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

Plug-in solar became legal in Great Britain on 27 August 2026, and you can buy a compliant kit today. When I read the ENA plug-in solar register on 2 September 2026 it listed 20 kits as Compliant, from five brands. Argos sells six of them, from £599, with delivery estimated late October. Thunder Energy sells two listed kits from £549.99 and ships now.

The conditions attached to that are the reason this guide exists. Which kits are actually listed, why the cheaper look-alikes on Amazon are not, what a compliant kit has to meet, what one costs, what it saves, and the one part of your own house that decides whether any of it applies to you.

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?

Yes, with conditions. Since 27 August 2026 a kit listed as Compliant on the ENA plug-in solar register may go into an ordinary wall socket without an electrician. On 2 September 2026 there were 20 such kits, from UKSOL, Perlight Solar, InstaGroup, Thunder Energy and City Plumbing.

Buying one is a different question from finding one. Argos is the only mainstream retailer ranging listed kits, and its six UKSOL bundles carry an estimated delivery of late October. Thunder Energy sells its own listed kits from £549.99 and ships now. UKSOL’s own store lists two kits from £699 collected. Octopus Energy is taking orders at £450 for a one-panel bundle (a 460W JA Solar panel, a Fox ESS microinverter, a 5 m cable with a three-pin plug and a mount) and £650 for two, delivery estimated at the end of September, with the price shown only after you enter a postcode. It is the cheapest branded kit in Britain and it is not on the register: the Octopus device listed on 25 August was marked Non-compliant and had gone from the plug-in category by 2 September. Until that changes, it has no socket route. InstaGroup is listed on the register and says coming soon.

Four conditions decide whether the socket route is open to you, and all four have to hold at once:

• The exact model is listed Compliant on the register on the day you order. Brand is not enough. InstaGroup has two models listed Compliant and a third listed Non-compliant.
• It will be the only plug-in device in the home. G98 Amendment 1, published in August 2026, now says so in terms.
• The RCD protecting that socket circuit is Type A, Type F or Type B, and works with power flowing both ways. A Type AC RCD is unsuitable, and a fuse board means an inspection first.
• You live in England, Wales or Scotland. The part of SI 2026/848 that makes the connection lawful does not extend to Northern Ireland, and no timetable has been published for it.

The third one is where most people stop, because it is about your consumer unit rather than the kit. I walk through reading your own board in a separate guide: is your home suitable for plug-in solar? For the law itself, and how it got here, see the plug-in solar UK guide.

You still have two routes, and the second one has not gone away. Buy a listed kit and plug it in yourself. Or go hardwired: 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 waits on no delivery date and no register entry, and it is priced further down this page.

What Is on Sale, and Which of It Actually Qualifies

Five brands hold the 20 compliant listings. Here they are, matched against where you can actually buy them.

Four entries carried a Non-compliant status on the same day: Anker’s Solix E5000 Pro with the RS50S panel kit, EcoFlow’s EF-PS-800, the TSUNESS TSOL-ESK800-U and the InstaGroup INS-PPG2-800. Non-compliant is a register status, not a safety verdict. It means the submission has not been accepted as demonstrating compliance. Either way, none of those has a socket route.

Statuses move in both directions, and entries disappear. Listings for Octopus Energy, Fox ESS, Segen and Modular Solar Technologies that showed Non-compliant on 29 August had left the plug-in category by 2 September. Absence from the register is not compliance. Check the exact model number on the day you order and take a screenshot.

Now the trap. Search Amazon UK for an 800W plug-in kit and you get an EcoFlow STREAM 800W microinverter with two 500W panels at £549, a 960W flexible panel set with an 800W inverter at £399.99, and a £139.99 Solarsys microinverter kit sold with a UK 13 A plug already fitted. None of those appeared as Compliant in the plug-in solar category on 2 September 2026. They look like the Argos kit, several cost less, and none has a legal route into a socket. Electrical Safety First makes a point worth repeating here: online marketplaces are not legally responsible for the safety of goods sold through them.

