Sigenergy UK: Battery, Hybrid Inverter & EV Charger Review
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
Sigenergy is a fast-growing energy storage company offering an all-in-one solar inverter, battery, and EV charging system. Here's our independent review of the SigenStor system for UK homes, covering specs, AI energy management, and how it compares to Tesla Powerwall and Huawei Luna. Works with any solar panel brand including Jinko, JA Solar, and Trina.
Quick Answer
Sigenergy's SigenStor is an all-in-one hybrid inverter, battery storage, and EV charging system with AI-powered energy management. It's stackable from 6kWh to 54kWh, making it one of the most flexible battery solutions available in the UK. The built-in AC/DC EV charging (with vehicle-to-grid) is unique. Ranked #1 battery manufacturer in Australia by capacity in 2025. Growing fast in the UK with MCS-certified installers.
Who Are Sigenergy?
Sigenergy is an energy technology company founded in 2022 that has grown rapidly in the residential solar battery market. They don't make solar panels — instead they make the hybrid inverter, battery storage, and EV charging system that works alongside any brand of solar panels.
In March 2025, Sigenergy was ranked the #1 battery manufacturer in Australia by blended capacity (SunWiz report). The SigenStor took 2nd place in the 2025 Installers' Choice Awards. They are expanding rapidly in the UK with a growing network of MCS-certified installers.
2022
Founded
#1
AU battery market
54kWh
Max capacity
EV
Charging built-in
SigenStor: The All-in-One System
The SigenStor combines a hybrid solar inverter, stackable battery modules, and an EV charger in one integrated system. This means you need fewer separate components, simpler installation, and one app to manage everything.
Hybrid Inverter
5kW, 8kW, 10kW, or 12kW options. Up to 4 MPP trackers, 97.6% conversion efficiency, DC/AC ratio up to 2. IP66 rated for outdoor installation.
Stackable Battery
LFP (Lithium Iron Phosphate) modules in 6kWh (BAT-6.0) or 9kWh (BAT-9.0) units. Stack up to 54kWh per tower. Add modules as your needs grow — no need to replace the whole system.
EV Car Charger
Built-in AC and DC EV car charger. Supports vehicle-to-grid (V2G) and vehicle-to-home (V2H). Your EV battery becomes an extension of your home storage — no separate car charger needed.
SigenStor System Specifications
| Component | Specification |
|---|---|
| Inverter Power | 5kW / 8kW / 10kW / 12kW |
| MPP Trackers | Up to 4 |
| Inverter Efficiency | 97.6% |
| DC/AC Ratio | Up to 2 |
| IP Rating | IP66 (dust and rain resistant) |
| Battery Modules | 6kWh (BAT-6.0) or 9kWh (BAT-9.0) per module (LFP) |
| Max Battery Capacity | 54kWh per tower (6 module slots) |
| Battery Chemistry | Lithium Iron Phosphate (LFP) |
| Usable Capacity | 97% DoD (5.84kWh usable from BAT-6.0, 8.76kWh from BAT-9.0) |
| EV Charging | AC (7kW) + DC (12.5–25kW), V2G, V2H |
| AI Management | Yes — weather, usage, tariff optimisation |
| Battery Warranty | 10 years |
| Inverter Warranty | 10 years |
| Gateway Warranty | 5 years |
Sigenergy Battery Price UK
Sigenergy battery price in the UK depends on the battery capacity and inverter size you choose. Here are typical installed prices from UK solar installers:
| Configuration | Battery | Inverter | Estimated Price (installed) |
|---|---|---|---|
| Starter | 6kWh (1 × BAT-6.0) | 5kW | £3,500–£4,500 |
| Standard | 9kWh (1 × BAT-9.0) | 8kW | £4,500–£6,000 |
| Popular | 12kWh (2 × BAT-6.0) | 10kW | £5,500–£7,000 |
| Large Home | 18kWh (2 × BAT-9.0) | 10kW | £7,500–£9,600 |
| Maximum | 54kWh (6 × BAT-9.0) | 12kW | £17,000–£21,000+ |
Prices are approximate and vary by installer. The Sigenergy inverter price is included in the system cost above — you don't buy the inverter separately. Adding the Sigenergy DC EV charging module typically costs from £3,500 extra. All prices include 0% VAT (available on solar and battery installations until March 2027).
