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

You can buy plug-in solar hardware in the UK today. You cannot legally plug it into a wall socket yet, and no product can be certified as compliant until the government finishes writing the rules. This guide is the checklist: what a compliant kit will need, what it costs, what it actually saves, and the one route that is legal right now.

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, you can buy the hardware. No, you cannot legally plug it into a UK socket. No product can be certified against the UK spec yet either, because that spec is still a draft. DESNZ published it on 16 June 2026, its consultation closed 30 June, and a government response is expected around 22 July 2026.

That response is not guaranteed to land on 22 July, and it could change any of the draft requirements below. For the full regulatory timeline and what has actually changed so far, see our plug-in solar UK guide.

Today you have two lawful positions, not one. You can wait: hold off buying until the rules are final, then buy a certified kit and plug it in yourself. Or you can buy now and go hardwired: have a registered electrician fit the panels and microinverter to their own breaker and notify your DNO under G98, exactly like a small roof array. That route needs no new product standard, because it already exists.

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?

DESNZ’s draft interim product specification sets out what a plug-in kit will need to meet before anyone can call it compliant. Nothing here is final. The government response, expected around 22 July 2026, could soften, tighten, or drop any line below. Treat this as the current draft, not settled law.

Two numbers on that list do most of the work. 800 VA is the ceiling on what the inverter can output, which is why every kit already on sale tops out at 800W. 960 W of panels is the point above which the draft wants a professional wiring check, not a full rewire, just a qualified look before you connect.

Those two numbers are the same limit, not two separate ones. UK mains runs at roughly 230V, and 800VA divided by 230V is about 3.5A. The current cap falls straight out of the power cap; it is not an extra restriction layered on top.

How Much Will an 800W Kit Cost?

DESNZ’s own working assumption, from the interim specification’s economic assessment, is £400 to £600 for an 800W kit. That figure excludes installation and any ancillary costs such as mounting hardware or an electrician, so treat it as a hardware floor, not an all-in price.

Lined up side by side, the government’s own number and what is actually on sale agree more than they disagree:

On Amazon UK, checked in July 2026, EcoFlow and Hoymiles-class 800W kits list at roughly £400-500. That sits inside the government’s range, at the cheaper end. Add mounting hardware and cabling if the kit does not include them, and budget toward £600 rather than £400 if you want a figure you are unlikely to exceed.

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 £400-600 is the kit; the install around it is not always free.

How Much Could Plug-in Solar Save?

Our default, conservative estimate. Without a battery, you only benefit from generation while you are home and using electricity. For a UK household away at work during the day, realistic self-consumption is roughly 25-40%. At the current price cap of about 25p/kWh, an 800W kit making 650-800 kWh a year offsets roughly £40-80 a year.

Worked through: 650 kWh a year × 25% self-consumption × 25p/kWh is about £40. 800 kWh a year × 40% self-consumption × 25p/kWh is about £80. That is the whole calculation; there is no hidden multiplier and no export value included.

Payback. At £40-80 a year against a £400-600 kit, payback is realistically 5 to 10-plus years. That is longer than most people expect, and it is before you add any installation cost.

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-September 2026 Ofgem price cap. Loosen any one of those assumptions and the real number moves toward our £40-80 default above.

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 self-consumption is worth more than raw output.

Export income. Assume zero by default. Getting paid for exported electricity through the Smart Export Guarantee generally needs an MCS-certified installation, and a self-installed plug-in or hardwired DIY kit is not one. The value here is offsetting electricity you would otherwise buy, nothing more.

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

No, and none can, yet. As of July 2026 no UK retailer sells a plug-in kit that is compliant, because no kit can be certified before the rules are finalised.

Amazon UK lists 800W kits from EcoFlow and Hoymiles-class brands, built to Germany’s own plug-in rules rather than any UK spec. Germany already requires an 800 VA cap, a specific plug, and anti-islanding protection, but that is a different country’s standard. A socket connection here stays non-compliant regardless of what a kit meets abroad.

Lidl and Aldi are not stocking plug-in kits in the UK, verified 2 July 2026. B&Q and Screwfix are not ranging them either. Expect that to change once the government response, and any product standard that follows it, give retailers a spec to sell against.

Retailers are not being overly cautious. Selling a kit that later fails to meet the final UK spec leaves them holding returns, and marketing one now as “plug and play” when it is legally not risks a consumer-protection complaint. Expect stock to appear within weeks of the standard publishing, not before it.

What Should You Check on the Panels and Microinverter?

Start with the microinverter’s G98 status. The ENA Type Test Register lists inverters with confirmed G98 approval; the EcoFlow Stream (EFWN511) has held one since October 2023. Hoymiles products are common in Germany, but confirm UK G98 status on the register before buying, not from the box.

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, not a red flag.

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 draft 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 draft spec 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 draft 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?

Waiting costs you one summer’s generation, roughly £40-80 in offset electricity on an 800W kit, our conservative default from the savings section above. That is a real but modest cost.

Buying German-market hardware now carries a different risk: it may never qualify under the final UK rules. Compliance needs a manufacturer-supplied UK plug and UK-specific conformity evidence, and an existing German-spec unit may never get either retrofitted. You could end up with hardware that works, but that you still cannot legally plug into a socket.

The hardwired route sidesteps the wait entirely. Buy now, have a registered electrician fit it to its own breaker, notify your DNO under G98, and you are generating and saving this summer, legally, without waiting on a government response.

If you already have solar and are close to the 3.68kW G98 threshold, read the “already have solar panels” note earlier before buying anything: an 800W addition could tip you into a G99 application regardless of what the plug-in rules eventually say. If you are starting from zero with no fixed deadline, waiting costs you the least; buying German-market hardware now carries the most unresolved compliance risk.

If you rent, plug-in solar suits you because it needs no drilling or structural change, not because of any statutory right to demand it. There is no UK law forcing a landlord to allow it. Ask first, and expect the same “not yet compliant” answer from your landlord 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.

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 today’s price cap of about 25p/kWh: that offsets roughly £21-45 a year. Against the £191 hardware cost, payback runs roughly 4-9 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 25p/kWh, annual savings run roughly £37-70. Against the £310-316 hardware cost, payback is roughly 4-9 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; a self-sourced DIY kit does not get it automatically, so ask your supplier before assuming a discount. Check our solar panel prices tracker for the latest, as China’s export rebate removal continues to push prices.

Nikola Nedoklanov

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

About the author

Published: April 3, 2026

Last updated: July 3, 2026