Author – Georgia Howson, MCS Certified Battery Storage Installer at Stratford Energy Solutions
SigenStor Home Battery System — Installed by Authorised Sigenergy Experts
Up to 54kWh of modular home battery storage – scalable, solar-ready, and power cut protected. As an authorised Sigenergy installer, Stratford Energy Solutions designs and installs the SigenStor home battery system across the West Midlands, Warwickshire, and surrounding counties, providing MCS-certified installation and long-term aftercare support.
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What Is the SigenStor Home Battery?
The SigenStor Home Battery by Sigenergy is a modular, scalable energy storage system designed to maximise self-consumption of solar energy and provide reliable backup power during grid outages. It combines an energy controller with stackable battery modules, allowing system storage capacity to be scaled from 6kWh up to 54kWh.
Unlike many home batteries that require a separate solar inverter, the SigenStor uses a hybrid inverter that manages both solar input and battery charging in a single unit. This reduces installation complexity and can improve system efficiency. Its lithium iron phosphate (LFP) battery chemistry delivers a strong cycle life and a safe thermal profile.
The system supports both wall-mounted and floor-mounted installation, carries an IP66 outdoor rating, and connects to the mySigen app for real-time monitoring of solar generation, battery status, household consumption and grid interaction.
SigenStor Key Features and Benefits
Scalable Modular Storage
The SigenStor starts at 6kWh or 9kWh and scales to 54kWh by stacking additional battery modules. This modular approach allows you to start with a system sized to your current needs and expand as your household’s energy requirements grow — for example, when you add an EV charger or a heat pump.
All-in-One Hybrid Inverter
The SigenStor’s integrated hybrid inverter handles solar PV input, battery charging, and grid interaction in a single unit, with support for 2 to 4 MPPT inputs depending on the inverter size. This reduces the number of separate components in the system and simplifies installation and maintenance.
Whole-Home Backup Power
The SigenStor’s backup gateway protects critical loads during a power cut, with smart port scheduling for non-critical loads. A fully expanded 54kWh system can provide extended wholehome backup — enough to power a typical UK home for multiple days without grid supply.
LFP Battery Chemistry and Safety
The SigenStor uses lithium iron phosphate (LFP) chemistry, which offers a longer cycle life and a more stable thermal profile than other storage batteries. Safety features include high-temperature pads, aerogel insulation, built-in fire suppression, decompression valves, and temperature monitoring — five independent layers of protection.
IP66 Rated for Indoor and Outdoor Use
The SigenStor carries an IP66 ingress protection rating, making it suitable for indoor or outdoor installation. Dimensions are H:370–1990mm × W:200mm × D:260mm depending on the number of modules, and the system weighs 18–456kg depending on configuration.
mySigen App Monitoring
The mySigen app provides real-time visibility of solar generation, battery status, household consumption, grid interaction, and EV charging status, with updates every 10 seconds. The app supports tariff optimisation, generator input management, and on/off-grid flexibility settings.
How Much Does the SigenStor Battery Cost?
SigenStor pricing depends on the system size you choose, your existing solar setup, and any additional options such as the EV DC charging module or backup gateway configuration. The system is competitively priced for an all-in-one solution because the hybrid inverter is included — unlike some battery storage systems where the inverter is a separate cost.
6kW + 9kwh
£5,800
6kW + 12kwh
£7,375
6kW + 15kwh
£7,985
6kW + 16kwh
£8,665
| Factor affecting price | Detail |
|---|---|
| System size (number of modules) | 6kWh to 54kWh. Each additional module adds to the total cost but increases storage capacity and potential savings. |
| EV DC charging module | The optional 12kW or 25kW EV DC charging module adds to the system cost but eliminates the need for a separate EV charger. |
| Existing solar setup | Retrofitting to an existing solar installation may require additional configuration work versus installing alongside a new solar array. |
| Cable routing complexity | Properties requiring long cable runs or unusual routing between the battery, inverter, and consumer unit may incur additional cost. |
| 0% VAT | All battery storage installations in UK homes carry 0% VAT — already reflected in your quote. |
All installations are carried out by our own in-house Tesla Premium Certified engineers — not subcontractors. If your property has specific requirements (for example, a cable run over 15m or a nonstandard mounting configuration), we will advise during your free survey before any work is agreed.