Sigenergy Battery Sizes & Dimensions
Sigenergy batteries are stackable LFP modules. You start with one module and add more as your needs grow. The two module sizes (BAT-6.0 and BAT-9.0) can be combined to hit common UK home capacities of 5kWh, 8kWh, 10kWh, 12kWh, 18kWh and beyond.
| Common search | Sigenergy module | Nominal capacity | Usable (97% DoD) |
|---|---|---|---|
| Sigenergy 5kWh battery | 1 × BAT-6.0 | 6.0kWh | 5.84kWh |
| Sigenergy 8kWh battery | 1 × BAT-9.0 | 9.0kWh | 8.76kWh (closest match) |
| Sigenergy 10kWh battery | 2 × BAT-6.0 (stacked) | 12.0kWh | 11.68kWh |
| Sigenergy 10kW battery | 2 × BAT-6.0 + 10kW inverter | 12.0kWh | 11.68kWh |
| Sigenergy 12kWh battery | 2 × BAT-6.0 | 12.0kWh | 11.68kWh |
| Sigenergy 18kWh battery | 2 × BAT-9.0 | 18.0kWh | 17.52kWh |
| Sigenergy 24kWh battery | 4 × BAT-6.0 | 24.0kWh | 23.36kWh |
| Sigenergy 36kWh battery | 4 × BAT-9.0 | 36.0kWh | 35.04kWh |
| Sigenergy 54kWh battery | 6 × BAT-9.0 (max tower) | 54.0kWh | 52.56kWh |
Note: people often search “Sigenergy 10kW battery” when they mean a 10kW inverter paired with a battery (Sigenergy uses kW for inverters and kWh for battery capacity). The closest direct match is the 12kWh stack with the 10kW hybrid inverter.
Sigenergy battery dimensions
| Component | Dimensions (W × D × H) | Weight |
|---|---|---|
| BAT-6.0 module (6kWh) | 625 × 270 × 207 mm | ~63 kg |
| BAT-9.0 module (9kWh) | 625 × 270 × 297 mm | ~91 kg |
| SigenStor inverter (5–12kW) | 625 × 270 × 308 mm | ~36 kg |
| Gateway | 625 × 270 × 90 mm | ~10 kg |
| Full 18kWh tower (2 × BAT-9.0 + inverter + gateway) | 625 × 270 × ~995 mm | ~228 kg |
Dimensions are from the Sigenergy SigenStor datasheet. All modules share the same 625 × 270 mm footprint, so the system stacks vertically and only requires a single wall location. IP66 rating means it can be installed indoors or outdoors.
Sigenergy Gateway: What Does It Do?
The Sigenergy gateway is the communication hub of the SigenStor system. It connects the hybrid inverter, battery modules, and EV charger to your home Wi-Fi and the Sigenergy cloud platform.
System Monitoring
The gateway reports real-time data on solar generation, battery charge level, grid import/export, and EV charging status to the Sigenergy app on your phone.
AI Optimisation
The gateway runs the AI energy management algorithms, pulling weather forecasts and electricity tariff data to optimise when to charge, discharge, or export.
Firmware Updates
Over-the-air updates keep your system current with new features and performance improvements. The gateway handles all updates automatically.
The Sigenergy gateway is included with every SigenStor system — it is not sold separately. The gateway price is bundled into the total system cost. It carries a 5-year warranty (shorter than the 10-year battery and inverter warranty).
Sigenergy App: Monitor & Control Your System
The Sigenergy app (available on iOS and Android) gives you full visibility and control over your SigenStor system from your phone.
