Plug-in solar
£400 Plug-In Solar Kits: What You Get for the Money in the UK
The £400 plug-in solar panel is the headline price from the 2026 launch. In November 2026, £400 buys a compliant single-panel kit; what it includes and saves.
This guide is still being verified. Some details may change.
Key facts
- The £400 figure comes from reporting of the government's March 2026 announcement; the government's impact assessment expected many kits at £400 to £600.
- As of October 2026, compliant single-panel kits with an 800 W microinverter were listed from about £340, and two-panel kits from about £450.
- No Lidl plug-in solar kit was on sale in Great Britain when we checked lidl.co.uk on 3 November 2026.
- At £400 and savings of £70 to £110 a year, simple payback is roughly four to six years.
- The government assumed that 20 percent of buyers would need about £200 of electrical work, such as an outdoor socket.
The “£400 plug-in solar panel” is the price that headlined the UK launch: reported in March 2026 when the government promised kits in shops within months, and in line with its own estimate of £400 to £600 for a complete kit. As of November 2026, £400 buys a compliant kit with one 465 to 525 W panel, an 800 W microinverter, a moulded UK plug and a mount, saving about £70 to £110 a year. Lidl, the retailer most linked to the figure, was not selling one in Great Britain.
Where the £400 figure came from
Searchers typing “400 pound plug-in solar” are mostly following one news story. On 24 March 2026 the government announced it would make plug-in solar available within months, naming Lidl and Iceland as retailers working with it. National coverage that week ran headlines about Lidl selling £400 plug-in solar panels. The government release itself gave no price. Lidl GB’s corporate affairs director welcomed the regulatory change but, as far as we can find, Lidl has never published a UK price.
The closest official number is in the government’s final impact assessment of 16 July 2026. It says devices including cables, a microinverter and mounting equipment were expected to be available initially for around £400 to £600, with options outside that range, and modelled an average price of £500. So £400 was a fair description of the bottom of the expected market, not a promise.
What £400 buys in November 2026
Plug-in solar became legal in Great Britain on 27 August 2026. By October 2026, an independent price tracker listed 25 kits on sale that were verified on the ENA Type Test Register, from £336 to £989. We grouped them by price as a market snapshot; prices change weekly and we have not verified each listing.
| Price band (October 2026) | Typical contents | Panel capacity | Notes |
|---|---|---|---|
| About £340 to £360 | One panel, 800 W microinverter, lead, mount | 465 to 525 W | Cheapest compliant route; inverter has headroom for a second panel only if the kit allows it |
| About £445 to £470 | Two panels, 800 W microinverter, lead, mount | 930 to 1,030 W | The best fit for the 800 W limit on paper |
| About £550 to £600 | One or two panels, often with a premium mount or integrated design | 460 to 920 W | Lighter panels, ground stands or hybrid wall and ground mounts |
| £700 and above | Two to three larger panels, more elaborate mounting | 890 to 1,260 W | More output in dull weather; above 960 W of panels, manufacturers must advise a professional check of your installation |
The pattern is clear: at about £400 you choose between one panel with a little money to spare and two panels with very little. A two-panel kit at about £450 produces noticeably more than a single panel in mornings, evenings and winter, while both hit the same 800 W ceiling on a bright summer midday.
What a compliant £400 kit must include
Whatever the price, a kit sold legally in Great Britain must meet the Interim Product Specification. Before you pay, check the listing or box for:
- A moulded BS 1363 plug factory-fitted to the lead, with partially insulated pins and a fuse of no more than 5 A. No Schuko plug, no adaptor.
- An inverter rated at no more than 800 VA and 3.5 A.
- A mounting system for the surfaces it is sold for, with installation height and wind-load limits in the instructions.
- A label for your consumer unit and a statement that notifying your network operator is mandatory.
- ENA register status. The model must be listed as compliant, not just submitted.
- No battery. Kits with integrated storage are outside the current rules.
Retail purchases carry the standard 20 percent VAT. The zero rate on solar panels applies only when an installer supplies and fits them, which is not how plug-in kits are sold.
The costs around the kit
For most buyers, the kit is the whole cost. The government’s modelling assumed one hour of DIY installation, and then:
| Possible extra | Government assumption | When you might need it |
|---|---|---|
| Help with mounting or siting | £150, for 15 percent of buyers | Awkward railings, walls or heights |
| Minor electrical work | £200, for 20 percent of buyers | An outdoor weatherproof socket, a socket repair |
| Inverter replacement | £100 after 10 years | Conservative modelling assumption |
Two further checks can add cost. If your consumer unit has old rewireable fuses or lacks residual current protection, the specification tells you to have it checked and, where necessary, upgraded by an electrician first. And if your panels go on the outside of a block of flats, your freeholder may charge for a licence or ask for a survey; see plug-in solar in a flat.
Is £400 worth it? Payback by location
The government’s worked examples give about £110 a year for 800 W of panels tilted at 30 degrees facing south, and about £70 a year hung vertically facing east or west, for a household at home during the day. At the October to December 2026 price cap rate of 26.32p per kWh, those become about £113 and £72.
| Where the panels go | Saving per year | Payback on £400 |
|---|---|---|
| Garden stand or flat roof, 30° south | about £110 | about 3.6 years |
| South-facing balcony railing, vertical | about £80 to £95 (our estimate) | about 4 to 5 years |
| East or west railing, vertical | about £70 | about 5.7 years |
| North-facing or heavily shaded | well below £50 (our estimate) | more than 8 years |
The middle and bottom rows marked as estimates are our interpolations from the government figures, not modelled values. A single-panel kit of about 500 W will produce less than the 800 W of panels in the government examples, roughly in proportion to panel capacity on most days. Our savings guide shows how to work out your own figure.
