After years of being stuck in a legal grey area, plug-in solar – the small, self-contained solar kits that hang off a balcony or lean against a garden wall – is on its way to the UK mainstream. On 24 March 2026, the government announced it would update the rules to allow these kits to be sold on the high street and plugged straight into a standard domestic socket, without an electrician.
If you live in a flat, rent your home, or simply don’t fancy the cost and disruption of a full rooftop system, this is probably the most interesting development in home energy for several years. But there’s also a fair bit of noise and confusion around it, so here’s a grounded look at what plug-in solar actually is, where the UK has got to on the rules, what a kit will realistically do for your electricity bill, and what you should check before buying one.
What is plug-in solar?
Plug-in solar – also called balcony solar, or by its German name Balkonkraftwerk (“balcony power plant”) – is a simplified version of a rooftop PV system. In the mature German market, a typical kit contains:
- Two solar panels, typically 400-500W each. Many modern kits use bifacial glass-glass panels, which generate from both sides and can deliver additional yield over standard panels – manufacturers quote up to 30% more in ideal conditions, with real-world gains typically in the 5-15% range when there’s a reflective surface behind the panel
- A microinverter which converts the panels’ DC output into 230V AC mains electricity. Under the proposed UK rules this will be capped at 800W AC output
- A cable ending in a standard mains plug, typically in 5m or 10m lengths
- Mounting hardware suited to where it’s going – balcony railing, flat roof, tile roof, garden shed, ground stand, or wall
- In most modern kits, a WiFi-connected app that shows real-time yield, daily and annual totals, and CO₂ savings
You may notice the panel wattages (say, 2 × 450W = 900Wp) exceed the 800W inverter limit. This is deliberate and is called overpanelling: because panels almost never produce their full rated output in real-world conditions, pairing more DC capacity with a slightly smaller inverter squeezes more useful energy out of the system without breaching the AC output cap.
You mount the panels outside in a sunny spot, plug the cable into a regular socket, and the system feeds electricity directly into the ring main that socket sits on. Whatever’s running in your house at the time – the fridge, router, TV, a phone charger – uses that electricity first, which means you draw less from the grid. When the sun goes down, the inverter simply shuts off and your home reverts to grid power automatically.
Once the UK rules are finalised, the promise is that there’ll be no rewiring, no scaffolding, no roofer, and no electrician needed. Installation time will depend on the mounting method but manufacturers’ typical figures are in the 1-2 hour range for someone with basic DIY skills.
Why the government is pushing it now
The announcement came as part of a broader energy security package prompted by the conflict in the Middle East and ongoing concerns about the UK’s exposure to volatile fossil fuel prices. Alongside plug-in solar, the government confirmed the new Future Homes Standard, which will require most new homes in England to be built with solar panels and low-carbon heating as standard, and trailed a trial scheme to offer discounted electricity on windy days in parts of Scotland and East England rather than paying wind farms to switch off.
Energy Secretary Ed Miliband said the government was determined to “give our country energy sovereignty” by rolling out clean power however it can – including by making plug-in solar available in shops. Retailers including Lidl and Amazon, along with manufacturers such as EcoFlow, are working with the government to bring products to the UK market.
For context: plug-in solar is already well-established in Germany, where gov.uk cites around 426,000 new balcony systems registered in 2025 alone. The UK is broadly adopting a version of the German model, with the same 800W output limit.
Where the UK rules have got to (and where they haven’t)
This is the bit that’s easy to get wrong, because the announcement has been reported in places as if plug-in solar is now legal overnight. It isn’t. The government’s announcement was a statement of intent to update two separate bits of rulemaking, and the detail is still being worked through:
1. BS 7671 (the wiring regulations). A new version – Amendment 4 (2026) – was published by the IET and BSI on 15 April 2026. It’s widely reported in the solar industry to include provisions enabling sub-800W plug-in connections, though this isn’t among the headline changes flagged in the IET’s own announcement (which centre on stationary secondary batteries, medical locations, ICT earthing and Power over Ethernet).
2. The G98 distribution code – the rules governing how small generators connect to the grid – is also being updated. The government has said this will allow <800W plug-in solar to connect to a domestic socket without an electrician, with “tailored safety standards.” The updated code has not yet been published.
3. A BSI product standard will need to define what a compliant UK plug-in solar kit actually looks like. This hasn’t been published, but is expected around summer 2026 according to industry commentators.
So the honest picture today: the government has announced the direction of travel, and the relevant rulemaking bodies are working on it. No UK-certified plug-in solar kits are yet on sale. Imported kits from mainland Europe don’t automatically meet UK requirements – a European CE mark or German VDE certification doesn’t transfer post-Brexit – and until the BSI product standard lands, there’s no definitive “approved for UK use” kitemark to look for.