What You Can See
- • Real-time solar generation (kW)
- • Battery charge level and state of health
- • Grid import/export in real time
- • EV charging session status and history
- • Daily, weekly, and monthly energy reports
- • Estimated savings and self-consumption ratio
What You Can Control
- • Switch between AI auto, self-consumption, or time-of-use modes
- • Set battery charge/discharge schedules
- • Start/stop EV charging remotely
- • Set EV charge limits and departure times
- • Enable/disable grid export
- • View and update firmware via gateway
How Sigenergy Is Installed
Sigenergy installation must be carried out by a trained, MCS-certified installer. MCS certification is required for the system to qualify for Smart Export Guarantee (SEG) payments and 0% VAT.
Day 1 — Solar & Inverter
Solar panels are mounted and wired to the SigenStor hybrid inverter. The inverter is fixed to a wall (interior or exterior, IP66 rated).
Battery & Gateway
Battery modules stack onto the inverter base. The gateway sits on top, connecting everything to your Wi-Fi and the Sigenergy cloud. No separate hub or BMS box required.
Commissioning & G99
Installer registers the system with MCS, applies for DNO approval (G98 for systems ≤3.68kW per phase, G99 above) and submits the SEG application to your chosen energy supplier.
Most domestic Sigenergy installations are completed in 1–2 days for solar + battery, or 2–3 days if the DC EV charger module is included. The system supports retrofitting to existing solar arrays — you don't need to replace your panels.
Sigenergy installers in the UK are typically also certified for EV charger installation (OZEV-approved), which simplifies the project if you're adding the DC EV charging module at the same time.
Sigenergy with Home Assistant
Sigenergy supports integration with Home Assistant via Modbus TCP, so you can pull live data into your smart-home dashboard alongside other devices (heat pumps, EV chargers, smart meters, octopus tariffs).
What you can read
- • Solar PV generation (per MPPT and total)
- • Battery state of charge, power flow, temperature
- • Grid import/export power and energy
- • EV charging session status and energy
- • Inverter status, faults, and firmware version
What you can write
- • Switch operating mode (self-use / TOU / backup)
- • Force charge or discharge battery on schedule
- • Cap grid import or export power
- • Trigger EV charging start/stop
The community-maintained sigenergy2mqtt and HACS integrations expose every Modbus register the gateway publishes. You will need the gateway's local IP address and Modbus enabled by your installer at commissioning (usually a checkbox in the installer app).
Home Assistant integration is unofficial — Sigenergy don't support it directly — but the Modbus protocol is documented and stable. Most UK Sigenergy owners use it to drive automations against Octopus tariffs like Agile and Intelligent Flux.
Sigenergy Login & Technical Support
Sigenergy login
Homeowners log in to the mySigen app (iOS / Android) using the email address registered at commissioning. Installers use the separate SigenCloud portal for fleet management and remote diagnostics.
If you bought a Sigenergy system from a previous owner, ask your installer to transfer ownership in SigenCloud — you can't do this yourself from the homeowner app.
Sigenergy technical support UK
First line support is your installer — they can pull diagnostics through SigenCloud and reach Sigenergy direct. For warranty claims, your installer raises the ticket on your behalf.
Sigenergy run a UK/EMEA support team reachable via the contact form on sigenergy.com/support. Response times are typically 1–3 working days for non-urgent queries.
AI Energy Management: How It Works for UK Homes
Sigenergy's AI software automatically manages your energy to maximise savings. It learns your usage patterns and optimises based on:
Self-Consumption
Stores excess solar during the day and releases it in the evening when you need it. Maximises the amount of free solar electricity you use directly.
Time-of-Use Tariffs
With a smart meter, time-of-use tariffs like Octopus Agile or E.ON Next Flex let you pay less for off-peak electricity. The AI charges from the grid when electricity is cheap and uses stored energy during peak hours.
