Plug-in Solar Kits UK: Cost & Buying Checklist (2026)

You can buy plug-in solar hardware in the UK today, and on 27 August 2026 it becomes legal to run one from an ordinary wall socket. Those two facts do not join up yet. The socket rules only cover a certified “plug-in microgenerator”, no product has been certified, and the kits actually on UK shelves right now include a battery, which the rules leave out entirely. So the honest answer to “what should I buy” on 24 July 2026 is: nothing you can order today will be legal to plug in on 28 August.

That is not a reason to give up on the idea. It is a reason to know exactly what you are waiting for, which is what the rest of this guide is: the specification a compliant kit has to meet, what the hardware costs, what it realistically saves, and the one route that is legal today.

If you have searched “balcony solar kit UK”, you are looking at the same hardware covered here. Balcony solar is the European name for plug-in solar: one or two panels, a microinverter, and a plug. A balcony rail is one mounting option; in the UK most people use a garden wall, shed, garage, or flat roof instead.

Can You Buy a Legal Plug-in Solar Kit in the UK Today?

No. You can buy hardware, but you cannot buy a kit that will be legal to plug into a socket when the law changes on 27 August 2026, because no product has been certified against the specification that law points at.

The rulebook itself is settled. The Interim Product Specification reached version 2 on 16 July 2026, the same day SI 2026/848 was made, and every numeric limit in it stayed the same as the draft. What has not happened is the step after that. A manufacturer now has to obtain written confirmation that its device has been assessed and identified as compliant before it can sell it for socket use. Version 2 explicitly closed the shortcut here: appearing on the ENA Type Test Register is no longer enough on its own to demonstrate compliance. As of 24 July 2026 nobody has completed that step publicly.

This is the distinction most coverage of 27 August misses. It is a legal start date, not a launch date. For the full regulatory picture, including how the law got here and what is still pending, see the plug-in solar UK guide.

That leaves you two lawful positions today. You can wait for a certified kit and plug it in yourself once one exists. Or you can go hardwired now: have a registered electrician fit panels and a microinverter to their own breaker and notify your DNO under G98, exactly like a small roof array. The hardwired route needs no new product standard, because it already has one.

What Is Actually on Sale Right Now, and Why It Does Not Qualify

Search for a plug-in kit in the UK and the products you land on are battery kits. On uk.ecoflow.com, checked on 24 July 2026, the STREAM range runs at £799 for the Pro, £899 for the Ultra (800W with a 1.92kWh battery) and £1,249 for the Ultra X (800W with 3.84kWh). They are well-built and they do what they say. They are also outside the scope of the specification, which covers PV-only devices: panels and a microinverter, no storage.

Be precise about what that means, because it is easy to overstate. A battery kit is perfectly legal to buy and to own. You can run it off-grid, charging the battery from the panels and powering things directly from the unit, today and after August. What the new law does not do is give a battery kit a route to a standard wall socket. That permission was written for a narrower class of device, and a battery puts a product outside it.

Nothing on those product pages told me otherwise when I looked. There was no note on the UK legal status of socket connection and no mention that storage falls outside the interim specification. That is worth knowing before you spend £799, not after, because the feature that makes a battery kit attractive is the same feature that keeps it outside the socket rules.

If you want the battery anyway, and plenty of people reasonably do, then buy it for what it is: an off-grid or hardwired system, priced accordingly, with an electrician involved if it is going to feed the house. Do not buy it expecting 27 August to turn it into a plug-and-play product.

What If You Already Have Solar Panels?

G98 notification covers up to 3.68kW per phase, and that limit is cumulative across your whole property, not per inverter. If you already have a 3kW roof array and add an 800W plug-in kit, your property moves to 3.8kW and drops out of G98 into G99: a formal DNO application you need approval for before connecting, typically weeks rather than days.

DNOs assess your maximum physical capacity, not a software export limit you could dial down later. On a three-phase supply the 3.68kW allowance applies per phase, so which phase you connect to can matter. A plug-in kit is not automatically “just plug in” for a home that already has solar, even once the product rules are final.

What Will a UK-Compliant Kit Need?

This is the part you can act on now. When kits do appear, some listings will be genuinely compliant and some will be German-market hardware relabelled for a UK audience, and the difference will not be obvious from the product photo. The specification gives you a checklist you can hold a listing against. Every line below is from version 2 of the interim specification, published 16 July 2026.

