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Plug-In Solar in the UK: What You Can and Cannot Do

Since 27 August 2026, plugging a small solar kit into an ordinary UK household socket has been lawful — for a specific category of product, within specific limits. This page is the practical answer to what that actually means: what you are allowed to do, what to check before you buy, and what remains off-limits regardless of what a retailer’s listing implies. For the legal history and primary-source citations, see the status tracker and what SI 2026/848 changed; for how the technology itself works, see how plug-in solar works. Nothing on this page is a hands-on test of any product — it is a plain-English reading of the legislation and the Government’s own technical specification, kept current as the detail settles.

What you can now do

You can buy and connect a plug-in solar device directly to a standard UK wall socket, without hiring an electrician and without waiting for approval from your Distribution Network Operator (DNO) before switching it on, provided the device meets the Plug-in Solar Device Interim Product Specification (IPS), version 2. That is the entire point of SI 2026/848: it creates a narrow, conditional exception to rules that previously required every socket-connected generator to go through a full hardwired installation.

Meeting the specification is the condition, not a formality. A device that does not carry the compliance marking described below gets none of the benefit of the exception and remains exactly as unlawful to connect as it was before 27 August 2026.

The limits that apply

The exception is narrow by design. Every limit below comes from the IPS itself or from the instrument that names it.

  • 800 VA / 3.5 A maximum output. Measured at the inverter’s output terminals, not the wattage of the panels feeding it.
  • Up to 2,000 W of solar panel capacity is permitted behind that inverter ceiling — panels routinely produce less than their rated output outdoors, so oversizing the array relative to the inverter is normal, not a loophole.
  • Above 960 W of panel capacity, a professional assessment of your existing wiring is advised before connecting. That threshold is borrowed directly from the German technical standard DIN VDE V 0126-95, which the IPS cites explicitly as its source.
  • Anti-islanding protection is mandatory. The inverter has to disconnect from the mains automatically within 100 milliseconds of losing the grid supply, with the voltage at the plug pins falling below 34 V inside that same window — again taken from DIN VDE V 0126-95.
  • Solar only. The exception covers devices that generate electricity by direct conversion of sunlight. Wind, hydro or any other plug-in generation technology is out of scope entirely.

One device per household — not one per circuit

This is the limit most UK coverage of this reform gets wrong, and it is worth stating plainly because it changes what “compliant” actually means in practice.

The Interim Product Specification itself permits one plug-in solar device per final electrical circuit in a home. If that were the only rule in play, a house with several ring circuits could run several devices. But it is not the only rule in play: Engineering Recommendation G98, the separate network-connection standard that governs how generators connect to the grid, restricts installations to one device per household in total — and the Government’s own technical specification says this G98 restriction continues to apply “unless and until” G98 itself is amended to say otherwise. No date for that amendment has been published.

In practice: expect to be limited to a single plug-in solar device per household at launch, however many circuits your home has. A second device is not simply a matter of finding a spare circuit — it needs G98 to change first, and that has not happened yet.

Battery storage is not part of this exception

This is the single most important thing to get right if you are coming to UK rules with any familiarity with how plug-in solar works elsewhere in Europe: the UK exception explicitly excludes battery storage. The legal definition of a “plug-in microgenerator” specifically requires that the device is not designed to import electrical energy for the purpose of storing energy for later supply. A device with an integrated battery, or any battery added to store surplus daytime generation for use in the evening, does not meet that definition and gets none of the benefit of SI 2026/848 — regardless of how small the battery is. The Government’s specification goes further and mandates a prominent warning against connecting one of these devices to a storage product.

This was a deliberate choice, not an oversight. The Government’s consultation response records that plug-in battery products were considered and left out of scope on purpose, citing additional technical and regulatory questions that had not been assessed as part of this work. If you are looking for stored, dispatchable solar power from a socket-connected device, that is a different, unresolved regulatory conversation — not something this reform covers.

