SigEnergy SigenStor 2026: 5-in-1 Battery Explained
What the SigEnergy SigenStor is, how the 5-in-1 stack works, sizes, three-phase, built-in EV charging and warranty — from Scotland's SigenStor specialist installer.
Quick answer
The SigEnergy SigenStor is a 5-in-1 home and light-commercial energy system that combines the solar inverter, battery, power conversion, AI energy management and an optional built-in EV DC charger in one stackable tower. It comes in single-phase (3.6–12kW) and three-phase (5–~25kW) forms, uses LFP battery chemistry, and scales from a modest stack up to roughly 48kWh per tower by adding modules over time. That all-in-one design — rather than a wall of separate boxes — is what sets it apart from conventional home batteries. As a Sigenergy-certified installer and a SigenStor installer in Scotland, Ecoaim designs, installs and commissions the platform to suit your roof, your supply phase and your EV plans. Below we explain exactly how the SigenStor is built, the sizes and options, where it shines, and how to get one specified properly.
What is the SigEnergy SigenStor?
The SigenStor is SigEnergy's flagship residential and small-commercial storage platform, and its defining idea is integration. A traditional solar-plus-battery setup is a collection of separate products: a hybrid inverter, one or more battery cabinets, a separate EV charger, and an app to tie them together. The SigenStor folds five of those functions into a single, modular tower:
1. PV inverter — converts DC from your solar panels to usable AC
2. Battery — stackable LFP modules that store surplus generation
3. Power conversion system — manages charge and discharge efficiently
4. AI energy management (EMS) — optimises when to store, use, export or charge an EV against your tariff
5. Optional EV DC charger — a bi-directional charging module that stacks into the same tower
The practical upshot is fewer separate units on the wall, one coherent app, and a system you can expand without re-engineering. All figures in this guide reflect SigEnergy's published specifications; your installer will confirm the exact spec for your property.
How the 5-in-1 stack works
The SigenStor is physically a vertical stack. The base unit houses the inverter and power-conversion electronics; battery modules clip on top; and the optional EV charger module integrates into the same structure. Because it is modular, the system is sized to your needs rather than sold as a fixed box:
- LFP battery modules — commonly 5.2kWh and 8.0kWh units — stack to roughly 48kWh per tower
- System round-trip efficiency of around 93–95%, so little energy is lost in the store-and-release cycle
- IP66 rating, meaning it is built to sit outdoors in Scottish weather
- EPS (emergency power supply) backup with sub-millisecond switchover, so essential circuits stay live through a grid dip
- AI EMS that coordinates solar, battery, grid import/export and EV charging automatically against a tariff such as Octopus Flux
Because every element talks to the same controller, the SigenStor can do things a bolted-together system struggles with — for example, prioritising charging your EV from surplus solar, then topping the home battery, then exporting only the genuine surplus at the best moment.
SigenStor sizes, options and specifications
Here is the platform at a glance. Treat these as the structural specification; your installer confirms the precise modules and ratings for your home.
| Specification | SigEnergy SigenStor |
|---|---|
| Configuration | 5-in-1 stackable tower: inverter, battery, power conversion, AI EMS, optional EV DC charger |
| Single-phase inverter | 3.6–12kW |
| Three-phase inverter | 5–~25kW |
| Battery modules | LFP, ~5.2kWh / ~8.0kWh, stackable to ~48kWh per tower |
| Battery chemistry | LFP (LiFePO4) — safe, long-cycle, no cobalt |
| Round-trip efficiency | ~93–95% |
| Ingress protection | IP66 (outdoor-rated) |
| Backup | EPS with sub-millisecond switchover |
| EV charging | Optional integrated bi-directional DC charger module |
| Warranty | ~10 years (confirm current terms at quote) |
| VAT | 0% on qualifying residential installs until 31 March 2027 |
Single-phase vs three-phase SigenStor — which do you need?
