At Heatable, we’re here to help you make smart, eco-friendly choices. With energy prices jumping around like a kangaroo on a trampoline, battery storage solutions like the Sigenergy SigenStor are total game-changers.
The Sigenergy SigenStor is a sleek, all-in-one energy storage solution that’s been growing in popularity since its launch, back in 2022. But is it the right choice for you?
In this review, we’ll dive into the SigenStor’s features, performance, and value, compare it to heavyweights like the Tesla Powerwall and GivEnergy, and help you decide if it’s a keeper.
Oh, and here’s a cheeky tidbit: it’s technically pronounced “Sige” energy, but in the UK, we’re sticking with “Sig” - because who’s got time for extra syllables?
PS We offer MCS-certified battery installation nationwide. Simply answer these questions, get your fixed price, and arrange your free design.
Quick Summary:
Scalable up to 48 kWh per stack: Modular 5 kWh or 8 kWh batteries expand effortlessly, with parallel stacking for larger needs.
Seamless solar integration: Works with any solar panel type and optimises for complex roofs or shading.
0ms backup switchover: Instant power during outages keeps your home humming.
AI-driven mySigen app: Boosts savings with real-time monitoring and tariff syncing.
Optional 25 kW DC EV charger: Future-proofs with bi-directional charging.
Get your free battery storage quote here.
What Is the Sigenergy SigenStor?
The Sigenergy SigenStor is pitched as a “5-in-1” energy storage system, bundling a solar inverter, battery pack, energy management system (EMS), battery power conversion system (PCS), and an optional EV DC charger into one modular unit.
Available in single- and three-phase variants, it’s designed to be scalable, stylish, and clever, slotting neatly into solar-powered homes.
Its Lithium Iron Phosphate (LiFePO4) battery modules come in 5 kWh or 8 kWh sizes, stackable up to 48 kWh per tower, making it versatile for everything from compact flats to power-hungry family homes.
The mySigen app is a standout, offering real-time monitoring and AI-driven optimisation to fine-tune charging and discharging based on your usage and energy tariffs.
It also boasts a 0ms switchover time for backup power, so you’re never left scrambling during a blackout - perfect for when even a dodgy Wi-Fi signal feels like the end of the world.
But let’s get stuck into what makes this system special…
Key Features and Performance
Modular and Scalable Design
The SigenStor’s scalability is its superpower, offering unmatched flexibility for UK homeowners.
It starts with 5 kWh or 8 kWh battery modules, which you can stack up to six per tower for a whopping 48 kWh of storage - enough to power most homes through peak times or even a full day off-grid.
Need more? You can connect multiple stacks in parallel, with no hard limit on total capacity, making it ideal for larger properties, EV-heavy households, or those eyeing future expansions like heat pumps.
Each module slots together with quick connectors, so adding capacity is as simple as stacking Lego bricks - no rewiring or major retrofits needed, which keeps installation costs down.
This modularity means you can start small - say, a single 8 kWh module for basic solar storage - and scale up as your budget or energy needs grow.
For example, a typical UK home using 3,600 kWh annually might begin with 16 kWh (two 8 kWh modules) to cover evening demand, then add another 8 kWh when they buy an EV.
Unlike fixed-capacity systems, the SigenStor grows with you, and its DC-DC optimisers ensure efficiency doesn’t dip as you add modules.
This adaptability is a big advantage, and it’s a breeze to expand compared to retrofitting other brands. Whether you’re a minimalist or planning a full-on energy fortress, the SigenStor’s got you covered.
Solar Panel Integration
The SigenStor is a solar enthusiast’s dream, designed to play nicely with virtually any solar panel setup.
It's built-in hybrid inverter supports both new and existing arrays, working with monocrystalline, polycrystalline, or even bifacial panels, so you’re not locked into specific brands or models.
It handles up to 25 kW of solar input per stack, which is ample for most UK homes - think 20-30 standard 400-watt panels, enough to generate 8,000-12,000 kWh annually in sunny spots like Cornwall.
The system’s compatibility with third-party optimisers, like Tigo, is a big win for tricky roofs with shading from chimneys, trees, or nearby buildings, ensuring every panel performs at its peak.
For complex installations, the SigenStor shines. It supports up to four independent MPPT (Maximum Power Point Tracking) channels, allowing you to split your array across different roof angles or orientations - say, east and west-facing panels - without losing efficiency. This is a step up from many competitors, which often max out at two MPPTS.
The system also adjusts dynamically to partial shading or dirt, so you’re not losing precious energy if a pigeon decides your panels are a prime loo spot.
Integration with existing 4-10 kW solar setups is also feasible, and the mySigen app lets you track each panel’s output in real time, giving you geek-level control over your system.
Whether you’re upgrading an old array or starting fresh, the SigenStor makes solar synergy a doddle.
Explore a Battery Storage Case Study: Check out an insightful Q&A session featured in one of our detailed case studies on battery storage. Hear directly from a Heatable customer in the UK and gain valuable perspectives on their experience here.
