SigenStor: specifications, sizes and price

What the SigenStor 5-in-1 actually is

Most home-energy upgrades bolt a battery and an EV charger onto an existing solar inverter, leaving a wall of separate boxes that were never engineered to work together. The SigenStor takes the opposite approach: it integrates five functions into a single stackable tower, so there is less wall equipment, a cleaner install and one coordinated system rather than three products from three manufacturers talking to each other over the cloud.

Ecoaim came to Sigenergy after years installing the EcoFlow ecosystem — the SigenStor is the natural upgrade for Scottish homeowners who want whole-home electrification (solar, battery, heat pump and EV) on one platform, with the AI energy management to make it actually save money on a time-of-use tariff. We design and specify each SigenStor from our Livingston base, supplied direct by sigenergy uk platinum distributor.

The five units in one tower

SigenStor key specifications

Figures below are Sigenergy's own published specifications, read from the manufacturer's SigenStor specifications page on 25 September 2026. Exact inverter power, battery capacity and whether the EV DC charger module is fitted are all set at design stage to suit your property and supply — and if a quote you are comparing shows different module sizes, it is quoting an earlier generation.

Three-phase power and integrated EV DC charging

One of the SigenStor's strongest cards in Scotland is its range. The single-phase variant covers terraced and semi-detached homes from 3 to 12 kW, while the three-phase variant scales to roughly 25 kW — which matters around Edinburgh, Livingston and Stirling, where larger detached homes often have a three-phase supply that a single-phase-only battery simply cannot serve.

The optional integrated EV DC charger is the other differentiator. Rather than installing a separate charge-point cabinet on a second visit, the SigenStor can take a bi-directional EV DC module inside the tower. For households that prefer standalone AC charging, the Sigen EV AC Charger pairs natively with the same EMS — Ecoaim advises which route fits your vehicle and goals at survey.

EPS backup — staying powered through a Scottish power cut

The SigenStor provides EPS (Emergency Power Supply) backup with a 0 ms / sub-millisecond switchover, so supported circuits stay live through a grid outage. In storm-exposed parts of Scotland — where winter power cuts still happen — that is a genuinely useful feature rather than a spec-sheet line. The exact backup scope (whole-home or essential circuits) is set when we design your system.

mySigen and Sigen.AI — the intelligence layer

The SigenStor is monitored and scheduled from the mySigen app, and its Sigen.AI energy management continuously optimises when the system charges and discharges against your electricity tariff — for example charging the battery on cheap overnight or surplus-solar energy and discharging at peak. On a time-of-use tariff such as Octopus Flux, this automated arbitrage is where the real savings are made, without the household having to manage anything manually. Ecoaim configures the tariff strategy at commissioning.

Why the SigenStor suits Scottish Central Belt homes

The SigenStor suits Central Belt homes pursuing whole-home electrification — solar, battery, heat pump and EV on one coordinated system. The three-phase variant fits the larger detached homes around Edinburgh, Livingston and Stirling where three-phase supplies are common and a single-phase-only battery cannot serve the load. Ecoaim designs and installs from our Livingston EH54 base, supplied direct by SigEnergy's UK Platinum Distributor.

SigenStor price in Scotland

SigenStor battery from ~£2,500 per 5 kWh (ex-install); EV DC charger module from ~£3,500. Full installed price quoted on survey. 0% VAT until 31 March 2027. Because the SigenStor is configurable — inverter size, how many battery modules you stack, and whether the EV DC charger is fitted — the only accurate figure is a quote against your actual roof, supply and tariff. Ecoaim returns an itemised, fixed price in writing after a free survey.

Pricing reflects current manufacturer guidance and is indicative only; installed cost depends on specification, scaffolding, electrical works and your DNO requirements. 0% VAT applies to qualifying domestic installations until 31 March 2027.

Why specify the SigenStor with Ecoaim

• Sigenergy-certified installer — Ecoaim is a Sigenergy-certified installer, MCS-certified, based in Livingston, EH54.
• Platinum-Distributor-supplied — systems are supplied direct by sigenergy uk platinum distributor, not sourced through a chain of resellers.
• Among the first in Scotland to specify the SigenStor — design and install experience with the platform, not a first-timer learning on your roof.
• Design-led — we lead with design and install expertise, building on our EcoFlow-to-Sigenergy upgrade journey.
• Scotland-wide coverage — Central Belt focus from Edinburgh to Glasgow, plus the wider UK.

What the specification actually means in a house

Specification sheets are written for installers. Here is what the four figures that matter translate to when the system is on your wall.

• Modules of 6.02 or 9.04 kWh, one to six per controller. That is the real sizing ladder: roughly 6 kWh at the bottom and about 54 kWh at the top of a single tower. It matters because you can start at the size your usage justifies and add a module later, rather than buying capacity you cannot fill. Our solar battery size calculator works out which rung you need from your own evening usage.
• Inverter output of 3–12 kW single-phase or 5–30 kW three-phase. This is the tap, not the tank: it caps how fast the system can charge or discharge. A large battery behind a small inverter cannot empty itself into a three-hour peak window, which is exactly what a time-of-use tariff asks it to do.
• 100% depth of discharge. Sigenergy publishes the full capacity as usable, so a 9.04 kWh module is 9.04 kWh you can draw — worth checking against any battery quoted at a nominal figure with a lower usable number buried in the datasheet.
• An optional 25 kW bi-directional DC charging module. This is the part with no equivalent in a conventional battery: the EV charges from DC solar and battery power directly, and Sigenergy lists the platform as V2H and V2G ready, so the car can eventually back up the house.

Buying a SigenStor: box price versus installed price

Search for the SigenStor and most of the first page is the manufacturer and online retailers selling modules by the kWh. That is a fair way to see component prices, and a poor way to buy an energy system — because the parts that decide whether it earns anything are not in the box.

An installed price covers the design against your supply and usage, the G99 application to your network operator (SP Energy Networks across the Central Belt), the electrical work and backup wiring, MCS certification so you can claim Smart Export Guarantee payments, commissioning with the tariff windows actually set, and a workmanship warranty from the company that did the work. Ecoaim's battery modules start at about £2,500 each ex-install, the EV DC module from about £3,500, and full systems typically land between roughly £8,000 and £35,000 fitted, with 0% VAT on domestic installations until 31 March 2027. If you are weighing it against the best-known alternative, our Sigenergy vs Tesla Powerwall 3 comparison puts both manufacturers' published figures side by side.

The figures behind this page

SigenStor — frequently asked questions