SigenStor vs Tesla Powerwall 3 — Which Is Right for You?
As authorised installers of both the Sigenergy SigenStor and the Tesla Powerwall 3, we are wellplaced to help you choose the right system for your home. Both are excellent home battery storage solutions — the right choice depends on your priorities and existing setup.
| Feature | SigenStor | Tesla Powerwall 3 |
|---|---|---|
| Storage capacity | 6–54 kWh (modular — start small, scale up) | 13.5 kWh (+13.5 kWh per Expansion Pack, max 54 kWh) |
| Battery chemistry | LFP (Lithium Iron Phosphate) | NMC (Nickel Manganese Cobalt) |
| Integrated solar inverter | Yes — hybrid inverter included, 2–4 MPPT inputs | Yes — DC-coupled inverter built in |
| EV DC charging | Yes — optional 12kW or 25kW DC module | Via 'Charge on Solar' feature (AC) |
| Maximum scalability | Up to 54 kWh in one system | Up to 54 kWh (1 unit + 3 Expansion Packs) |
| Backup power | Yes — critical loads gateway, whole-home backup | Yes — whole-home backup, fast switchover |
| App monitoring | mySigen app (10-second updates) | Tesla app |
| IP rating | IP66 — indoor or outdoor installation | IP67 — indoor or outdoor installation |
| Warranty | 10 years all-inclusive (optional 5-year) | 10 years, unlimited cycles, 70% retention |
| Best for | Homes wanting all-in-one scalability and optional integrated EV DC charging | Homes in the Tesla ecosystem or wanting Powerwall brand reassurance |
Verdict: both systems are excellent. If you want maximum scalability in a single modular unit with the option of integrated EV DC charging, the SigenStor offers greater configurability. If you are already in the Tesla ecosystem, prioritise the brand reassurance of Tesla, or want seamless integration with Tesla solar and EV products, the Powerwall 3 is the stronger fit.
Georgia Howson
MCS Certified Battery Storage Installer at Stratford Energy Solutions
Why We Install the SigenStor — An Installer’s Perspective
“Stratford Energy chose to stock and install the Sigenergy SigenStor alongside the Tesla Powerwall 3 to offer customers greater flexibility and future-proof energy storage options.
SigenStor stands out for its scalable modular design, allowing systems to expand more easily over time. Its all-inone setup combines the hybrid inverter, battery, and energy management system into a single integrated unit, simplifying installation and reducing space requirements.
It also offers integrated DC EV charging, helping customers maximise solar usage and charging efficiency, while its LFP (Lithium Iron Phosphate) battery chemistry provides excellent safety, thermal stability, and long-term reliability. By offering both SigenStor and Tesla Powerwall 3, Stratford Energy can recommend the best solution based on each customer’s property, energy usage, and future plans.
What’s Included in a SigenStor Installation by Stratford Energy?
Every SigenStor installation covers the full process from pre-installation survey to commissioning and aftercare. Here is what is included as standard.
1.
Pre-installation survey of your property, existing solar system, and electrical setup
2.
Supply of the SigenStor battery module(s), hybrid inverter (if you have solar already), and all required accessories
3.
Wall or floor mounting and positioning of the SigenStor unit
4.
Integration with existing solar panels and confirmation of MPPT input configuration
5.
Connection to the electrical consumer unit
6.
DNO notification where required (the SigenStor hybrid inverter reduces the need for separate approvals in most cases)
7.
EV DC charging module installation, cable routing, and configuration (if you have an EV charger)
8.
mySigen app setup, tariff configuration, and handover walkthrough
9.
Full system commissioning, output testing, and sign-off
10.