The image above features a Tesla Powerwall 3 installation performed by our team of Tesla-certified installers at Heatable.
AI-Powered Monitoring
The mySigen app is SigenStor’s brain, updating every 10 seconds to show solar generation, battery status, and household consumption in sharp detail.
Its AI learns your usage patterns - when you’re brewing endless cups of tea or charging your EV - and syncs with tariffs like Octopus Flux to charge cheap and discharge smart.
It’s not as glossy as some rivals’ apps, but it’s packed with data and easy enough for most to navigate.
Backup and EV Charging
With a 0ms switchover, the SigenStor keeps your home ticking during power cuts - a godsend for rural UK homes where outages are as common as rain.
The optional 25 kW DC EV charger is a futuristic touch, offering bidirectional charging (Vehicle-to-Home and Vehicle-to-Grid) for next-gen integration.
At £8,500, though, it’s a wallet-buster. A standard 7 kW AC charger is far cheaper, so weigh up whether you need that DC muscle.
Safety and Warranty
Built with LiFePO4 chemistry, the SigenStor is safe and stable, with five layers of protection, including AI-monitored temperature sensors and an internal fire suppression system.
It’s IP66-rated, ready for the UK’s soggy weather, and operates from -20°C to 55°C.
The 10-year warranty is standard, guaranteeing 70% capacity retention or a minimum throughput (15.85 MWh for 5 kWh modules, 23.77 MWh for 8 kWh). The EV charger gets a 3-year warranty, which is solid but not class-leading.
Real-World Performance
In action, the SigenStor delivers. It's a 4 kW discharge rate per 8 kWh module (up to 20 kW with five modules) handles most household loads effortlessly.
The easy installation and reliability are noteworthy, though admittedly the app could use a bit more polish.
For a typical UK home using 3,600 kWh annually, a 16 kWh setup could cover most evening and peak-time needs, especially with a 6-8 kW solar array feeding it.
Comparison Table: SigenStor vs Tesla Powerwall vs GivEnergy
Feature | Sigenergy SigenStor | Tesla Powerwall 3 | GivEnergy All-In-One |
Capacity (per unit) | 5 kWh or 8 kWh, up to 48 kWh per stack | 13.5 kWh, up to 54 kWh | 13.5 kWh, up to 27 kWh |
Scalability | Stackable modules, unlimited parallel stacks | Up to 4 units | Up to 2 units |
Phase Support | Single- and three-phase | Single-phase only | Single-phase (three-phase with add-ons) |
Backup Switchover | 0ms | Near-instant | <20ms |
EV Charging | Optional 25 kW DC, bi-directional | None (separate Tesla charger needed) | None (separate charger needed) |
Battery Type | LiFePO4 | LiFePO4 | LiFePO4 |
App Quality | Good, AI-driven, slightly less polished | Slick, highly integrated | Solid, tariff-compatible |
Warranty | 10 years (70% capacity) | 10 years (70% capacity) | 10 years (70% capacity) |
Estimated Cost (Installed) | £9,000-£10,000 (13 kWh, no EV charger) | £10,000 (13.5 kWh) | £7,500-£8,500 (13.5 kWh) |
Brand Experience | New (since 2022) | Established (since 2015) | Established in the UK (since 2019) |
SigenStor vs Tesla Powerwall
The Tesla Powerwall 3 is the big cheese in home battery storage, so how does the SigenStor compare?
Capacity and Scalability: The Powerwall 3 offers a fixed 13.5 kWh per unit, expandable to 54 kWh with extra packs. The SigenStor starts at 8 kWh and scales to 48 kWh per stack, with no cap on parallel stacks - perfect for those planning mega setups. Its modular approach also lets you add capacity in smaller increments, unlike the Powerwall’s all-or-nothing units.
Design and Features: The Powerwall 3 is sleek, with a built-in hybrid inverter, but it’s single-phase only, limiting its use in three-phase homes. The SigenStor supports both single- and three-phase, and its optional DC EV charger gives it an edge - Tesla owners need a separate charger. The SigenStor’s four MPPT channels also outshine the Powerwall’s two for complex solar setups.
Performance: Both offer seamless backup (Powerwall’s switchover is near-instant) and use LiFePO4 batteries for longevity. The Powerwall’s app is slicker and tightly integrated with Tesla’s ecosystem, but the SigenStor’s support for third-party optimisers like Tigo makes it better for shaded or multi-angle roofs.
Cost: A Powerwall 3 costs around £10,000 installed, while a 13 kWh SigenStor setup (8 kWh + 5 kWh) is £9,000-£10,000, excluding the EV charger. The SigenStor’s modularity can save money upfront, but the charger’s cost stings.
Brand Reliability: Tesla’s been rocking it since 2015, with a bulletproof reputation. Sigenergy, founded in 2022, is newer, so there’s less long-term data, which might worry some.
Verdict: The Powerwall 3 is ace for single-phase homes wanting a polished, no-fuss system, especially if you’re Team Tesla.