Battery kits are a separate exclusion, and it now sits in the law rather than the specification. SI 2026/848 defines a plug-in microgenerator as a device that is not designed to import electricity to store it. The EcoFlow STREAM Ultra, £898.99 on Amazon with 1.92 kWh of storage, is legal to buy and legal to own. It has no socket route, and it never will under this definition. Electrical Safety First goes further and says plainly: do not install plug-in battery systems in your home.

If you want the storage anyway, and plenty of people reasonably do, 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. One wrinkle to know about is that the new G98 wording does mention plug-in Electricity Storage. That is the network standard leaving room for a future case. The law has not followed it.

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. G98 Amendment 1 spells this out for plug-in kits: one may sit alongside permanently wired generation only if the aggregate registered capacity stays inside 16 A per phase at 230 V. A plug-in kit is not automatically “just plug in” for a home that already has solar, and a 4 kW roof array is over the line before you start.

What Does a Compliant Kit Need?

Two things, and the first one takes a minute. The exact model has to be listed as Compliant on the ENA plug-in solar register. Then the hardware has to meet the limits below, all of which come from version 2 of the interim specification, published 16 July 2026 and named in the law itself. Some listings you will see are genuinely compliant and some are German-market hardware relabelled for a UK audience, and the difference is not visible in the product photo.

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.

Read the register line carefully, because it is easy to over-read. A Compliant status means the manufacturer’s submission was accepted as demonstrating compliance with the specification. It is not a safety verdict on your house, and Non-compliant is not an accusation that a product is dangerous. Statuses have already moved both ways since 18 August, and whole entries have left the category. So check your exact model number on the day you buy, not the brand, and not what a review said last month.

One rule sits outside the product spec and catches people out. You get one plug-in device per household, and that is now settled rather than pending. Version 2 of the specification is written for one device per final ring circuit, with a note saying the grid connection rules restrict it to one per household unless they are amended. They were amended in August 2026, and the amendment went the other way. The scope clause of EREC G98 Amendment 1 permits a single plug-in microgenerator of 800 W or less, and then says it in one line: “Connecting more than one Plug-in Micro-generator is not allowed.” One home, one device.

How Much Does an 800W Kit Cost?

£549.99 to £1,199 for a listed kit, panels included. That is the real spread across every compliant kit I could buy on 2 September 2026. The cheapest is a Thunder Energy Bolt kit at £549.99. The cheapest at Argos is the UKSOL Pro Compact 515W at £599. The most expensive is the ground-mounted UKSOL Pro Duo 890W at £1,199. Every one of them includes the panels, the microinverter, the frame and the cable.

There is no compliant kit with a battery in it, at any price. Storage is excluded by the law’s own definition, so a kit-plus-battery price range no longer exists for the socket route. If you see one quoted, it is either an off-grid product or a page written before 27 August.

The hardwired row looks better on paper and it is, on hardware alone. Add £80 to £150 for the electrician who ties it into its own breaker and the two routes converge. What you are really choosing between is a fitted price with a delivery date and a cheaper price with a trade booking. Both are legal. Only one needs a register listing.

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. It is also worth seeing that the June assumption of £400 to £600 for a branded packaged kit sat below where the first real UK kits landed.

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: £43 to £84 a year. 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, the Ofgem price cap unit rate to 30 September 2026, that is £43 to £84.

Worked through: 650 kWh x 25% x 26.11p is about £43. 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 has a shelf life, but a short move in it barely registers. Ofgem published the October to December cap on 26 August 2026: 26.32p/kWh, with a standing charge of 54.83p a day. Running the same arithmetic at 26.32p moves the range by less than a pound at either end, so £43 to £84 holds through the winter quarter.