Export Management
Manages Smart Export Guarantee (SEG) payments by deciding when to export surplus solar vs when to store it for later self-consumption. Best SEG rates pay up to 24p/kWh.
Sigenergy vs Tesla Powerwall: Which Is Better?
| Feature | Sigenergy SigenStor | Tesla Powerwall 3 |
|---|---|---|
| Battery Capacity | 6kWh–54kWh (stackable) | 13.5kWh (fixed) |
| Expandable | Yes (add modules) | Limited (add units) |
| Built-in Inverter | Yes (up to 12kW) | Yes (11.5kW) |
| EV Charging | Built-in AC + DC, V2G | No (separate charger needed) |
| AI Management | Yes | Yes |
| Battery Chemistry | LFP | LFP |
| Warranty | 10 years | 10 years |
| Price (approx.) | £4,500–£9,600+ | £7,000–£9,000 |
Verdict: Sigenergy wins on flexibility (stackable capacity) and integrated EV charging. Tesla wins on brand recognition and proven track record. For UK homes with EVs, Sigenergy's built-in V2G charging is a genuine differentiator.
Known Issues
In 2025, Sigenergy's single-phase 8/10/12kW inverters experienced overheating issues in Australia, prompting an ACCC recall. Sigenergy launched a replacement programme with redesigned inverters. If considering Sigenergy, ask your installer about the revised models and confirm you are receiving the updated hardware.
Sigenergy: Frequently Asked Questions
What is Sigenergy SigenStor?
SigenStor is an all-in-one solar energy system combining a hybrid inverter, stackable LFP battery storage (6kWh to 54kWh), and built-in EV charging with AI energy management. It works with any brand of solar panels.
Is Sigenergy available in the UK?
Yes. Sigenergy has a growing network of MCS-certified installers across the UK. Ask your solar installer if they can supply and install SigenStor systems.
Sigenergy vs Tesla Powerwall: which is better?
Sigenergy offers better flexibility (stackable 6–54kWh vs Tesla's fixed 13.5kWh) and built-in EV charging with V2G. Tesla has stronger brand recognition and a longer track record. Both use LFP chemistry and 10-year warranties.
How much does Sigenergy cost in the UK?
A SigenStor system typically costs £4,500–£9,600+ depending on battery capacity and inverter size. A 12kWh system with inverter costs approximately £5,500–£7,000 installed. 0% VAT applies until March 2027.
Does Sigenergy include EV charging?
Yes. SigenStor includes built-in AC and DC EV charging with vehicle-to-grid (V2G) and vehicle-to-home (V2H) capability. This is unique — most competitors require a separate EV charger.
What battery chemistry does Sigenergy use?
Sigenergy uses LFP (Lithium Iron Phosphate) battery chemistry, which is the safest and most durable lithium battery type. LFP lasts longer and has lower fire risk than NMC alternatives.
How much does a Sigenergy 9kWh battery cost in the UK?
A Sigenergy 9kWh battery (BAT-9.0) with hybrid inverter typically costs £4,500–£6,000 installed in the UK. This includes the gateway and basic installation. Adding the DC EV charging module costs from £3,500 extra.
How much does a Sigenergy 12kWh system cost?
A Sigenergy 12kWh system (2× BAT-6.0 modules) with a 10kW inverter typically costs £5,500–£7,000 installed. This is one of the most popular configurations for UK homes with solar panels.
What is the Sigenergy gateway?
The Sigenergy gateway is the communication hub that connects your inverter, battery, and EV charger to your Wi-Fi and the Sigenergy cloud. It runs the AI energy management and handles firmware updates. It's included with every SigenStor system (5-year warranty).
Is there a Sigenergy app?
Yes. The Sigenergy app (iOS and Android) lets you monitor real-time solar generation, battery level, grid usage, and EV charging. You can also control charging schedules, switch between AI modes, and start/stop EV charging remotely.
