Plug-in solar panels are small solar kits, usually one or two panels with a built-in micro-inverter, that you plug into an ordinary 13A socket to cut the electricity you buy from the grid. They became legal to buy and use in Great Britain on 27 August 2026, capped at 800W of output, and a typical kit saves around £70 to £110 a year. They are a genuinely useful option for renters, flats and balconies, but they are not a substitute for a full rooftop system if you own your home and want a big cut in your bills.
This guide explains how plug-in solar works, the exact rules as of September 2026, what you can realistically generate and save (with a worked example), costs, the battery question, and how plug-in compares with a professionally installed MCS rooftop system. We are an MCS-certified installer, so we will be straight about where plug-in makes sense and where it does not.
What are plug-in solar panels?
Plug-in solar, often called balcony solar in Europe, is a complete self-install kit. A typical UK kit contains:
- One to four solar panels (most UK bundles use one or two full-size panels of around 400W to 520W each)
- A micro-inverter that converts the panels’ DC electricity into 230V AC household electricity
- A mounting system for a balcony railing, wall, flat roof or the ground
- A factory-fitted lead with a standard UK three-pin plug
- Usually an app or monitoring so you can see what the panels are producing
You mount the panels, plug the lead into a suitable socket and the kit starts supplying your home. There is no scaffolding, no electrician required in most homes and nothing fixed permanently to the building, which is why plug-in solar has been popular for years in Germany and is now arriving in UK shops.
How do plug-in solar panels work?
They work in the same way as rooftop solar, just on a much smaller scale. If you want the underlying physics, our plain-English guide to how solar panels work covers it. In short:
- The panels generate DC electricity from daylight, more in bright sun, less on cloudy days and in winter.
- The micro-inverter converts it to AC and limits the output to a maximum of 800VA, the legal cap for plug-in kits.
- Electricity flows back through the socket into your home’s wiring, where it is used by whatever is running at the time: fridge, freezer, router, TV, laptops, a washing machine.
- Your home uses the solar power first. You only buy from the grid whatever the panels cannot cover at that moment.
- Anything you do not use flows out to the grid. Under most tariffs you are not paid for this, which is why timing your usage matters.
For safety, the inverter must switch off automatically if it is unplugged or if there is a power cut (known as anti-islanding). That means the pins of the plug are never live when unplugged, and it also means plug-in solar will not keep your lights on during an outage.
Are plug-in solar panels legal in the UK? The rules as of September 2026
Yes, in Great Britain. As of September 2026, the position is:
- Legal from 27 August 2026. The change was made by SI 2026/848, which amended the Plugs and Sockets etc. (Safety) Regulations 1994 and the Electricity Safety, Quality and Continuity Regulations 2002 so that a generator can connect through a standard BS 1363 plug. The government confirmed the change in its announcement of 26 August 2026.
- Kits must meet the government’s product specification. The Department for Energy Security and Net Zero’s Plug-in Solar Device Interim Product Specification (version 2.0, July 2026) sets the technical and safety rules. It references the IET Wiring Regulations, BS 7671:2018+A4:2026, and BS 1363 plugs. A permanent British Standard for plug-in solar is still being developed.
- 800VA maximum output. The inverter can supply no more than 800VA (and 3.5A) into your home. The panels themselves can add up to 2,000W, across a maximum of four panels, so a kit might have 920W of panels behind an 800W inverter to squeeze more out of dull days.
- Compliant, registered inverters only. The inverter must be type tested to the network connection standard G98 and listed on the Energy Networks Association (ENA) type test register.
- A moulded plug with a fuse of 5A or less, fitted by the manufacturer. It cannot be rewired.
- One plug-in kit per household under the current G98 connection rules. The product specification would allow one per circuit, but G98 limits it to one per home unless and until that changes.
- You must notify your network operator. G98 is a connect-and-notify process: you plug in, then register the kit with your local distribution network operator (DNO) within 28 days. It is free and the DNO cannot refuse it. Your kit’s instructions and retailer will point you to the online notification route.
- Northern Ireland is not yet covered. G98 applies to Great Britain only, and applying the specification to Northern Ireland is still under consideration.
Do you need planning permission for plug-in solar?