If you’re not in a rush, waiting until properly UK-certified products appear in the shops is the sensible move: insurers, DNOs and (if you ever sell the house) surveyors will all want to see the paperwork.
You can also, right now, install a compact solar system on a balcony, fence or garden wall if you have it wired in via a fused spur on a dedicated circuit by a qualified electrician. That’s a more involved route and loses the “plug and play” appeal, but it’s been legal all along.
How much will a kit cost, and what will it save you?
No UK-certified kits are yet on sale, so UK prices aren’t firmly established. Based on current German market prices and industry previews of expected UK retail pricing, early figures are likely to be:
- Basic 800W kit (two panels + microinverter + mounts): around £450-£550
- Kit with a small battery for evening use: around £900-£1,200
UK prices will depend on certification costs, shipping, VAT and retailer margins, and may end up higher than German equivalents since the UK market is only just opening up.
For rough comparison, a full rooftop PV system with a home battery typically costs around £10,000-£14,000 for a typical household, so plug-in solar is clearly in a different affordability bracket whatever the final UK price turns out to be.
Savings depend heavily on where you live, which way your panels face, and – crucially – how much electricity you use during daylight hours. An 800W system won’t produce 800W all day; real-world output varies with time of day, season, weather, panel orientation and shading. Because plug-in solar typically can’t export to the grid for payment, the savings only materialise when you actually use the electricity as it’s being produced.
The government hasn’t published an estimated annual saving figure. EcoFlow, one of the manufacturers working with the government on UK rollout, has said its two-panel system “can help you save up to £115 per year on energy costs.” Other industry commentators have put figures anywhere from £70 to £180 per year depending on assumptions. The honest answer is that your own savings will depend almost entirely on:
- How much of what you generate you can actually consume in real time (the “self-consumption ratio”)
- How many hours of useful sunlight your mounting location gets
- What you’re paying per kWh for grid electricity
A household where someone is home during the day, or where the dishwasher and washing machine can run on timers during peak sun, will do substantially better than a household where everyone leaves at 8 and gets back at 6.
The battery option
For households that are empty during the day, a kit with a bundled battery shifts the economics meaningfully. The panels charge the battery while no one’s home, and the system discharges into your home circuit in the evening when you’re actually using electricity. This substantially increases the proportion of your solar generation that you actually end up using, at the cost of a significantly higher up-front price and a longer payback period on the additional battery spend.
Battery-equipped kits also give you a degree of evening shift: you’re running the router, the lights and the TV off stored solar rather than imported grid electricity during peak-rate hours, which matters more if you’re on a time-of-use tariff.
Mounting: more of a decision than it looks
Where you’re actually going to put the panels is the single biggest practical choice, and kits are increasingly sold with the same electrical hardware paired to different mounting options. The main categories:
- Balcony railing clamps – adjustable 0-30° brackets that grip standard metal railings. The classic “Balkonkraftwerk” setup. Won’t work with glass or concrete balconies without specialist fixings.
- Flat roof / garden ground stands – ballasted or fixed-angle frames that sit on a flat surface. Good for sheds, garages, flat extensions, or a sunny patch of garden.
- Tile roof brackets – for mounting on a pitched outbuilding roof. Available in single-module or paired-module versions.
- Wall mounts – fixed-angle brackets for a sunny south-facing wall, useful where no railing or flat surface is available.
- Garden shed mounts – typically 0-30° adjustable, sized for typical shed roof pitches.
Check the weight: bifacial glass-glass panels are typically around 20-25kg each per manufacturer spec sheets, so fence panels and flimsy shed roofs may not be suitable without reinforcement. Concrete balconies, glass balustrades, and listed buildings all complicate mounting and may need a professional to assess the fixings.
What plug-in solar won’t do
A few reality checks worth being clear on:
- It won’t run your kettle. 800W covers your base load – fridge, router, standby devices, lighting, a laptop or two. A 2kW kettle or a 3kW electric shower will still be mostly supplied from the grid.
- It won’t keep the lights on in a power cut. Microinverters have a mandatory anti-islanding feature: when the grid goes down, they shut off automatically. This is a safety requirement, not a flaw.
- It won’t replace a rooftop system. If you own your home and have a suitable roof, a full rooftop PV install with a battery will generate several times more electricity and qualify for the Smart Export Guarantee. Plug-in solar is the option for people who can’t, or don’t want to, do that.
