Sigenergy SigenStor Installation in Doncaster & South Yorkshire

As a guide for 2026: a battery-only retrofit of around 5–10kWh usable typically comes in at roughly £4,500–£7,000, and 10–20kWh at roughly £5,500–£9,500, both at 0% VAT (a rate that runs until 31 March 2027). Around 18kWh with the whole-home backup Gateway starts from about £9,600. These are honest ranges, not fixed prices — the final figure depends on your property and module count, which is why we quote after a free survey.

The system stacks in modules — the current BAT 6.0 gives 5.84kWh usable and the BAT 10.0 gives 8.76kWh usable — and most UK homes run one to three modules, around 6–26kWh usable. A couple with modest evening use might start with a single module; a family home with an EV or heat pump often suits two or three. Because modules click together, you can start smaller and add capacity later without replacing the inverter.

Battery modules and the Energy Controller carry a 10-year warranty guaranteeing at least 70% of usable capacity, capped by a minimum energy throughput per module — whichever comes first. The LFP cells are manufacturer-rated for up to 10,000 cycles, but that is a cell rating, not the warranty term. One honest flag: some UK documentation cites a shorter warranty (around 3 years) on the optional DC EV charging module, so we confirm current terms for that module before you order.

No — that is one of its biggest advantages. The Sigen Energy Controller head unit is itself a hybrid inverter (single-phase 3–12kW, three-phase up to 30kW, with up to 4 MPPTs on larger models), so the stack combines solar inverter, battery power electronics, storage modules and energy management in one unit. It can also AC-couple to an existing solar array, so it works as a retrofit if you already have panels with their own inverter.

It can, with one honest caveat: seamless whole-home backup with 0ms switchover needs the separate Sigen Energy Gateway, which is an extra-cost item rather than standard with the base stack. With the Gateway fitted, the system takes over instantly in an outage and can deliver 200% surge output for 10 seconds to handle motor start-ups. Without it, you should not expect whole-home backup. We price the Gateway option clearly in every quote.

Yes. The mySigen app and built-in energy management integrate with UK smart tariffs, including Octopus tariffs such as Intelligent Octopus Flux, automating cheap-rate charging and higher-rate export around your usage. Through winter, when solar output is low, the battery can charge overnight on cheap rates and discharge through the expensive peak — so it earns its keep year-round, not just in summer.

It is a newer name and we say so plainly: Sigenergy was founded in 2022 and entered the UK market in late 2023, so its UK track record is shorter than longer-established brands. Against that, it has scaled remarkably — a reported 28.6% share of the global stackable all-in-one storage segment in 2024 (per SunWiz), second place in the UK 2025 Installers' Choice Awards, and stock at major national wholesalers including Segen and Midsummer. The 10-year warranty and LFP chemistry are competitive with any mainstream rival.

Optionally, yes — and this is unique among mainstream home batteries. A 25kW DC EV charging module can be added to the stack (typically £3,500–£4,000 extra installed), charging several times faster than a standard 7kW wallbox. The hardware is bidirectional (V2H/V2G-capable), though vehicle-to-grid in practice still depends on a compatible EV, DNO approval and tariff support, which remain early-stage in the UK.