Two numbers do most of the work, and they are really one number. 800 VA is the ceiling on inverter output, which is why every kit on sale anywhere in Europe tops out there. UK mains runs at roughly 230V, and 800 divided by 230 is about 3.5, so the current cap falls straight out of the power cap rather than adding a second restriction.

One rule sits outside the product spec and catches people out. You are still limited to one plug-in device per household. Version 2 of the specification is written for one device per final ring circuit, which would let a larger house run more than one, but it carries a note saying the grid connection rules restrict it to one per household unless and until they are amended. That amendment has not been made. Until it is, one device is the live limit, and it is likely still the limit on 27 August.

How Much Will an 800W Kit Cost?

Roughly £210 to £500 for an 800W kit without a battery, and roughly £590 to £1,260 once a battery is included. The government’s own working assumption, from the interim specification’s economic assessment, sits inside that first range at £400 to £600, because it is modelling a branded packaged kit rather than the cheapest self-sourced parts. All of these are hardware figures. None includes mounting labour or an electrician.

Those payback ranges are wide on purpose, and you should read the ends of them carefully. The fast end of each row assumes you buy at the bottom of the cost range and hit the top of the self-consumption range at the same time, which rarely happens together. Take the middle of each row and you land at roughly 6 to 9 years in every case. That is the number to plan around.

Note what the government’s own table quietly admits: up to a quarter of households are expected to want practical help with mounting, and up to one in five some electrical work. The hardware price is the kit. The install around it is not always free.

One cost you should not budget a saving against is VAT. The 0% rate applies to installed, supply-and-fit systems, not to a kit you order online and put up yourself. Nobody is knocking 20% off a self-bought plug-in kit, so ignore any listing that implies otherwise.

How Much Could Plug-in Solar Save?

Our default, conservative estimate: £40 to £85 a year without a battery. An 800W kit makes roughly 650 to 800 kWh a year in the UK. Without storage you only benefit from generation while you are home and using electricity, so realistic self-consumption for a household that is out during the day is 25 to 40%. At 26.11p/kWh, which is the Ofgem price cap for 1 July to 30 September 2026 and nothing beyond it, that is £40 to £85.

Worked through: 650 kWh x 25% x 26.11p is about £42. 800 kWh x 40% x 26.11p is about £84. That is the whole calculation. There is no hidden multiplier and no export value in it.

The rate matters more than people expect, and it has a shelf life. Ofgem publishes the October to December cap by 26 August 2026. Any figure you see quoted for that quarter today is a prediction, not a rate, and every saving on this page moves with it.

With a battery, estimate £90 to £145 a year. A 1.92kWh battery holds enough to carry a typical evening, which lifts self-consumption from a quarter to somewhere around 55 to 70%. I have labelled that as an estimate deliberately: it depends on your battery size and on how much your household actually draws after dark, and it is the assumption most likely to be wrong for you specifically. Halve it and check the payback still works before you spend £899.

Payback. Realistically 5 to 10-plus years, before any installation cost. That is longer than most people expect, and it is longer than the two to four years you will see quoted on kit listings.

The government’s own illustration, separately labelled. DESNZ’s assessment quotes about £110 a year for a south-facing kit at 30 degrees, and about £70 a year for a vertical east-west mount. Both figures assume someone is home all day, no battery, no export income, average irradiance, little shading, and the July to September 2026 cap. Loosen any one of those and the real number moves toward our £40 to £85 default.

The two scenarios are honest about their own trade-off. The vertical east-west kit makes less electricity overall but you use more of it, because generation spreads across morning and evening when someone is actually home. Orientation changes when you generate, and for a kit without a battery, when you generate is worth more than how much.

Export income: assume zero. Getting paid for exported electricity through the Smart Export Guarantee generally needs an MCS-certified installation, and a kit you buy and fit yourself cannot be one. Every number on this page is about electricity you no longer have to buy, nothing more.

Are Aldi, Lidl, Amazon, B&Q or Screwfix Selling Compliant Kits?

No, none of them. Checked on 24 July 2026: Lidl and Aldi list no plug-in solar kit in Britain, and B&Q and Screwfix are not ranging them either. That is four months after the March 2026 announcement naming supermarket partners, and the gap between that announcement and an actual shelf is the thing to watch.