In England, a new permitted development order (SI 2026/896) also came in on 27 August 2026. In most cases you will not need planning permission, but there are limits. Wall or balcony-mounted equipment should not project more than 0.4m, or 0.2m where the wall faces a road. Plug-in kits cannot use these rights on a wooden wall, wooden balcony or timber-clad exterior. There are also tighter rules for listed buildings and conservation areas, and ground-mounted kits are limited to 9 square metres. In Scotland and Wales, check your local planning rules before fixing anything to a wall.
Renters, leaseholders and flats
Planning rules are separate from permission from the owner of your building. The government’s guidance says renters, leaseholders and residents in managed blocks should get consent from their landlord or freeholder before fitting a kit. Kits must also not be installed on buildings undergoing external wall or cladding remediation work.
Is plug-in solar safe?
The government commissioned independent testing which concluded that compliant kits are safe on UK ring circuits within defined limits. The safety comes from following those limits. As installers, these are the points we would underline:
- Never use an extension lead, multi-way adaptor, RCD adaptor or travel adaptor. The specification bans them. Extension leads are designed to carry power out of a socket, not back into it, and can overheat.
- Use a socket circuit only. Not a lighting circuit, and not a fused spur feeding fixed equipment such as a cooker or boiler.
- Check your consumer unit. The specification advises modern RCBO protection. If you still have old rewireable fuses, or you cannot tell which sockets are on which circuit, get an electrician to check first.
- Over 960W of panels? Get a professional assessment. Manufacturers must advise that kits with more than 960W of panels should have the electrical installation checked before use.
- Use a weatherproof socket. An outdoor socket is the usual choice and must be installed by a qualified electrician. The Energy Saving Trust checklist notes an indoor socket can be used, but do not trail cables through windows or doors.
- Mount it securely. A full-size panel is roughly 1.8m by 1.1m and around 22kg, and it acts like a sail in the wind. Follow the manufacturer’s mounting instructions exactly.
- Buy a complete compliant kit. Do not piece together a panel and inverter from different sellers, and be wary of cheap imports that are not on the ENA register.
How much electricity do plug-in solar panels generate?
Output depends on panel size, direction, tilt, shading and where you live. A realistic guide for a UK kit:
- Single panel (around 460W): roughly 300 to 400kWh a year in a sunny, unshaded spot
- Full 800W kit: the government and Energy Saving Trust put this at around 400 to 700kWh a year, with 700kWh at the top end in good conditions
For comparison, Ofgem’s typical household uses around 2,700kWh of electricity a year, so an 800W kit might cover up to around a fifth to a quarter of it in the best case. A vertical balcony panel facing east or west, or shaded by the block opposite, will produce noticeably less. South-facing and tilted at around 30 to 40 degrees is ideal.
Will a 400W solar panel run a fridge?
During the day, often yes. A typical fridge-freezer draws perhaps 50 to 150W when its compressor runs, well within what a 400W panel produces in decent sun. But it will not run it at night or on a very dull winter day, and the grid simply tops up whatever the panel cannot supply. The government says a full 800W kit in sunshine can cover a fridge, TV, router, laptop and phone charger at the same time.
How much can plug-in solar save? A worked example
The key number is not how much you generate but how much of it you use yourself. Anything exported is, for most people, given away.
Assumptions: an 800W kit with two 460W panels, generating 650kWh a year. Electricity at 26.32p per kWh, which is Ofgem’s average price cap unit rate for direct debit customers from 1 October to 31 December 2026 (VAT on electricity has been removed for this period). Your own rate may differ.
| Household | Share of solar used at home | kWh used | Annual saving | Payback on a £650 kit |
|---|---|---|---|---|
| Out at work all day, little running in the daytime | 40% | 260kWh | around £68 | around 9.5 years |
| Mixed: some home working, timers on appliances | 50% | 325kWh | around £86 | around 7.6 years |
| At home most days, runs dishwasher and washing in daylight | 60% | 390kWh | around £103 | around 6.3 years |
That lines up with the government’s own estimate of around £70 to £110 a year, and with Octopus Energy’s range of £50 to £150. A single-panel kit costs less but saves less: at 350kWh a year with 75% used at home, you would save around £69 a year, so a £450 kit pays back in around six and a half years.