- It won’t pay you for exported electricity – at least not initially. Current plug-in kits are designed around self-consumption; any surplus goes to the grid unpaid. This may evolve as the market develops.
What to check before buying
When UK-certified kits arrive, these are the things likely to matter:
- UK product certification. A BSI product standard for plug-in solar is expected but not yet published. When it is, this will be the one non-negotiable: look for explicit UK certification rather than imported EU or German VDE marks.
- 800W AC output cap on the microinverter. This is the limit the government has indicated. Kits marketed with higher AC outputs are for other markets.
- Microinverter brand. Hoymiles, Enphase, Growatt, Deye, TSUN and Envertech are all well-established names in the European market. Check whichever model is in the kit has the correct UK G98 compliance and automatic grid-loss shutdown (anti-islanding).
- Number of MPPT inputs. If both panels face the same direction, a single-input inverter is fine. If they face different directions (say, one on an east wall, one on a south wall), you need a dual-input model so each panel operates independently. If you might expand later, a four-input inverter is a sensible future-proofing choice.
- Panel type. Bifacial glass-glass panels cost a bit more but generate somewhat more, especially over a light-coloured surface. Worth the upgrade if the siting suits.
- Mounting hardware suited to where you’re putting it. Railing clamps, wall brackets, ground stands, tile-roof mounts and flat-roof ballast kits are all different. Confirm the mount matches your situation before ordering.
- Cable length. Kits typically ship with a 5m or 10m socket cable. Measure the run from your chosen mounting spot to the nearest outdoor-rated socket before buying – running an indoor extension lead out through a window is not appropriate.
- App and monitoring. Most mainstream kits now include a WiFi-connected app showing real-time generation, daily and annual yield, and CO₂ savings. Worth having – it’s the quickest way to spot a fault or realise a panel has slipped out of alignment.
- Weather rating. Look for an IP-rated microinverter and MC4 connectors rated for outdoor use.
DNO notification – check before you install
One detail the government announcement didn’t pin down is whether plug-in solar will require you to notify your Distribution Network Operator (DNO) – the company that runs the cables in your street.
Under the existing G98 distribution code, any generation equipment up to 3.68kW on a single-phase supply follows a “fit and notify within 28 days” process: you (or your installer) fill in a free online form after installation telling the DNO what’s been connected. Plug-in solar at 800W sits comfortably within that threshold.
The government has said G98 will be updated alongside the wiring regulations to accommodate plug-in solar, and it’s not yet clear whether the new rules will keep a simplified notification requirement, remove it entirely for sub-800W kits, or introduce a different registration route (as some commentators have suggested). Until the updated code is published, the sensible assumption is that some form of notification will be expected – most likely the existing 28-day fit-and-notify process.
For reference, Germany – which the UK is broadly modelling its approach on – has had balcony solar long enough to simplify its process considerably. German owners register their system online with the Federal Network Agency’s Marktstammdatenregister (MaStR) portal, which takes about five minutes and around five fields of information. Since the Solarpaket I reforms in May 2024, a separate notification to the grid operator is no longer needed – the MaStR portal forwards the data automatically. Whether the UK ends up with something that streamlined remains to be seen, but it’s the direction of travel the government has indicated.
When you buy a certified UK kit, the retailer or manufacturer should make the current requirement clear in the instructions. If in doubt, a quick check of your DNO’s website will tell you what they expect – your DNO depends on your postcode (UKPN for London and the South East, NGED for the West Midlands, Northern Powergrid for the North East, SSEN for Scotland, and so on).
Renting? You probably still can
One of the genuine selling points of plug-in solar is that it’s portable. Nothing is drilled into the building, the panels clamp on and off in minutes, and when you move house it comes with you. Strictly speaking a panel clamped to a balcony railing could be considered an alteration, so it’s worth checking – but most landlords won’t object to something that’s reversible, tidy and ultimately lowers a tenant’s bills.
So – should you buy one?
Plug-in solar isn’t a silver bullet. It won’t get anyone off the grid, it won’t power a heat pump, and the economics are marginal if no one’s home during the day. But for the right household – daytime occupants, a sunny outdoor space, and electricity usage that’s at least partly shiftable to daylight hours – a modest kit that can be installed without scaffolding or an electrician and that trims something off your daytime electricity bill is clearly an attractive proposition.
The sensible plan for most people is: wait until UK-certified kits are actually on the shelves (industry expectation is summer 2026 onwards), buy from a reputable retailer, follow the installation and notification instructions that come with the product, and see how it goes. It’s the simplest, cheapest, most disruption-free way to generate your own electricity that the UK is likely to see – and while the regulatory details are still being finalised, the direction is clear.