MCS certificate to support Smart Export Guarantee registration
All installations are carried out by our own in-house MCS-certified engineers. We do not subcontract.
UK Incentives for Home Battery Storage
The same UK government incentives that apply to Tesla Powerwall installations apply to the SigenStor. Every installation we carry out is MCS certified, making it eligible for the Smart Export Guarantee from day one.
Smart Export Guarantee (SEG)
The Smart Export Guarantee pays you for surplus solar electricity exported to the grid. A larger battery — including the SigenStor’s 54kWh maximum — means you can store more surplus before exporting, and export at a time of your choosing to maximise SEG income. We handle SEG registration as part of every installation.
0% VAT on Residential Solar
Battery storage systems installed in UK homes carry 0% VAT. This applies to the SigenStor and is automatically reflected in your quote.
Warm Homes Plan
The government’s Warm Homes Plan may offer further battery storage funding routes as the policy develops. We will keep customers informed as details are confirmed. Our team will identify every available incentive for your installation. Ask about grants when you request your free quote.
SigenStor Home Battery Technical Specifications
The specification table below covers the SigenStor system as installed.
| Specification | Detail |
|---|---|
| Battery modules | 6 kWh or 9 kWh (usable: 5.84 kWh / 8.76 kWh), stackable up to 54 kWh, LFP chemistry |
| Safety features | High-temp pads, aerogel insulation, built-in fire suppression, decompression valve, temperature monitoring |
| Inverter / energy controller | Continuous AC output: 3–12 kW, Maximum PV input: up to 2x inverter rating, MPPT inputs: 2–4 |
| DNO compliance | Hybrid inverters reduce need for separate DNO approvals for PV and battery |
| EV DC charging module (optional) | Sizes: 12 kW or 25 kW, cable lengths: 5m / 7.5m / 10m, charges EVs up to 3.5x faster than AC |
| Gateway and backup | Backup port for critical loads, smart port for scheduled/noncritical loads, generator input support, on/off-grid flexibility |
| Monitoring and control | mySigen app: real-time solar generation, battery status, household consumption, grid interaction, EV charging; updates every 10 seconds |
| Installation | Wall or floor-mounted, indoor/outdoor (IP66 rated), dimensions: H:370–1990mm × W:200mm × D:260mm, weight: 18–456 kg |
| Warranty | 10 years all-inclusive (optional 5-year extension), 70% capacity guaranteed after 10 years, EV DC charger: 3 years |
| Other features | Tariff integration, modular and future-proof design, operating temperature: -20°C to 60°C |
Full specifications – https://www.sigenergy.com/en/products/sigenstor
Why Choose Stratford Energy Solutions for Your SigenStor Installation?
Not every solar and battery installer has authorised Sigenergy installer status. We do, and it matters: it means our engineers are trained to Sigenergy’s installation standards, we have direct access to Sigenergy’s technical support, and we can facilitate product warranty claims on your behalf.
Authorised Sigenergy Installer
We are an authorised Sigenergy installer — one of a limited number of certified UK installers for the SigenStor. This gives our customers direct access to Sigenergy warranty support and means the installation is carried out to Sigenergy’s own standards.
Also Authorised for Tesla Powerwall 3
We are also Tesla Premium Certified Installers for the Powerwall 3. This means we can give you an unbiased, experienced comparison of both systems and recommend the right one for your specific property and energy goals.
MCS Certified — SEG Eligible
Every SigenStor installation we carry out is MCS certified, making it eligible for the Smart Export Guarantee from day one. We handle all certification and SEG registration paperwork.
In-House Engineers with 10+ Years’ Experience
All SigenStor installations are carried out by our own in-house engineers. No sub-contractors. Several members of our team have more than 10 years of individual battery storage installation experience.
5-Year Workmanship Warranty
Our 5-year workmanship warranty covers the quality of every installation. Sigenergy’s 10-year allinclusive product warranty (with optional 5-year extension) covers the hardware. We facilitate any product warranty claims on your behalf.