One panel or two for about £400
The government’s savings figures assume 800 W of panels. Most kits near £400 have one panel of about 465 to 525 W, and the cheapest two-panel kits cost a little more. Output scales roughly with panel capacity until the 800 W inverter starts to cap the peak, which on a British balcony happens only on the brightest days. As a rough guide, built from the government’s model and scaled by panel capacity:
| Kit | Panel capacity | Tilted 30° south, per year | Vertical east or west, per year |
|---|---|---|---|
| One panel, about £340 to £360 | about 500 W | roughly 430 kWh; about £80 if 70% is used at home | roughly 235 kWh; about £50 if 80% is used at home |
| Two panels, about £445 to £470 | about 930 to 1,030 W | roughly 720 to 780 kWh; about £115 to £125 at 62% | roughly 420 to 470 kWh; about £80 to £90 at 72% |
These are our estimates, valued at 26.32p per kWh, not modelled or measured figures; the shares used at home for two panels are the government’s, those for one panel are our assumption. A single panel tends to have a higher share of its output used at home, because it rarely produces more than the home’s base load. On these numbers, paying about £100 more for a second panel buys roughly £35 to £40 a year of extra savings, and pays for itself in about three years if you have the space and the railing can take the weight.
£400 against rooftop solar
The government’s impact assessment puts the median installed cost of a small 4 kW rooftop system in Great Britain at £1,595 per kilowatt in 2025/26, around £6,400 in total, against about £500 to £750 per kilowatt for plug-in kits. Rooftop solar produces several times more and qualifies for export payments when MCS-certified, so it saves far more per year. Plug-in solar’s advantages are the low entry price, no installer, and that it moves with you. For renters, flat-dwellers and anyone without a usable roof, the £400 kit is often the only option.
Lidl, Aldi and the supermarket question
The £400 story was a supermarket story, so it is worth being precise about where things stand on 3 November 2026:
- Lidl GB was named by the government in March and June 2026 as a retailer working on plug-in solar. We found no plug-in solar kit on lidl.co.uk and no launch announcement. The retailers the government said on 26 August 2026 had committed to stocking kits were Amazon, Argos, Currys and Wickes.
- Aldi UK was not named in any of the government announcements we read, and its website showed no solar kits when we checked.
Our guides to Lidl plug-in solar panels and Lidl vs Aldi kits track what the discounters sell in Germany and what a UK kit would need.
How to buy a £400 kit sensibly
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Look at your spot first. Which way it faces and how much shade it gets decide whether £400 pays back in four years or ten.
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Decide one panel or two. One panel suits a small railing; two panels make better use of the 800 W inverter if you have the space and the mount allows it. Our 400 W vs 800 W guide compares them.
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Check the ENA register. Search the exact model and confirm it is listed as compliant.
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Check what is in the box. Plug, mount for your surface, cables, consumer unit label and instructions.
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Check permissions and your consumer unit. Landlord or freeholder consent, and modern residual current protection.
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Plug in and notify your DNO. Follow the instructions supplied with the kit; see telling your DNO.
Next steps
Frequently asked questions
What is the £400 plug-in solar panel?
It is the price widely reported in March 2026, when the government said plug-in solar would reach UK shops within months and named Lidl among the retailers working with it. The government's own analysis expected many complete kits at £400 to £600. It was never a single product or a confirmed Lidl price.
Can you buy a £400 plug-in solar kit in the UK?
Yes. In October 2026, compliant kits with one panel of about 465 to 525 W and an 800 W microinverter were listed from roughly £340 to £360, and the cheapest two-panel kits from about £445. Prices change often, so check the current listing and the ENA register status of the exact model.
Is Lidl selling £400 solar panels?
Not in Great Britain as of 3 November 2026. Lidl GB welcomed the new rules in March 2026, but we found no plug-in solar kit on its website and no announcement of a launch date or price.
Is a £400 plug-in solar kit worth it?
For 800 W of panels tilted towards the south with someone home in the day, the government's figures suggest about £110 a year, a payback under four years at £400. Hung vertically on an east or west-facing railing, it is closer to £70 a year and nearly six years. A single-panel kit saves proportionally less, and north-facing or heavily shaded spots rarely justify any kit.
What else might I need to pay for besides the kit?
Usually nothing. The government's impact assessment assumed 15 percent of buyers would pay about £150 for help with mounting and 20 percent about £200 for minor electrical work, such as an outdoor socket. A consumer unit without modern residual current protection may need upgrading by an electrician.
Why are some kits much cheaper than £400?
Many cheaper listings are microinverters or panels sold separately, kits with a European plug, or inverters sold for hard-wiring by an electrician. None of those is a compliant plug-in device. Check the model is listed as compliant on the ENA Type Test Register.
Sources
- Plug-in solar final stage impact assessment (16 July 2026)
- Government to make plug-in solar available within months (24 March 2026)
- Households can save as plug-in solar panels come to market (26 August 2026)
- Plug-in Solar Device Interim Product Specification, version 2.0, July 2026
- 800W plug-in solar kits UK: verified kits and prices (checked 8 October 2026)
- Lidl GB website, product search
- Changes to energy price cap between 1 October and 31 December 2026
- VAT on energy-saving materials and heating equipment (VAT Notice 708/6)
This guide is general information, not legal, tax or electrical advice. Your utility, state and local code have the final say.