Amazon UK does list 800W kits, from EcoFlow and Hoymiles-class brands, built to Germany’s plug-in rules rather than a UK specification. Germany already caps the inverter at 800 VA and requires anti-islanding, so the engineering is close. The paperwork is not. Version 2 of the UK specification includes an explicit rule that where it and the German standard differ, the UK document wins, and a German-market unit will not arrive with a UK conformity assessment or, in many cases, a UK plug.

Retailers are not being timid here. Selling a kit that later fails the UK specification leaves them holding returns, and marketing one as plug-and-play before the law changes invites a consumer-protection complaint. The reasonable expectation is stock appearing within weeks of the first products being certified, not on 27 August itself.

If you want to know the moment that changes, the signal to watch is not a supermarket press release. It is a manufacturer publishing confirmation that a specific model has been assessed as compliant with the interim specification. That is the step everything else waits on.

What Should You Check on the Panels and Microinverter?

Which check applies depends on which route you are on, and this is where version 2 of the specification changed something practical. For the hardwired route, the ENA Type Test Register is still exactly what you want: it lists inverters with confirmed G98 approval, and that is what your electrician and your DNO care about. For socket use after 27 August, a register listing is no longer sufficient by itself. You need the manufacturer’s confirmation that the device has been assessed as compliant with the interim specification. Ask for it, and treat “it is on the ENA register” as an answer to a different question.

Next, check panel Voc against the inverter’s maximum input voltage. If you wire panels in series, their Voc values add together, and exceeding the inverter’s maximum can damage it. A 450W panel at roughly 41V Voc fits comfortably under the Hoymiles HMS-800W-2T’s 65V-per-channel limit; two in series would not.

Two 430-450W panels feeding one 800W inverter is normal, not a mistake. That is overpanelling: the inverter clips output above 800W regardless of how much DC the panels could theoretically produce, so pairing roughly 860-900Wp of panels against an 800W inverter is the standard configuration. The specification allows up to 2,000W of panels at STC against that same 800 VA inverter, so a kit that looks over-panelled to you is probably just built to the rules.

What Else Should Be in the Box?

DC cable length between panels and inverter is usually 1-2 metres. If your panels sit further from the inverter than that, budget for an extension. Confirm the AC plug fitted is UK BS 1363, not a German Schuko plug needing an adaptor; an adaptor on a generator connection is not something to improvise.

Most microinverters include Wi-Fi monitoring through a manufacturer app. Confirm it works from a UK account and does not need a separate hub sold as an extra. None of this affects safety, but it affects whether the kit you unbox matches what you expected to install.

What Should You Check on the Plug, Socket and Consumer Unit?

The specification requires a manufacturer-supplied, non-rewireable BS 1363 plug with a BS 1362 fuse rated at 5A or less already fitted. Do not swap the fuse for a higher rating, and do not fit your own plug if one arrives loose. Both undo the protection the spec is built around.

No extension leads and no multi-way adaptors, ever, even once the rules are final. Both can carry less current than the socket circuit is rated for, and both sit between the kit and the breaker that is meant to protect it.

Check the socket itself: a dedicated, unshared socket on a circuit in good condition, not the same double socket as a kettle and a heater. A consumer-unit label is part of the specification too, so the next electrician who opens your consumer unit knows a generator is connected downstream. For why the socket route is risky in the first place, including how a plug-in kit can hide an overload from the circuit’s breaker, see how plug-in solar actually works.

One more thing worth asking an electrician about: RCD type. Microinverters can put a small DC component onto the AC side, which an older Type AC RCD can miss; Type A or Type F is the safer choice. A UK safety study found most in-service RCDs already meet requirements, so this is a check, not an automatic replacement job.

What Should You Check on the Mounting System?

The specification requires manufacturer-supplied mounting backed by structural, weather, ventilation and fire evidence, not a generic bracket bought separately. That evidence is what stops a mount being sold for wind loads or a surface it was never tested against.

Wind restraint matters regardless of what the final spec says. A 500W+ panel presents roughly 2 square metres to a crosswind. Fence and wall mounts need two anchor points, top and bottom, and a mechanical stop if the panel can tilt. A panel that lifts in a gust and slams back breaks the glass and fractures the wiring harness, and standard home insurance will not cover it.