This is the question that most often decides the configuration, so it is worth understanding before you get a quote.
| Factor | Single-phase SigenStor | Three-phase SigenStor |
|---|---|---|
| Inverter range | 3.6–12kW | 5–~25kW |
| Best for | Most standard 3–5 bedroom homes on a single-phase supply | Larger detached homes, rural properties, small commercial units with a three-phase incomer |
| EV + heat pump headroom | Good for one major load | Comfortable for high-power EV charging plus a heat pump |
| Typical Scottish fit | The majority of Central Belt homes | Bigger or rural properties, light commercial |
Most homes are single-phase and the single-phase SigenStor covers them well. The three-phase version earns its place where you already have — or are moving to — a three-phase supply and want to run heavier combined loads without straining a single phase. Checking your supply and your future load (EV, heat pump, extension) is part of the SigenStor installer in Scotland survey we run before quoting.
Where the SigenStor is the right choice
The SigenStor is built around integration and headroom. It is the strongest fit when:
- You have, or are moving to, a three-phase supply. It handles 5–~25kW three-phase from the same platform, which single-phase-only home batteries cannot match.
- An EV is in your future. The optional built-in bi-directional EV DC charger means adding charging is a module in the existing tower, not a second cabinet and another install day.
- You want one integrated system. Inverter, battery, conversion, AI EMS and EV charging in a single stack means fewer products, less wall space and one app.
- You want to start sensibly and expand. Stackable modules let you grow capacity up to ~48kWh as your savings prove out.
- Resilient backup matters. Sub-millisecond EPS switchover is genuinely useful in exposed parts of Scotland where grid dips are more common.
If your needs are simpler — a standard single-phase home with no EV or three-phase on the horizon — a conventional home battery such as the EcoFlow PowerOcean may give you better value, and we fit those too. Our EcoFlow vs SigEnergy comparison walks through that decision in detail.
SigenStor and your solar + tariff economics
A battery only pays its way if it is charged cheaply and discharged (or exported) when power is expensive. The SigenStor's AI EMS is designed for exactly that, and it works best paired with a time-of-use tariff. On Octopus Flux, for example, you import cheaply overnight, run the house on stored energy through the expensive evening peak, and export genuine surplus when the export price is highest. See our battery storage overview for how storage fits the wider system, and our Octopus Flux + battery maths for a worked Scottish example of the numbers.
Two things to keep in mind on economics:
1. Self-consumption beats export. Avoiding electricity you would otherwise buy at 28–30p/kWh is worth far more than exporting at single-digit-to-mid rates, so the system should be sized to your real daytime and evening use.
2. MCS certification is non-negotiable for SEG. Only an MCS-certified install qualifies for Smart Export Guarantee payments. MCS standards are published by mcs.co.uk, and the Energy Saving Trust is a useful independent reference on how storage and tariffs interact.
Buying and installing a SigenStor in Scotland
Because the SigenStor is a stackable, configurable platform, a proper survey matters more than with a fixed-box battery. When Ecoaim specifies a SigenStor we check:
- your supply phase (single- or three-phase) and DNO connection
- your existing or planned solar array and how the inverter is sized to it
- your consumer unit and whether any upgrade is needed
- your real electricity use across the day and evening, to size capacity sensibly
- your EV and heat-pump plans, so the tower has the right headroom from day one
Ecoaim is Scotland's SigEnergy specialist installer and among the first in Scotland to specify the SigenStor, with stock supplied direct by SigEnergy's UK Platinum Distributor. We are also arranging a mobile show-stand sales tour with the Platinum Distributor so customers can see the platform in person before they commit — get in touch to be notified of dates. If you currently run an EcoFlow system and your needs have grown, our upgrade from EcoFlow to SigEnergy guide explains how the migration works, and our SigEnergy installer Scotland hub covers the platform in full.
