Sigenergy EV charging: SigenStor AC and DC charging modules

Sigenergy is a solar and battery storage company that has built EV charging into its home energy system rather than selling a standalone wallbox. Its SigenStor integrates a solar inverter, a battery, an energy management system and two forms of EV charging, AC and DC, into one product family¹. The DC charging module charges at up to 25kW, which the maker says provides up to 150 km of driving range in one hour, far faster than a typical home wallbox². In the UK the products are sold through Midsummer Wholesale, which matches homeowners with installers, and Alternergy has been Sigenergy's British distribution partner since 2023⁴.

For a household weighing energy independence, the appeal is that the car, the battery and the solar panels share one managed system: surplus solar can charge the car, the home battery can boost charging speed, and in a power cut the car's battery can help keep the house running³. The dependence that remains is real too: the DC module only works with Sigenergy's own Energy Controller, the smart features run through the maker's app and servers, and there is no published UK price, so everything is installer-quoted⁷.

The company behind SigenStor and its chargers

Sigenergy was founded in 2022 by Tony Xu, who remains founder and CEO, and is headquartered in Shanghai¹¹. It is a young company by the standards of the heating and electrical trade, but it has grown quickly: it listed publicly on the Hong Kong Stock Exchange under the code 06656.HK, and by the end of 2025 it operated across 85 countries and regions with 172 distributors and more than 17,600 registered installers worldwide⁸. Its business spans photovoltaic generation, smart energy storage and high-efficiency EV charging, and it reports more than 200,000 installations worldwide⁹.

Manufacturing is at scale. Sigenergy has opened a 136,000 square metre manufacturing campus in Nantong with the capacity to produce up to 300,000 battery packs and inverters a year⁸. The company describes its strategy as "AI in All", and in June 2026 it announced SigenStor Neo, its next-generation all-in-one residential energy storage system¹¹. For a UK buyer, the significance is that this is a large, publicly listed manufacturer, but one with a short track record in the British market, and its UK presence runs through distributors and wholesalers rather than a direct national service network of its own.

SigenStor: five functions in one system

SigenStor is the product the EV charging hangs off. Sigenergy launched it in October 2023 as what it called the world's first 5-in-1 energy storage system, integrating a battery PCS, a battery pack, an EV DC charger, a PV inverter and an energy management system¹⁰. In plain terms, the box on the wall does the solar conversion, stores electricity, manages the home's energy use and charges the car, all through one controller.

The architecture matters for efficiency. Sigenergy uses a DC-coupled design with a direct DC bus connection between the panels, the battery and the EV charger, which the maker says boosts system efficiency and power density because power moves between them without repeated conversion to AC⁴. The system also claims a patented 0ms load side disruption time, meaning the home's supply switches over to battery without an interruption⁴.

For a household, the practical effect is that the car becomes part of the home energy system rather than an appliance plugged into it. The EV DC charging module can draw on the grid and the solar panels simultaneously for the fastest charging, use PV surplus for what the maker calls 100% green power charging, and support scheduled charging start times⁶. The limits are equally clear: the DC module needs to be used together with the Sigen Energy Controller, so it is not a standalone purchase, and the whole arrangement ties the home to one manufacturer's ecosystem of controller, battery and app⁷.

AC and DC charging modules: what each does

Sigenergy offers two ways to charge a car from a SigenStor home, and they suit different households.

The Sigen EV AC Charger is the conventional option. It offers what the maker calls the most diverse charging modes: Sigen AI Mode, Fast Charging, PV Surplus Charging and Battery Boost Charging¹². It charges from solar, the grid and the home battery, smartly uses surplus PV power, and can use the battery to boost charging speed with extra energy¹². It also dynamically adjusts charging power based on household electricity use, though that function needs to be used with a Sigen Power Sensor¹². Remote control, scheduled charging and customised charging all run through the app¹².

The Sigen EV DC Charging Module is the faster, more integrated option. It charges at 25kW across a 150V to 1000V range with what the maker describes as universal EV compatibility, using the CCS2 DC charging interface². It supports Fast Charging, PV Surplus Charging and Battery Boost Charging with a cut-off state-of-charge setting, plus grid charging, and it draws power from the grid and PV simultaneously for the fastest charging speed³. The module uses smart air cooling, supports over-the-air updates and remote diagnostics, and authenticates by RFID card, app or no authentication⁷. Like the AC charger's sensor-dependent features, it must be used with the Sigen Energy Controller⁷.

Which suits which home is mostly a question of what you already have and how fast you need to charge. The AC charger behaves like a capable smart wallbox that happens to be synchronised with SigenStor, and it is the natural choice where the car is parked for hours overnight. The DC module's 25kW matters where a car must be filled quickly, or where the household wants the bidirectional features described below, and it only makes sense as part of a full SigenStor installation.

