Plug-In and Balcony Battery Storage in the UK

Plug-in solar arrived in Britain on 27 August 2026. Before that date, UK standards only permitted solar generation that was permanently connected, which meant wiring by a professional; the rules were then revised to allow plug-in kits¹. The government intends the regulations to let households connect plug-in solar of less than 800W without an electrician². But the title of this page contains a catch, and it is worth stating at once: plug-in batteries are a different matter. Electrical Safety First's consumer advice is blunt: "Our advice is: DON'T INSTALL PLUG-IN BATTERY SYSTEMS IN YOUR HOME."³ Plug-in solar panels are legal and on shop shelves; plug-in battery storage is not currently permitted to be connected to a grid-tied home.

So what does exist, and what can a household actually do? A plug-in solar kit is a small array, typically one or two panels with a microinverter, that feeds electricity into your home through an ordinary socket. A plug-in battery would be a storage unit doing the same thing, charged from the panels or the socket. The first half of that pairing is now lawful in the UK; the second half is not, and this page explains both positions: what the kits contain, what they can power, how the grid connection rules work, and where the legal line sits for storage.

Understanding plug-in and balcony storage systems

A plug-in system is defined by how it connects. Instead of a hard-wired inverter fixed to your fuse board by an electrician, the kit's output arrives through a standard British plug in a standard socket. The government framed the change in exactly those terms when it announced that plug-in solar would be made available for the first time in Britain, "so families can buy a low-cost panel straight from a supermarket and set it up on a balcony or in a garden"⁵. The equipment was promised to be available in shops within months and to save people money on their bills⁶.

The idea is imported. Plug-in panels are common in places such as Germany, where people already hang them on balconies, in gardens or on terraces⁷. Britain has followed with its own rulebook rather than importing the German one, and the difference matters: UK supply is built around a specific product specification and a register of compliant kits, described later on this page.

Where does storage fit in? Two separate things get called "plug-in batteries". The first is a solar kit with a battery built in, sold as one product. The second is a standalone battery unit that plugs into a socket to store cheap electricity and discharge it later, the plug-in equivalent of a home battery storage system. Neither is currently lawful to connect in a UK home. Plug-in solar batteries are already being developed for the UK market⁸, so the position may change, but as of the date of this page the only plug-in device a household may legally connect is generation without storage.

Is the plug-in approach right for you?

The plug-in route exists for people who cannot put panels on a roof. Independent guidance says plug-in solar panels are worth strong consideration if you rent your home, live in a smaller home such as a flat, or are unable to afford the cost of a full roof installation⁹. That is the whole point of the category: it removes the two barriers that keep most households out of solar, ownership of a roof and a four-figure installation bill.

The makers have aimed at exactly this group. UKSOL's Plug-In Solar Pro range is described as being for renters and households with balconies, terraces, gardens or other suitable outdoor areas who cannot install a conventional rooftop solar system¹⁰. For a flat-dweller with a south-facing balcony, or a tenant with a small garden, a plug-in kit is the first solar product that is realistically available.

Availability has moved quickly. Major retailers have worked with the UK government on the rollout and plug-in solar panels are now available to buy in stores and online¹¹, with kits expected at Lidl, Amazon, B&Q, Currys and Screwfix⁸. UKSOL kits are also available online at Argos¹. One honest caveat on the "balcony" label: current devices available in the UK are generally more suitable for garden locations than balconies¹¹, because a garden panel can sit on a frame on the ground while a balcony panel needs fixings, anchors and, usually, a landlord's permission.

For renters there is also an electrical-safety backdrop. Guidance on electrical safety standards in the private and social rented sectors applies to England¹², and any socket a plug-in kit feeds is expected to be part of a safe installation. That is covered in the installation section below.

What plug-in systems can run, and their limits

The ceiling is set by regulation, not by the weather. UK-compliant plug-in solar devices are limited to a maximum output of around 800W¹³, and the government's intended rule is that anything under 800W may be connected without an electrician². Within that ceiling, 800W is enough for everyday appliances, but higher-use appliances will still need grid electricity¹³.

In practice that means the kit runs whatever happens to be on at the moment the sun is shining: LED lights, a television, a laptop, a broadband router, a fridge's compressor cycling on and off. What it will not do is run a whole house. Energy Saving Trust answers the question directly: "Probably not. UK-compliant plug-in solar devices are limited to a maximum output of around 800W."¹³ An electric shower, a heat pump, an EV charger or a kettle draw more than the entire kit's output on their own, so those stay on grid supply.