The SigenStor wins for scalability, three-phase support, and solar flexibility, but its newer brand status might give you pause.
SigenStor vs GivEnergy
GivEnergy’s All-in-One battery is a UK favourite, so let’s see how it stacks up.
Capacity and Scalability: The GivEnergy All-in-One offers 13.5 kWh per unit, expandable to 27 kWh with a second unit. The SigenStor’s 5 kWh or 8 kWh modules scale to 48 kWh per stack, with parallel options for limitless growth, offering more flexibility for big energy users.
Design and Features: Both are AC-coupled (great for retrofitting), but the SigenStor’s 5-in-1 design includes that EV charger option, which GivEnergy lacks - you’d need a separate charger. The SigenStor’s four MPPT channels also give it an edge over the All-in-One’s two for diverse solar arrays, though both are IP65/66-rated for UK weather.
Performance: GivEnergy’s app is solid, with 10-15 second updates and tariff compatibility, like the SigenStor. But the SigenStor’s 0ms switchover trumps GivEnergy’s slightly slower backup, and its Tigo support boosts solar efficiency on tricky roofs. Both use LiFePO4 for safety.
Cost: A GivEnergy All-in-One with gateway costs £7,500-£8,500 installed, often cheaper than a 13 kWh SigenStor setup. The SigenStor’s smaller starting point can be more budget-friendly initially, though.
Brand Reliability: GivEnergy’s five-year UK track record edges out Sigenergy’s newer status, but Sigenergy’s ex-Huawei leadership and strong early reviews inspire confidence.
Verdict: GivEnergy is a wallet-friendly, reliable pick for simple solar storage, especially for smaller homes.
The SigenStor offers superior scalability and solar integration, but its cost and newer brand might not suit everyone.
SigenStor Pros and Cons
Pros
Scalable: Stackable from 5 kWh to 48 kWh per tower, with parallel options.
Solar-Friendly: Four MPPTS and Tigo compatibility for optimal panel performance.
Versatile: Supports single- and three-phase homes, with full three-phase backup.
Smart: AI-driven app maximises savings and monitoring.
Future-Proof: Bi-directional EV charging and V2H/V2G compatibility.
Cons
Pricey Add-Ons: The £8,500 EV charger is a stretch for most budgets.
New Brand: Sigenergy lacks the long-term track record of Tesla or GivEnergy.
App Polish: mySigen is good but lags behind Tesla’s slick interface.
Overkill for Some: Smaller homes might not need its full feature set.
Is the SigenStor Right for You?
The Sigenergy SigenStor is a bold, feature-rich system that’s shaking up the UK battery storage scene.
Its unmatched scalability, top-notch solar integration, and EV charging potential make it a cracking choice for homeowners thinking long-term - think sprawling solar arrays, EVs, or off-grid vibes.
Compared to the Tesla Powerwall 3, it offers more flexibility, three-phase support, and better handling of complex solar setups, though it lacks Tesla’s polished ecosystem.
Against GivEnergy’s All-in-One, it’s pricier but brings superior scalability and solar optimisation, ideal for tech-savvy users.
That said, it’s not a universal fit. Smaller households or those pinching pennies might lean towards GivEnergy’s simpler, cheaper setup, while Tesla fans will stick with the Powerwall’s proven clout.
Sigenergy’s newer status means you’re taking a slight leap, but early buzz suggests it’s a solid bet. If you want a system that grows with you, loves your solar panels, and tackles everything from blackouts to EV charging, the SigenStor is well worth a gander.
At Heatable, we’re here to help you navigate your options and find the perfect battery storage system for your home. Drop us a line for a free quote, and let’s make your energy setup as clever as your smart meter!
Disclaimer: Prices are indicative and based on UK averages as of April 2025. Always check with installers for the latest costs and compatibility with your setup.
Next Steps For Your Battery Journey:
When planning to install battery storage for your home, there are several important factors to consider. Make sure to refer to the following guides to help you make informed decisions:
To dive deeper into these topics, head over to our advice section, check out our YouTube channel for informative videos, or read a customer case study to see how others have benefited from their battery installation.
Get a Quote for a SigenStor Battery Today
Without boasting, you should get your battery storage installed with us, here's why:
Thousands of Happy Customers: We boast an average score of 4.9 on Trustpilot, outperforming the market leader.
Which? Trusted Trader: Heatable is proudly recognised as a Which? Trusted Trader.
Tesla Certified Installer: Heatable is proudly certified and approved by Tesla to install the Powerwall.
MCS Accredited: Our accreditation by the Microgeneration Certification Scheme (MCS) ensures high-quality standards.
Consumer Protection: As members of the HIES consumer code, we provide 2-year deposit protection.
Flexible Payment Options: Choose from multiple payment methods, including finance options.
Fixed Price Guarantee: Enjoy transparency with no hidden costs.
Save Your Quote: You can save your quote and decide later.
Bespoke Battery Quote Tool: Find out which battery is ideal for your home, here.