Three things improve the numbers: using more electricity while the sun is out (timers on the dishwasher and washing machine), avoiding shade, and a sunnier location. Along the south coast, including Sussex, generation tends to be at the higher end of the ranges above.
Can you get paid for exported electricity?
Generally, no. The Smart Export Guarantee requires installations to be certified under MCS or an equivalent scheme (see Ofgem’s SEG guidance), and self-installed plug-in kits do not have an MCS certificate. As of September 2026, the exception we are aware of is Octopus Energy, which offers its Outgoing Prime export tariff to customers who buy their plug-in kit from Octopus and have a working smart meter. British Gas has said it is working on export payments for plug-in solar. Check the current terms before relying on export income, and read our Smart Export Guarantee guide for how SEG works on rooftop systems.
How much do plug-in solar panels cost?
The government named Amazon, Argos, Currys, Wickes, Screwfix and B&Q among the retailers stocking compliant kits. Prices we saw in September 2026 include:
| Kit type | Typical price, September 2026 | Notes |
|---|---|---|
| Single panel, around 400W to 520W | £350 to £700 | Octopus Energy sells a 460W single-panel bundle for £450 |
| Two panels, 800W inverter | £550 to £1,000 | Octopus Energy’s two-panel bundle is £650, including VAT and kerbside delivery |
| Outdoor socket fitted by an electrician, if needed | around £140 to £260 | Only if you do not already have a suitable weatherproof socket |
| Electrical check (EICR), if your wiring is old or unknown | around £100 to £250 | Recommended for older consumer units or kits over 960W |
Lidl plug-in solar and Octopus plug-in solar
Lidl: Lidl sells balcony solar kits in Germany and has been widely reported as planning UK kits at around £400. As of September 2026, Lidl GB has only said it is exploring the possibility, with no confirmed UK product, price or launch date. If a Lidl kit does appear, check it is listed as compliant on the ENA register before buying.
Octopus Energy: Octopus sells one-panel (£450) and two-panel (£650) bundles with 460W panels, a wall or ground mount, a micro-inverter, a 5m cable with a three-pin plug and app monitoring. Octopus says its kits need a weatherproof, exterior-rated 13A socket, and that buyers can access its Outgoing Prime export tariff.
Plug-in solar panels with a battery
Not yet. Plug-in batteries and all-in-one solar-plus-battery kits are outside the UK plug-in solar rules as of September 2026. The product specification requires kits to carry a warning that they must not be used with a battery storage system, and the government has said battery products remain out of scope while it considers the evidence. Octopus has said it is aiming for early 2027 for a battery option, but that depends on the rules changing.
That matters because a battery is what lets solar power your evenings. If you want solar plus storage today, it needs to be a professionally installed system. Our UK solar battery guide and battery storage cost guide explain the options.
Pros and cons of plug-in solar panels
Advantages
- Low upfront cost, from around £350 to £1,000
- No scaffolding, no roof work and usually no electrician
- Suitable for renters and flats, and you can take it with you when you move
- Payback of roughly six to ten years on the numbers above
- No planning permission needed in most cases in England
Disadvantages
- Capped at 800W, so savings are modest, typically £70 to £110 a year
- No battery allowed under current rules, so nothing for the evening peak
- Usually no export payment, so unused power is given away
- Does not work in a power cut
- Only one kit per household, and full-size panels are big and heavy for a balcony
- Not allowed on timber balconies or walls under the English planning rules, and landlord or freeholder consent may be needed
- No MCS certificate, so it does not add the same value to a property as a certified system
Who are plug-in solar panels for?
Plug-in solar makes the most sense if:
- You rent and cannot fit rooftop panels, and your landlord agrees
- You live in a flat with a south-facing, non-timber balcony or a garden
- Your roof is unsuitable: heavily shaded, north-facing, listed or too small
- Someone is home in the daytime, so more of the power gets used
- You want to try solar on a small budget before committing to more
It makes less sense if you own a house with a reasonable roof. There, an 800W cap leaves most of your potential savings on the table.
Plug-in solar vs rooftop solar: which is better?