Without storage, the match has to be live. A plug-in solar kit has no battery, so electricity is used as it is generated or it flows out through the meter. A household that is out all day gets less benefit than one at home in the afternoon. That is the gap a plug-in battery would fill, and it is why the storage question matters so much to this category: the restriction on plug-in batteries removes the one feature that would let a small array serve evening demand. A hard-wired battery, sized properly, is the lawful alternative, and a typical home system might be 10 kWh⁴.

Main parts: panels, microinverters and mounting

Every compliant kit is built from the same three parts: panel or panels, a microinverter, and a mounting system. The government's Interim Product Specification "covers both electrical design, British plug requirements, mounting systems and fire protection"¹⁴, so each element is regulated, not just the panel.

The microinverter is the heart of the kit. It converts the panel's direct current into mains-compatible alternating current, shuts itself down if the grid supply fails, and is the component that must appear on the compliant register. UKSOL's Plug-In Solar Pro kits contain a UKSOL solar module or modules, an ENA-compliant microinverter, the specified cables (a 4m AC cable and 2m DC cables) and a purpose-designed mounting solution¹⁵.

The register of compliant kits shows how the market has shaped up. The InstaGen plug-in solar kit includes two 435W bifacial all-black solar panels, an 800VA microinverter and a universal mounting frame that suits gardens, balconies and walls, with a manually adjustable tilt angle; InstaGen stated the kit would be available by the end of September at an RRP of £549¹. The PowerXpress kit includes 2x460W panels and an adjustable mounting bracket suitable for installation on walls, floors and balconies¹. The PatioSun kits are listed as comprising UKSOL solar panels and Hoymiles microinverters¹. On 16 September 2026 the type test register listed more than 50 compliant plug-in solar kits¹.

Note what is absent from every kit above: a battery. That is not an oversight by the makers but the shape of the rules, which permit plug-in generation and not plug-in storage.

Connecting to the grid: G98, G99 and type testing

Even a device that plugs into a socket is, in law, a connection to the electricity network, and the UK has an established framework for that. G98 is a UK engineering standard written by ENA, previously G83, and it exists as an obligation under the Electricity, Safety, Quality and Continuity Regulations 2002¹⁶. Micro generation under G98 is a simple connection procedure for fully type tested installations under 16A per phase, installed on a fit and notify basis¹⁷. Within G98, Form A covers installations of generation or storage at multiple premises and Form B a single premise¹⁷.

Larger installations go through G99. In all cases, any generating units, including electricity storage, connected through the G99 Fast Track process must use EREC G99 or G98 Type Tested Inverters¹⁸. The full detail of notifying a network operator is covered on our page about G98 and G99 grid connection.

For a plug-in kit, the practical effect is that the type testing does the work. Because the kit's microinverter is type tested and the whole kit appears on the ENA Connect Direct LCT Device Register, the householder connects on a fit and notify basis rather than applying for approval. Home Energy Scotland's advice is to make sure the specific model you are looking at is on the list of devices that meet UK standards¹¹. Only plug-in solar devices compliant with the Interim Product Specification will be able to be sold in the UK and plugged in under the amendment to the regulations¹⁹, so the register is the single check that a kit is lawful.

Fitting the system: why sockets cause problems

The government's intended position is that plug-in solar of less than 800W may be connected without requiring a professional electrician². But "no electrician needed for the kit" is not the same as "no electrician involved anywhere". UKSOL's own guidance is careful on this: a compliant plug-in kit is designed for customer installation in accordance with its instructions, but the socket itself must be suitable, correctly protected and professionally installed¹⁵.

That distinction carries the whole safety case. The kit is type tested and sealed; the socket and the wiring behind it are part of your home's fixed installation, and their condition is whatever the house's history left behind. An old socket on a dodgy extension lead, or a socket sharing a circuit with a high-load appliance, is where a plug-in system's risk actually sits. The same principle appears elsewhere in the regulations: EV chargers should be installed by a registered electrician with experience in this type of installation, and all EV charging installations must continue to comply with the requirements of BS 7671, the Wiring Regulations²⁰. The pattern in UK rules is consistent: anything that feeds electricity into a home's wiring is treated as part of that wiring.

For conventional storage, the position is unambiguous. Battery storage systems must generally be hard-wired into your home's circuit by a qualified electrician²¹. A battery can be installed in garages, on external walls or in utility rooms, depending on which one you choose⁴, but always as a fixed installation. Our page on the battery installation process covers what that involves.

For renters, the pre-checks are practical rather than electrical: permission from the landlord or freeholder for anything fixed to the building, an appropriate frame, fixing or anchors for a balcony¹³, and a socket in a location the cable can reach without creating a trip hazard.