V2X: which vehicles have been field tested

The DC module is bidirectional, supporting 25kW charging in both directions, and Sigenergy markets it as an EV-Home Energy Bridge². In practice that means three things the maker claims: vehicle-to-home charging, so the EV battery can back up the house; vehicle-to-grid, so the EV battery can share energy with the grid for peak shaving and load balancing; and keeping the home powered during outages when coupled with the EV². The Climate Change Committee defines V2X as allowing electric vehicles to operate bidirectionally, charging from the grid but also discharging to the grid, a building or a home as needed¹⁴, and the Energy Saving Trust describes V2G as a charger that can take energy from the vehicle as well as put it in¹⁵.

The vehicle compatibility picture is the part to treat carefully. Sigenergy publishes a field test table on its DC charger pages, and the recorded entries include a Nomad electric snowmobile tested in August 2025, a Rivian R1S tested in August 2025, an EV6 with a CCS1 interface tested in September 2025, and Xpeng and AITO models including the M9 tested on the GBT charging interface in March 2026³. The maker states plainly that "these test results are independent and have not been recognized or certified by the manufacturer"³. In other words, a listed car has been shown to work in Sigenergy's own testing, but the car maker has not endorsed it, and the GBT and CCS1 interfaces in the test table are not the CCS2 connector used in the UK.

There is also a grid-side condition. Electricity North West notes that chargers with vehicle-to-grid capability must be type tested to EREC G98 specifications to be eligible for connect and notify, the simplified route for notifying a network operator of a new connection¹⁶. A V2G installation is therefore not the same paperwork as an ordinary home charger, and the details are covered in telling the network operator about a home EV charger. For independence, V2X is the strongest version of it: the car's battery becomes household backup, covered further in can an electric car power my house?, but it also depends on the car maker's warranty terms and on the charger maker's uncertified test results.

UK availability: distributors, wholesalers and installers

There are two named routes into Sigenergy products in Britain. Alternergy became Sigenergy's British distribution partner in October 2023, at the launch of SigenStor¹⁰. Midsummer Wholesale sells Sigenergy EV chargers in the UK and, for homeowners, will help find a Sigenergy installer near you by email⁴. Midsummer describes the company as best known for energy storage and solar tech, now bringing the same approach to EV charging⁴.

There is no published UK price for the SigenStor EV charging modules, so costs are installer-quoted after a survey. What a quote should cover is the charging module itself, the Energy Controller it must pair with, and the installation work. On who does the work, the general guidance is consistent: EV chargers should be installed by a registered electrician with experience of this type of installation, and householders are advised to hire an electrician registered with a recognised certification body such as NICEIC¹⁷. There is no official register of home charge devices in the UK, so registration with a certification body and experience with solar and storage systems are the practical checks.

That report is worth reading before purchase, because the Energy Controller is the component the DC charging module depends on. The modification programme is the maker acting on a known issue, which is the responsible response, but it shows the single-controller design concentrates risk in one part.

Scale and standing: what the numbers show

Sigenergy's scale is unusual for a company founded in 2022. By the end of 2025 it had expanded across 85 countries and regions, supported by 172 distributors and more than 17,600 registered installers worldwide, with more than 200,000 installations reported⁹. It is publicly listed in Hong Kong as 06656.HK, headquartered in Shanghai, and manufacturing at a campus in Nantong with capacity for up to 300,000 battery packs and inverters a year⁸.

For context, the UK's public charging network is itself growing fast: Zapmap counted 120,000 public chargers across the UK as of August 2025, with destination chargers alone at 63,630 in August 2026¹⁷. Sigenergy's numbers are global rather than UK-specific, and the company does not publish a UK installation figure in the material available. The standing that matters to a British buyer is therefore the distribution and installer network described above, plus the fact that a listed company's finances are public record.

Support, warranty and learning resources

Sigenergy's support structure for owners has four parts: a Learning Center with courses and tutorials, a warranty section, a download centre and SigenCare⁴. The Sigen EV AC Charger user manual is available through the download centre, with version 02 released in June 2024, and the DC charging module's datasheet covers the operational details, from its CCS2 interface to its welded contactor check⁷. The UK service contact is sigenservice.uk@sigenergy.com, the address given in the official product safety report¹⁹.

On warranty terms, the material available does not state a fixed year figure for the charging modules, so treat any warranty claim an installer makes as something to get in writing. Two maker positions are stated: Sigenergy assumes no product liability or warranty for any third-party accessories used with the charger², and the V2X field test results are independent and not certified by the vehicle manufacturers³. Both shift responsibility towards the choices the householder makes.

If a charger develops a fault, the guidance is to speak to your installer or electrician first to check there is no problem with your equipment, and to stop using a suspect product and report it to the manufacturer or retailer¹⁹. On standards more widely, BSI's Kitemark certification for EV chargers assesses safety, security, quality and reliability²¹, and the BEAMA and GFI guide to electric vehicle infrastructure is written for owners, users, installers, sellers and manufacturers of EV charging products²². Neither certification is confirmed for the Sigen modules in the material available, so ask the installer what the charger has been tested to. The wider rules are covered in EV charge point safety, standards and certification and EV charger cybersecurity, data and remote control, since a system this connected carries both benefits and dependencies.