A rooftop system is a different scale of investment and return. The figures below use typical 2026 ranges. Rooftop costs and output are from our own solar panel cost guide, and actual results depend on your roof and usage.
| Feature | Plug-in solar kit | Rooftop MCS system, around 4kW |
|---|---|---|
| Typical cost | £350 to £1,000 | £6,500 to £8,000, with 0% VAT |
| Maximum output | 800VA, legal cap | Around 4kW, sized to your roof |
| Yearly generation | around 300 to 700kWh | around 3,400 to 4,400kWh |
| Typical yearly saving | around £70 to £110 | around £450 to £800, including export |
| Typical payback | around 6 to 10 years | around 6 to 9 years |
| Export payments (SEG) | No, except a supplier-specific offer | Yes, with an MCS certificate and smart meter |
| Battery | Not permitted as of September 2026 | Yes, can be added now or later |
| Installation | DIY, then notify DNO within 28 days | MCS-certified installer handles design, DNO paperwork and certification |
| Warranties | Manufacturer only, often 10 years or more | Panel warranties typically 25 years or more, plus installer workmanship guarantee |
| Best for | Renters, flats, balconies, unsuitable roofs | Homeowners wanting a major bill reduction |
The payback periods can look similar, but the difference is the size of the saving. Over 20 years, a plug-in kit might save around £1,400 to £2,200 at today’s prices, while a rooftop system could save around £9,000 to £16,000. If you want to weigh up the bigger option in detail, see are solar panels worth it in 2026.
Frequently asked questions
Is plug-in solar now legal in the UK?
Yes, in Great Britain. Plug-in solar became legal to buy and use on 27 August 2026. Kits must meet the government’s product specification, be capped at 800VA output, and be registered with your network operator within 28 days. Northern Ireland is not yet covered.
Can you just plug a solar panel into a socket?
Only if it is a complete, compliant plug-in solar kit with an inverter listed on the ENA register and a factory-fitted plug. It must go directly into a socket on a socket circuit, with no extension lead or adaptor, and only one kit is allowed per household.
Do I need to tell anyone I have installed plug-in solar?
Yes. You must notify your local distribution network operator within 28 days of connecting it, under the G98 connect-and-notify process. It is free and cannot be refused. Renters and leaseholders should also get landlord or freeholder consent before installing.
How much do plug-in solar panels save a year?
Typically around £70 to £110 a year for an 800W kit, depending on how much of the power you use at home. Using a unit rate of 26.32p per kWh and 650kWh of generation, a household using 40% to 60% of it saves roughly £68 to £103 a year.
Can I add a battery to plug-in solar panels?
Not under the current rules. As of September 2026, plug-in batteries and solar-plus-battery kits are outside the plug-in solar framework, and kits must carry a warning not to use them with battery storage. For solar with a battery, you need a professionally installed system.
Can plug-in solar panels earn the Smart Export Guarantee?
No. SEG requires an MCS-certified or equivalent installation, which self-installed plug-in kits do not have. As of September 2026, Octopus Energy offers an export tariff to customers who bought their plug-in kit from Octopus, but this is a supplier offer, not SEG.
Do plug-in solar panels work in a power cut?
No. For safety, the inverter switches off automatically when the grid goes down or the plug is removed. This stops electricity feeding into the network while engineers may be working on it.
What are the disadvantages of plug-in solar panels?
The main drawbacks are the 800W cap, modest savings of around £70 to £110 a year, no battery option under current rules, usually no payment for exported power, only one kit per home, and restrictions on timber balconies and in some listed or conservation properties.
Are plug-in solar panels worth it?
For renters, flats and homes with unsuitable roofs, often yes: a kit costing around £450 to £650 can pay back in roughly six to ten years. For homeowners with a suitable roof, a rooftop MCS system typically delivers several times the annual saving and can include a battery and export payments.
Own your home? Compare plug-in with a rooftop system
Plug-in solar is a welcome change, and for many renters and flat owners it is the easiest way to start using solar. But if you own your home and want real bill reduction, an 800W kit only scratches the surface. A properly designed rooftop solar system can generate around five to six times as much electricity, earn Smart Export Guarantee payments and work with battery storage.
Greener Solar Solutions is an MCS-certified, NICEIC-approved installer with directly employed electricians, working across Sussex and Surrey. If you would like to see how a rooftop system compares for your home, book a free, no-obligation survey and we will give you honest figures, including telling you if plug-in solar would suit you better.