The legal position explained

The legislation draws the line at storage, and it draws it precisely. A plug-in microgenerator is defined as one "not designed to import electrical energy from a low voltage consumer's installation for the purpose of storing energy for later supply, other than for control or auxiliary functions permitted by the Plug-in Solar Device Interim Product Specification"²². Read that twice and the whole position becomes clear: a device that pushes solar electricity out through a plug is a plug-in microgenerator; a device that pulls electricity in through a plug to store it is something else entirely, and something the rules do not allow.

The consumer bodies state the consequence plainly. Plug-in batteries are not included in the new regulations and remain illegal for use in the UK¹. Plug-in solar panels with integrated battery storage are not currently compliant with UK regulations²¹. And plug-in battery storage systems are not permitted to be connected to an electrical installation connected to the electricity network, known as grid-tied³. Electrical Safety First's advice is the quote at the top of this page: do not install them³.

The reason is not hostility to storage. The Energy Storage Alliance notes that plug-in battery products may be purchased, connected and relocated by consumers without direct professional involvement, unlike traditional battery systems installed by competent professionals, and that they have the potential to make energy storage more accessible, lower installation barriers and help consumers maximise the value of renewable electricity²⁴. The problem is the connection, not the concept. A battery that imports from and exports to a socket sits inside the home's fixed wiring without the protections that BS 7671 requires of a dedicated circuit, and without the notification regime that G98 and G99 impose on every other device that interacts with the network²⁰.

The lawful route to household storage remains a hard-wired battery installed by a qualified electrician²¹, which is covered across this site, starting with all-in-one battery systems and modular and stackable batteries.

Spotting faults and monitoring your setup

Plug-in kits are simple enough that most faults have simple causes, and the monitoring is built in. Compatible UKSOL kits include app-based monitoring through the specified microinverter platform¹⁵, so output can be checked from a phone without touching the equipment.

An unresponsive microinverter is usually the safety system working. The microinverter includes anti-islanding protection and shuts down automatically if the grid supply fails¹⁵. If the kit appears dead, first check whether the socket it feeds still has power, and whether the house has had a supply interruption. If the app shows the unit healthy but output is low, the causes are the ordinary ones: panel orientation and tilt, shading, and weather. A kit whose panels are on an adjustable frame¹ can be re-angled across the year, which is the one output improvement a householder can make safely.

On the battery side of the category, the honest answer to "why is my battery not charging" is that a lawful plug-in battery does not exist to have that fault. For a conventional home battery, the behaviour that looks like a fault often is not: with a battery and no solar panels, you stop charging the battery when it is full and discharge it when the next cheap tariff period ends, automatically⁴. Most battery storage systems monitor battery health and will alert you when a replacement is needed²⁵. Fault-finding on a hard-wired battery is covered on our pages about battery maintenance and faults and battery alarms.

What a householder must never do is open a microinverter or battery unit, rewire a kit's cables, or adapt the fitted plug. The kit's compliance depends on its type testing, and the specified cables are part of that compliance¹⁵.

How it affects your energy self reliance

A plug-in kit is a small, real step off full dependence on a supplier, and it is worth being precise about how small and how real. The independence it buys is a few hundred watts of daytime generation, un-stored, un-exportable in any planned way, and capped at 800W¹³. It will not run a house, and it will not carry anything through an evening or a power cut. What it does is shave a slice off a bill, at kit prices that start around £450 to £599¹, and give a renter or flat-dweller a stake in their own generation for the first time.

The storage that would multiply that independence has to be hard-wired, and the numbers explain why households bother. A parliamentary briefing puts the gain from adding battery storage to solar at an increase in annual savings from roughly £150 to £450 a year², and one estimate puts the saving for a three-bedroom home with a solar panel and battery system at around £582 every year²⁵. A home battery costs from £1,500 to £10,000, with a 5kWh battery system around £4,600⁴. The VAT position helps: the installation of electrical storage batteries in residential accommodation falls within the zero-rate provisions for energy saving materials²⁶.

The wider system context is that storage is what the grid itself is short of. The UK's total installed battery capacity is now around six gigawatts²⁷, with projections of 50 GW of battery storage by 2035²⁸, and storage is central to how the system operator balances the grid²⁹. Industry analysis suggests the UK requires 4.4 million homes to be equipped with smart solar PV and battery storage in order to cost-effectively manage demand³⁰. A plug-in panel is a household's smallest possible contribution to that; a hard-wired battery, charged from solar or from cheap off-peak electricity, is the version that actually shifts when a home draws from the network.

The dependence that remains, in every configuration on this page, is the grid connection itself. A plug-in kit needs a live grid supply to function, because its anti-islanding protection shuts it down the moment that supply fails¹⁵. A hard-wired battery without backup capability behaves the same way. Even the most independent home on this site keeps a wire to the network, and the rules on this page, G98, G99, BS 7671 and the Interim Product Specification, are the terms of that relationship.