Real installations. Real savings.
How to Order the SigenStor Home Battery
The SigenStor is available now in the UK. As an authorised Sigenergy installer, we have direct access to stock and can provide fast, professional installation across the Midlands and surrounding counties.
1.
Free Survey
Contact our sales team by phone (01789 262 411), email (pv@stratfordenergy.co.uk), or the quote form. We will assess your existing solar setup, discuss which SigenStor configuration suits your energy goals, and advise on EV DC charging integration if relevant.
2.
Fixed-Price Proposal
We send you a detailed, no-obligation proposal covering system size, optional modules, installation costs, expected savings, and payback period. The quotation is valid for 30 days. A 14-day cooling off period applies under the Consumer Contracts Regulations 2013.
3.
Installation and Commissioning
We agree an installation date. Our engineers fit the SigenStor, complete all electrical connections and app configuration, and walk you through the mySigen monitoring features before they leave. Final payment is due on completion.
SigenStor Battery FAQs
These are the questions we are asked most often about the SigenStor. Call 01789 262 411 if your question is not here.
The SigenStor is a modular, scalable home battery storage system made by Sigenergy. It combines a hybrid solar inverter with stackable LFP battery modules, allowing storage capacity to range from 6kWh to 54kWh in a single system. It is compatible with new solar installations and existing solar arrays, and includes real-time monitoring via the mySigen app.
SigenStor pricing depends on the system size, optional EV DC charging module, and installation complexity. See the full pricing section above for detail. For an accurate quote based on your property and energy requirements, contact our team for a free survey.
Yes. The SigenStor can be retrofitted to an existing solar installation. The hybrid inverter is compatible with most solar PV systems via its MPPT inputs. We assess compatibility with your existing setup during the free pre-installation survey.
The SigenStor supports stacking up to a maximum of 54kWh of total storage in a single system. Each module adds 6kWh or 9kWh of usable capacity. Additional modules can be added at the time of installation or retrofitted later as your storage requirements grow.
The SigenStor carries a 10-year all-inclusive warranty from Sigenergy, with a 70% capacity guarantee after 10 years. An optional 5-year warranty extension is available. The EV DC charging module carries a separate 3-year warranty. Our own 5-year workmanship warranty covers the installation. We facilitate all product warranty claims on your behalf.
Yes. The SigenStor includes a backup gateway that automatically switches to backup mode during a grid outage. Critical loads (lighting, refrigeration, essential appliances) are protected. The smart port can be used to schedule which non-critical loads are powered during backup. A fully configured 54kWh system can power a large UK home for multiple days during an extended outage.
Both are excellent home battery systems. The SigenStor offers greater modular scalability in a single unit and includes an optional integrated EV DC charging module. The Tesla Powerwall 3 is well-suited for homes in the Tesla ecosystem or those wanting the brand reassurance of Tesla. We install both products and can give you an unbiased recommendation. See the full comparison table above.
Yes. As an MCS certified installer, every SigenStor installation we carry out is eligible for the Smart Export Guarantee (SEG) from day one. We provide the MCS installation certificate required for SEG registration with most energy suppliers and can advise on the registration process.
In most cases, no. Standalone battery storage systems installed inside or within the curtilage of a dwelling are generally covered by Permitted Development rights in England. If your property is listed or in a designated area, different rules may apply. We will advise during your free survey.
The SigenStor uses the mySigen app as its primary monitoring and control interface. Sigenergy provides developer documentation and an API that may support third-party integrations including Home Assistant. Contact our team or refer to Sigenergy’s developer resources for the latest integration guidance.
Ready to Invest in Home Battery Storage?
Speak to our friendly sales team, one of our Sales Managers will assess your property, review your solar setup, and recommend the right SigenStor configuration for your household. There is no obligation and no hard sell.
Call 01789 262 411, email pv@stratfordenergy.co.uk, or complete the quote form. Quotations are valid for 30 days. A 14-day cooling-off period applies on all residential contracts.