Bottom line
The SigEnergy SigenStor is a 5-in-1 stackable energy system — inverter, battery, power conversion, AI energy management and optional EV charging in one expandable tower — available in single-phase and three-phase forms and scalable to roughly 48kWh. It is the standout choice when you need three-phase power, integrated EV charging, or a single all-in-one system you can grow over time; a simpler single-phase home may be better served by a conventional battery, and we fit both. As a Sigenergy-certified, MCS-registered SigenStor installer in Scotland, Ecoaim sizes and installs the platform around your property and quotes a fixed price with the real numbers. Book a free survey and we will tell you honestly whether a SigenStor pays its way for your home.
Sources and further reading
- SigEnergy — SigenStor product specifications — sigenergy.com
- Microgeneration Certification Scheme (MCS) — mcs.co.uk
- Energy Saving Trust (DESNZ delivery partner) — energysavingtrust.org.uk
Related Ecoaim guides:
Frequently asked questions
What is the SigEnergy SigenStor? +
The SigenStor is SigEnergy's 5-in-1 home and light-commercial energy system. A single stackable tower combines the solar PV inverter, the battery, the power conversion system, an AI energy-management controller and an optional bi-directional EV DC charger. Instead of bolting together separate boxes for each function, the SigenStor delivers them in one cabinet that you can expand module by module. It uses LFP (lithium iron phosphate) battery chemistry and is available in both single-phase and three-phase forms.
What sizes does the SigenStor come in? +
The battery is built from stackable LFP modules — commonly 5.2kWh and 8.0kWh units — that stack up to roughly 48kWh per tower, so you can start with a sensible capacity and add modules as your savings prove out. On the inverter side it spans single-phase 3.6–12kW and three-phase 5–~25kW from the same platform. The right size depends on your roof, your daily electricity use and whether you are adding an EV or a heat pump, which is exactly what an installer survey is for.
Does the SigenStor support three-phase power? +
Yes. The SigenStor is offered in single-phase (3.6–12kW) and three-phase (5–~25kW) versions from the same product family. Three-phase matters for larger detached homes, rural properties and small commercial units in Scotland that already have a three-phase incomer, and it gives you the headroom to run high-power EV charging and a heat pump without straining a single-phase supply.
Can the SigenStor charge an electric car? +
Yes — optionally. The SigenStor offers a bi-directional EV DC charger module that stacks into the same tower, so EV charging becomes part of the storage system rather than a separate wall unit, a second consumer-unit feed and another install visit. Bi-directional means the platform is also designed for future vehicle-to-home use as that technology matures. If an EV is on your horizon, the integrated path is one of the main reasons Scottish customers specify the SigenStor.
What warranty does the SigenStor come with and is there VAT to pay? +
The SigenStor carries a manufacturer warranty of around 10 years (confirm current terms at the point of quote, as warranties are periodically updated). Qualifying residential battery-storage installations in the UK currently benefit from 0% VAT until 31 March 2027 under the government's energy-saving materials relief, which reduces the installed cost. Your installer will confirm both the warranty terms and VAT treatment in your written fixed-price quote.
Who installs the SigEnergy SigenStor in Scotland? +
Ecoaim is a Sigenergy-certified installer and Scotland's SigEnergy specialist installer, working from our Livingston EH54 base across Edinburgh, Glasgow, Falkirk, Stirling, Dunfermline and the wider Central Belt and UK. Our SigenStor stock is supplied direct by SigEnergy's UK Platinum Distributor, and we are among the first in Scotland to specify the platform. We design, install and commission the system end to end, including the DNO notification and MCS certificate you need for SEG export payments.
Duncan leads Ecoaim's technical design and survey team from our Livingston EH54 base, with 10+ years specifying MCS-certified solar PV and battery storage across the Scottish Central Belt. Ecoaim is a Sigenergy-certified installer and among the first in Scotland to specify the SigenStor, supplied direct by SigEnergy's UK Platinum Distributor.
Call 03330 384 380 or get a quote online — survey + quote within 24 hours.