What to check before you buy

This page does not review, score or recommend specific products. Every page in this cluster is research-based rather than hands-on tested; what follows is what the specification itself requires a compliant device to carry, so you can check any product against it yourself:

  • A permanent marking declaring compliance with the Interim Product Specification, plus the manufacturer’s name and contact details, model and serial number, and rated values (voltage, frequency, maximum current, rated power).
  • A non-rewireable, moulded BS 1363 plug fitted with a BS 1362 fuse rated no higher than 5 amps, with partially insulated pins.
  • Listing on the Energy Networks Association’s Type Test Register — submitting a device for registration is not, by itself, enough; it has to be assessed and confirmed before the device is placed on the market.
  • A label stating that only one inverter, up to 800 VA, should be connected per circuit, with the one-per-household caveat above noted, and that notification to your network operator is mandatory.
  • A prominent warning against connecting the device via an extension lead, multi-way adaptor, RCD adaptor or travel adaptor.
  • A prominent warning against use with any battery storage product, for the reason above.

As of commencement there is no dedicated conformity mark for plug-in solar comparable to the CE or UKCA mark — the Government has said it will consider one as part of future standards work. For now, the declaration of compliance and the Type Test Register listing are what a compliant product should carry.

What you still have to do before switching it on

  • Get your existing wiring checked if you have any doubt about it, and certainly above the 960 W panel threshold. The IET’s standing advice is that a home’s electrical installation should be professionally checked for suitability before using any plug-in generation equipment — older wiring and RCDs were not designed with reverse power flow in mind, and that advice does not change because the product is now lawful to sell.
  • Notify your DNO under G98, even for a single small device. The Energy Networks Association’s “fit and inform” process lets a Type Tested generator be commissioned first, with the network operator told within 28 days — there is no fee and no need to wait for approval before switching on, but the notification itself is not optional. See grid connection and safety for the full process.
  • Check your tenancy, lease or building rules if you do not own the property outright. SI 2026/848 changes electrical-safety law; it grants no new right to install anything against a landlord’s, freeholder’s or managing agent’s wishes. See the UK renters and leaseholders position — the UK has no equivalent of Germany’s statutory tenant right.
  • Check your home insurance. The Government’s own guidance tells buyers to check, before installation, whether the device affects a building or contents policy — the product being lawful to sell does not make that check redundant.

What is still not allowed

  • A second device per household, until G98 is amended — see above.
  • Any battery-integrated or storage-paired device — excluded from the definition entirely, not just discouraged. See above.
  • Non-solar plug-in generation — wind or any other technology is out of scope.
  • Connecting via an extension lead, multi-way adaptor, RCD adaptor or travel adaptor — the exception covers a direct plug-to-socket connection only.
  • An uncertified device, or one that does not carry the marking and Type Test Register listing described above — for that product, nothing changed on 27 August 2026.
  • Claiming Smart Export Guarantee payments. Plug-in solar devices are unmetered for export and are not installed by an MCS-certified installer, so they do not qualify for SEG — your saving comes entirely from electricity you would otherwise have bought, not from anything you export.

Northern Ireland

The position in Northern Ireland is genuinely different, not a regional variation of the same rule. SI 2026/848 does two separate jobs: the product-and-plug amendment (regulation 2) extends to England and Wales, Scotland and Northern Ireland; the grid-connection amendment (regulation 3) — which is what actually lets a compliant device be connected to the network under the simplified route — extends to England and Wales and Scotland only. Engineering Recommendation G98 itself is a Great Britain standard; Northern Ireland runs on its own separate connection framework (G98/NI), and the specification notes that applying the new rules there “is subject to further consideration and may require amendment.” No instrument or timetable resolving the Northern Ireland connection position has been published as of this writing. If you are in Northern Ireland, do not assume the 27 August 2026 date applies to the connection side of this reform.

Frequently asked questions

Can I install more than one device if my house has several circuits?

Not yet. The specification permits one device per circuit, but the separate G98 network rule caps installations at one per household until G98 is amended — see above. Treat one per household as the real limit until that changes.

Can I add a battery to store what I do not use straight away?

No. Battery storage is excluded from the legal definition of a plug-in microgenerator entirely — see above. A battery-paired device gets none of the benefit of this exception, whatever its size.

Do I still need to tell my network operator if the device is small?

Yes. G98 notification is not optional, and it does not become optional because the generator is small enough to plug into a socket. The “fit and inform” route removes the need for prior approval, not the need to notify at all.

Does this apply in Northern Ireland?

The product side does; the connection side, which is what actually lets you use the device this way, does not — see the Northern Ireland section above.

Is a plug-in solar kit worth it?

That depends on your own usage pattern and the real installed cost of a compliant product, not on the legal change itself. See costs and payback for the method.

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