Does Sigenergy have a car charger?
Yes. The SigenStor includes a built-in EV car charger supporting both AC and DC charging. It also supports vehicle-to-grid (V2G) and vehicle-to-home (V2H), meaning your car battery can power your home during peak hours.
What is the Sigenergy inverter price?
The Sigenergy hybrid inverter is not sold separately — it's included in the SigenStor system price. A system with a 5kW inverter starts from approximately £3,500 installed; a 10kW inverter system from approximately £5,500.
Do I need MCS certification for Sigenergy?
Your installer should be MCS-certified. MCS certification is required to be eligible for Smart Export Guarantee (SEG) payments, which let you earn money by exporting surplus solar electricity to the grid.
What sizes does the Sigenergy battery come in?
Sigenergy batteries are stackable LFP modules: BAT-6.0 (6kWh nominal, 5.84kWh usable) and BAT-9.0 (9kWh nominal, 8.76kWh usable). Stack from 6kWh up to 54kWh per tower. Common UK configurations are 12kWh (2× BAT-6.0) and 18kWh (2× BAT-9.0).
What are the dimensions of a Sigenergy battery?
Each battery module is 625mm wide × 270mm deep. The BAT-6.0 is 207mm tall (~63kg) and the BAT-9.0 is 297mm tall (~91kg). All modules share the same footprint and stack vertically with the inverter and gateway, requiring just one wall location.
How much does a Sigenergy 10kW battery cost?
The 'Sigenergy 10kW battery' usually refers to a 10kW hybrid inverter paired with a battery stack — typically 12kWh (2× BAT-6.0) for £5,500–£7,000 installed. Sigenergy specifies inverters in kW and batteries in kWh, so the closest direct match is the 10kW + 12kWh configuration.
How much does a Sigenergy 5kWh battery cost?
The closest Sigenergy battery to 5kWh is a single BAT-6.0 module (5.84kWh usable). With the 5kW hybrid inverter, this 'starter' configuration costs approximately £3,500–£4,500 installed in the UK.
How much does a Sigenergy 8kWh battery cost?
The Sigenergy BAT-9.0 (8.76kWh usable) with the 8kW hybrid inverter costs approximately £4,500–£6,000 installed in the UK. This is the closest match to the '8kWh' search and is one of the most popular configurations for 3-bed UK homes.
Does Sigenergy work with Home Assistant?
Yes. Sigenergy gateways expose Modbus TCP, so community-maintained Home Assistant integrations (sigenergy2mqtt, HACS) can read solar, battery, grid and EV charging data and write operating mode, force-charge schedules and import/export caps. Modbus must be enabled by your installer at commissioning.
Where do I log in to Sigenergy?
Homeowners log in to the mySigen app (iOS/Android) with the email registered during installation. Installers use the SigenCloud portal at sigenergy.com for fleet management. There is no separate homeowner web login — the app is the primary interface.
How do I get Sigenergy technical support?
First line support is your MCS installer — they can pull diagnostics via SigenCloud and raise warranty tickets on your behalf. For direct queries, contact Sigenergy via sigenergy.com/support; response times are typically 1–3 working days.
How long does Sigenergy installation take?
A typical Sigenergy solar + battery installation is completed in 1–2 days by an MCS-certified installer. Adding the DC EV charging module extends this to 2–3 days. The system can also be retrofitted to existing solar arrays without replacing your panels.
Where can I find the Sigenergy datasheet?
The full Sigenergy SigenStor datasheet (covering the hybrid inverter, BAT-6.0 and BAT-9.0 modules, gateway and EV charging module) is available on sigenergy.com under the SigenStor product page. Your installer will provide the relevant pages with your quote.
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Sources
- Sigenergy — SigenStor Product Range — sigenergy.com
- SunWiz — Australian Battery Market Report 2025 — sunwiz.com.au
- MCS — Microgeneration Certification Scheme — mcscertified.com
Last updated: May 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
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