South, east, or west-facing surfaces all work: a balcony rail, a garden wall, a shed or garage roof, or a ground frame. South gets you the most generation; east-west spreads it across the day, which suits a household without a battery slightly better because more of it lands during waking hours.

For practical fixing advice by wall and roof type, see our mounting guide.

Should You Buy Hardware Now or Wait?

If you want true socket plug-and-play, wait, and wait for the right signal. That signal is a named product with published confirmation of assessed compliance, not 27 August arriving and not a supermarket listing appearing. Buying before that is buying on hope.

If you want generation this year, go hardwired now. A registered electrician fits the panels and microinverter to their own breaker, you notify your DNO under G98, and you are producing electricity legally this summer without waiting on anyone’s certification.

Do not buy at all yet if any of these apply: you already have roof solar and have not checked the whole-property G98 limit, you rent or are leasehold without written permission, your plan involves two kits or an extension lead, or the listing is German-market hardware sold as if the UK rules already match. That last one is the most common, and it carries a specific risk. Compliance needs a manufacturer-supplied UK plug and UK conformity evidence, and an existing German-spec unit may never get either retrofitted. You could end up owning hardware that works perfectly and still cannot legally go in a socket.

If you already have solar and are close to the 3.68kW G98 threshold, read the note on existing panels above before buying anything. An 800W addition can tip your whole property into a G99 application regardless of what the plug-in rules say.

If you rent, plug-in solar suits you because it needs no drilling or structural change, not because you have any statutory right to demand it. No UK law forces a landlord to allow it. Ask first, and expect the same “no certified product yet” answer that applies to everyone else.

Build a Hardwired Small-Solar System Now

What a hardwired 800W-class build costs today. Two 500W+ panels, one 800W microinverter, brackets and cabling, fitted to its own breaker by an electrician:

Two things carry over from the checklist above, wherever you source parts. Wind restraint is not optional (see the mounting section above for anchor points and mechanical stops), and this build is hardwired to its own breaker, never plugged into a socket. Nothing about 27 August changes that: the socket permission only ever applies to a certified product, and a set of parts you assembled yourself is not one.

You do not need a packaged kit. The same components are available individually from UK solar suppliers, often cheaper than a branded bundle. Here are two realistic builds using products from our panel directory, priced for the hardwired route above, not for a socket.

Budget Build: Single Panel (~£191)

Expected output: 350-450 kWh a year, south-facing at roughly 30 degrees. Assume 25-40% self-consumption without a battery and the 26.11p/kWh cap that runs to 30 September 2026: that offsets roughly £23-47 a year. Against the £191 hardware cost, payback runs roughly 4 to 8 years, before any electrician fee.

Standard Build: Two Panels (~£310-316)

Expected output: 600-700 kWh a year. At the same 25-40% self-consumption and 26.11p/kWh, annual savings run roughly £39-73. Against the £310-316 hardware cost, payback is roughly 4 to 8 years, before any electrician fee. This is still the sweet spot for most people, comfortably under the government’s £400-600 assumption for a branded 800W kit.

Prices are from UK solar retailers as of July 2026 and exclude VAT. The 0% VAT rate applies to installed (supply-and-fit) systems only, so a self-sourced DIY kit does not get it and you should not budget for a 20% discount. Check our solar panel prices tracker for the latest, as China’s export rebate removal continues to push prices.

Price the failure risk too. Panel warranties run 25 years, but microinverter warranties are often shorter than a realistic 5 to 10-plus year no-battery payback, which means the part most likely to fail is the part least likely to still be covered. German “pays back in two years” posts usually include free export on old reverse-running meters, which does not transfer to UK smart meters or to a kit you fitted yourself. Assume £0 export income and check the inverter warranty against the payback year before you buy.

The short version, on 24 July 2026: there is nothing to buy yet for socket use, the checklist above tells you what to look for when there is, and the hardwired route is available today if you would rather generate than wait. For the law itself see the plug-in solar UK guide, and for why a socket connection needed a new rule at all, see how plug-in solar works.

Nikola Nedoklanov

UK-based solar DIY enthusiast with 5+ years hands-on experience.

About the author

Published: April 3, 2026

Last updated: July 25, 2026