A battery does not change this number, because no compliant kit has one. If you buy storage anyway, you are buying an off-grid or hardwired product and the socket rules stop applying to it. Price it on its own terms.

Payback: 7 to 14 years on the £599 Argos kit. Divide £599 by £43 and you get 14 years. Divide it by £84 and you get 7. On the £1,199 kits it is longer, and not proportionally better, because the second panel adds daytime output a household that is out all day cannot use. That is longer than most people expect, and it is much longer than the two to four years you will see on kit listings.

The government’s number, and why I do not use it. The gov.uk press release of 26 August 2026 says households “could save up to £110 a year” and that a kit provides “up to 20% of average home electricity use”. It publishes no basis for either figure: no self-consumption rate, no unit rate, no generation figure, no orientation. Both are “up to” numbers. Treat £110 as the ceiling for someone at home all day with a south-facing kit, not as a forecast. The earlier DESNZ analytical annex, below, is the only published working I have seen that lands near it.

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.

That may change, and it would matter. British Gas said on 27 August 2026 that it is working on export tariffs for plug-in customers and expects good news soon. On 2 September nothing is live, and no supplier has published how a kit without MCS certification would qualify. If a 12p export rate ever arrived, the 60 to 75% of output a working household gives away is worth roughly £50 to £70 a year, which would about double the value of a kit. Until a tariff exists, it is worth £0. Do not buy on the promise.

Where Can You Buy a Compliant Kit? Argos Yes, Lidl and Aldi No

Argos, Thunder Energy and UKSOL direct. Checked on 2 September 2026: Argos is the first mainstream retailer with listed kits, and the range is UKSOL. Six bundles, free delivery, estimated delivery late October on every one.

Every one of those clips to 800W AC whatever the panel wattage says, which is why a 1,260W kit still registers at 0.8 kW. Two lines in the small print matter more than the price: the ground-mount kits need ballast that is not included, and both Argos and UKSOL state the range is not suitable for balconies. Wind loading on a rail is the reason, and it is a fair one.

Beyond Argos, a few more sellers are worth knowing about. Thunder Energy lists its Bolt 400W and 900W kits from £549.99 and, unusually, sells a paid installation and network-notification service at £399.99 in Greater London. UKSOL’s own store has the Compact 460W at £699 collected or £849 delivered, and the Duo 890W at £1,089 collected or £1,199 delivered. Octopus Energy is taking orders on a JA Solar bundle for delivery estimated end of September, but it shows no price until you enter an address, its product page carries no compliance statement, and its register entry has gone from the plug-in category. Check the exact model before you order there. InstaGroup is listed on the register and its page says coming soon.

Lidl and Aldi still sell nothing in Britain on 2 September 2026, five and a half months after the government named supermarket partners preparing UK launches. B&Q, Screwfix, Wickes and Toolstation showed no complete plug-in kit either. Amazon has plenty of kits and none of them listed Compliant, which is the subject of the next few lines.

Amazon UK lists plenty of 800W kits, much of it built to Germany’s plug-in rules rather than the UK specification. Germany also 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 says that where it and the German standard differ, the UK document wins, and a German-market unit does not arrive with a UK conformity assessment or a register entry.

A UK plug fitted to the box is not evidence of anything either. The £139.99 Solarsys microinverter kit on Amazon ships with a UK 13 A plug and has no compliant listing. The plug is the easy part to change. The conformity assessment behind it is not.

So the signal to watch is not a supermarket press release. It is the register. When a brand you want appears there as Compliant against the model number printed on the box, that brand has a socket route. Until then it does not, whatever the listing says.

What Should You Check on the Panels and Microinverter?

Which check applies depends on which route you are on, and the two use different parts of the same register. For socket use, search the ENA register under the Plug-in Solar device type and find your exact model listed Compliant. For the hardwired route, you want an inverter with a confirmed G98 type-test entry instead, which is what your electrician and your DNO care about. A G98 entry does not give a product a socket route, and a plug-in listing is not a substitute for the G98 check on a hardwired build.

