings

Combined solar self-consumption and tariff optimisation deliver £800–£1,000 in annual bill savings.

From an Installer’s Perspective: Faster Installation, Fewer Callbacks

We asked a UK MCS-certified installer who has fitted over 20 Sinoah systems what makes the kit approach different:

“The big thing is time. With a kit, everything is pre-matched–the CAN communication works out of the box, the voltage ranges are already set, and the mounting hardware is all in one box. I don’t need to spend an hour checking compatibility or two hours on the phone with tech support. That saves me half a day on each job.”

1. Weight and handling

Each 14kWh module weighs 128 – 134kg – heavy but manageable with two people. The floor-stacked design means no wall-mounting complications. Modules simply stack on top of each other with plug-and-play connections.

2. Cable management

Pre-made power and communication cables with clearly labelled connectors reduce wiring time significantly. The CAN communication interface ensures seamless integration–plug in, power on, and the system auto-detects the battery configuration.

3. Commissioning

The inverter’s LCD display and NeoVolt App guide installers through setup in under 30 minutes. Select the battery capacity, set the grid standard (G99/G98), and the system is ready.

4. Fewer callbacks

Because the system is pre-matched and factory-tested, compatibility issues are virtually eliminated. The 10-year warranty and UK-based technical support mean any issues are resolved quickly–without the installer acting as a middleman between different component manufacturers.

Technical Specifications

Why Choose theESS Kit from Sinoah Energy

1. One Box, One Shipment, One Warranty

The entire kit ships from our UK warehouse in a single delivery. No multiple suppliers, no partial shipments, no compatibility guesswork. One point of contact for warranty claims–we handle everything.

2. Factory Direct Pricing

As a direct supplier from NeoVolt’s manufacturing facility, we offer competitive trade pricing without middlemen. Our factory has over 10 years of experience in lithium battery and power electronics production.

3. 10-Year Warranty

Both the inverter and batteries come with a 10-year warranty–giving installers and homeowners long-term confidence.

4. UK Stock, Fast Delivery

Sinoah Energy maintains inventory in our UK warehouse, meaning no shipping delays or customs clearance issues.

5. Technical Support

Our UK-based team provides pre-sales consultation, installation guidance, and after-sales support. We‘re here to help with system design, commissioning questions, and troubleshooting.

6. G99 Certified

Full UK grid compliance means no commissioning delays.

7. VPP and FCAS Ready

The system is compatible with Virtual Power Plant and Frequency Control Ancillary Service programmes, enabling future revenue streams for homeowners.

Trusted by Installers Across the UK

Sinoah Energy has supplied NeoVolt complete systems to solar installers, electrical contractors, and renewable energy specialists across the UK. From sole traders fitting 2–3 systems per month to national distributors supplying hundreds of units annually, our customers value the simplicity of a pre-matched kit–less time on compatibility, more time on installation.

With over 10 years of factory experience in lithium battery and energy storage production,We have the manufacturing capacity and quality control systems to meet growing UK demand. Every inverter and battery module undergoes rigorous testing before leaving the factory–including capacity verification, insulation testing, and communication validation.

Ready to simplify your installations with the 5kW/28kWh ESS Kit?

Contact us and become a trade partner today and access competitive pricing, UK stock, and dedicated technical support.

FAQ:

Q1: How much could a homeowner save annually with this kit?

A: A typical UK household uses 2,700 kWh per year. With 28kWh of storage and smart tariff optimisation (charging overnight at 7–9p/kWh on Octopus Go and discharging during peak 25–26p/kWh periods), homeowners can save £500–£800 per year on electricity bills. Combined with solar self-consumption, total savings can reach £800–£1,000 annually.

Q2: Does the kit provide backup power during a grid outage?

A: Yes – with the optional backup box installed. The inverter switches to battery power in under 10 milliseconds – fast enough to keep routers, computers, and sensitive electronics running without interruption. It provides 10kVA surge capacity and 5kW continuous backup, enough to run lights, fridge, heating controls, internet, and TV.

Q3: Can I add more battery modules to the 28kWh kit later?

A: Yes. The system is fully scalable – you can add up to two more 14kWh modules (total 56kWh) as energy needs grow. The modular stackable design means no rewiring or system replacement – simply stack additional modules on top and plug in the pre-made cables. Future-proofing built in.