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. Electrical Safety First puts cable reels, travel adaptors and RCD adaptors in the same list, and rules out lighting circuits and circuits feeding fixed equipment such as an oven or a hob. Argos repeats the extension lead and cable reel point on every UKSOL listing. All of them can carry less current than the socket circuit is rated for, and all of them 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.

Then the part that decides whether you can buy at all: the RCD protecting that socket circuit. This is the check the safety bodies put front and centre when the law changed on 27 August 2026, and it is about your house rather than the kit.

• Type AC is unsuitable. Electrical Safety First says a Type AC RCD may fail to give suitable protection in a fault, because a microinverter can put a small DC residual current onto the AC side that this type cannot see.
• Type A, Type F and Type B are suitable. Type A tolerates DC residual above 6 mA, Type F above 10 mA.
• The type is not the whole test. The device also has to be capable of working with power flowing both ways, and Electrical Safety First is blunt that few RCDs or RCBOs can be easily identified as bidirectional by a consumer. Some carry a BD or Bi-dir suffix. It is not consistent.
• A fuse board is a stop sign. Homes still on rewirable or cartridge fuses have no RCD protection at all and need an inspection before anything is plugged in.

The IET’s own survey explains why the bodies pushed this so hard: 25% of UK adults know their RCD type, 37% do not know what an RCD is, and 23% said they would reach for an extension lead if the cable did not reach. If you are not sure which camp you are in, work through the home suitability check before you order anything. It starts with the label on your consumer unit, and it is cheaper than a return.

One habit worth keeping afterwards. Leakage from EV chargers and ordinary electronics adds up and can desensitise an RCD over time, so press the test button on the board every few months.

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 whatever the specification 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 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. A balcony rail is the exception on the socket route: the UKSOL kits Argos sells are stated as not suitable for balconies, so a rail is a hardwired-build surface for now.

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

Should You Buy a Listed Kit or Hardwire?

The question is no longer whether to wait. It is which of the two legal routes fits you, and the honest split is about timing and about where the panels are going to sit.

Buy a listed kit if you want the simplest path and you can wait for delivery. Argos will take your order today and estimates late October. Thunder Energy has stock now and costs less. You plug it in yourself, you notify your DNO, and no electrician is involved unless your consumer unit fails the RCD check above.

Go hardwired if you want generation before late October, if you want to choose the panels and inverter yourself, or if you already have roof solar and are close to the G98 ceiling anyway. An electrician fits the kit to its own breaker and handles the notification as part of the job. The parts cost less than a packaged kit and the fee closes most of the gap.

Two lines in the compliant kits’ small print change the answer for some people. The UKSOL range, which is every kit Argos sells, is stated by both Argos and UKSOL as not suitable for balconies. The ground-mount versions need ballast that is not in the box, so budget for slabs or a weighted frame. If your only outdoor space is a railing, the compliant product for you does not exist yet, and a hardwired build with a properly engineered rail mount is the route that does.

Do not buy either way if any of these apply: your consumer unit has a Type AC RCD or a fuse board and has not been inspected, 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 an import sold as if the UK rules already match. That last one is the most common failure. An unlisted unit may never get a UK conformity assessment retrofitted, so you can 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 or freeholder to allow it, and legalisation did not change that. Ask first, get the agreement in writing, and check the balcony point above before you picture the panels on a railing.

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. Legalisation did not change that: the socket permission applies to a listed product, and a set of parts you assembled yourself cannot be 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.

Component 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, and the UKSOL kits at Argos carry a 10-year warranty, but microinverter cover is often shorter than a realistic 7 to 14 year payback. That 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 2 September 2026: you can buy a compliant kit from £549.99, Argos delivers in late October, the register decides which models qualify, and your RCD decides whether your house does. The hardwired route is still there if you would rather generate now 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: September 2, 2026