4 Billion Years On

UK Plug-in Solar Guide

Daily-updated UK Status, Products & Costs

The 5-second verdict

5 Aug · 10:00
Legal in the UK?
Partially
BS 7671 Amendment 4 published, DESNZ Interim Product Specification v2 published, but SI 2026/848 in force 27 Aug 2026.
How much?
From £349
Typical 800W kit · £70-£175/yr saving
Can I install today?
~Late August
Buy → plug in → notify your DNO (G98)
Payback period
3–4 yrs
Depends on location, usage & tariff
800W
The legal limit
One 800W AC device per circuit, via a standard 13 A socket
Panels can total more on the DC side – the micro-inverter clips output to 800W AC. G98 currently only allows one device per household, stricter than the one-per-circuit rule above - expected to loosen once G98 is amended. Plug-in batteries (with or without solar) are a separate, currently-unaddressed category - see below.
  • Solar only
  • +Solar + batteryNot yet in scope
  • Battery onlyNot yet in scope
Install stepsPayback calculatorUK kits todayLatest news

The 1-minute update

Legal & in the shopshigh confidence
Approx. late August 2026

SI 2026/848 comes into force, formally legalising plug-in solar and enabling wider retail launches of compliant products. Trade press expects major retailers to stock kits shortly after this date.

UK regulation timeline

past → future
  1. Mar 26
    Legalisation announced
  2. Apr 26
    BS 7671 Amend. 4 live
  3. Aug 26
    Legal & in the shops
  4. Oct 26
    Amend. 4 transition ends
  5. Apr 27
    Simplified SEG

About this page. A daily- refreshed, impartial UK guide to plug-in solar (also called balcony solar or Balkonkraftwerk) covering the legal status, the kits you can actually buy today, prices and payback, and how to pair – or replace – panels with a battery on a smart tariff. We re-research the regulations, products and prices every morning using Gemini against primary UK sources (gov.uk, BSI, Ofgem, mainstream UK press) so the figures you see below are never more than 24 hours old. We are editorially independent: any retailer link is disclosed and never affects what we list or rank.

Where things stand today

Legal in the UK?
Partially

BS 7671 Amendment 4 published, DESNZ Interim Product Specification v2 published, but SI 2026/848 in force 27 Aug 2026.

Verified 5 Aug 2026

Products on shelves?
Yes

Kits are on sale (EcoFlow) but marked pending full compliance until SI 2026/848 is in force 27 Aug 2026.

Verified 5 Aug 2026

SEG export payments?
No

SEG requires MCS certification, which DIY plug-in installs cannot get; simplified pathway expected ~2027.

Verified 5 Aug 2026

DNO notification needed?
Yes

G98 notification within 28 days of commissioning is mandatory for all plug-in solar installations.

Verified 5 Aug 2026

What changed since yesterday

  • 2026-08-05Updated EcoFlow STREAM Balcony Kit pricing and stock status based on current retailer information.

What is plug-in solar?

How plug-in solar worksSunlight hits a solar panel which feeds DC power into a combined micro-inverter and optional battery unit. The inverter converts the DC into 230 V AC and pushes it through a standard three-pin plug into the home wiring. The optional battery stores any excess for use later. The grid invisibly tops up whatever isn't being supplied.SUNfree fuelPANEL~400-880 W DCDC → AC INVERTER800 W max output+BATTERYoptional · 1-2 kWhINVERTER + BATTERYsingle 13 A plugYOUR HOMEself-consume firstGRIDtops up the rest

← swipe to see full diagram →

Most UK kits combine the inverter and (optional) battery into one box that plugs into a single 13 A socket. The grid invisibly tops up whatever isn't being supplied.

⚡ A battery-only version skips the panel entirely — useful for time-shifting cheap overnight electricity (e.g. on Octopus Flux) into peak hours.

Plug-in solar - sometimes called balcony solar, DIY solar, or by its German name Balkonkraftwerk - is a small photovoltaic system you install yourself and plug into a regular three-pin socket. A typical kit is one or two solar panels, a micro-inverter that converts DC from the panels into 230 V AC, and a standard UK plug.

Once plugged in, the inverter pushes electricity into your home's wiring. Anything you happen to be using at that moment - the fridge, the router, the kettle, your laptop charger - takes that solar electricity first, and the grid only tops up what's left. It's not a backup battery: when the panels stop producing, the grid takes over invisibly.

The legal limit is 800 watts (VA) of AC output per device. That's roughly enough to run an always-on "base load" - fridge, freezer, internet kit, a few standby devices - on sunny days. Most kits use one or two panels of around 400-450 W each, so panel input can be slightly higher than 800 W (the inverter clips the excess). How many devices you can have is a separate, currently unsettled question: DESNZ's Interim Product Specification itself only limits you to one device per final ring circuit, so a house with multiple ring circuits could technically have more than one - but the specification explicitly notes that the current GB network connection rules (Engineering Recommendation G98 Issue 2 Amendment 1 2026) are stricter and cap it at one device per household "unless and until that is amended". Until G98 changes, treat it as one device per household, not per circuit.

Plug-in solar will not power your house in a power cut. The inverter is required to detect a grid outage and shut off automatically ("anti-islanding") to protect engineers working on the network. To run essentials in a blackout you need a separate battery system with off-grid mode.

Plug-in batteries - on their own, or bundled with a plug-in solar kit - are a different, currently unaddressed category. DESNZ's Interim Product Specification and BS 7671 Amendment 4 explicitly exclude "plug-in battery systems" and "plug-in solar PV devices integrated with battery systems" from their scope, and a compliant plug-in solar device's instructions are required to carry an explicit warning against pairing it with a battery energy storage system. Products like the EcoFlow STREAM AC Pro or Zendure AIO 2400, which plug into a socket and time-shift electricity (charge overnight when cheap, discharge at the expensive evening peak) for a saving even without solar panels, sit in this gap: not banned, just not yet covered by the current specification. Separate legislation or a future specification revision may address plug-in batteries specifically - we'll update this page the moment that happens.

Is it legal in the UK yet?

Is your setup legal?

self-check
  • Sub-800 W AC kit, sold by a UK retailer
    Compliant with BS 7671 Amendment 4 and DESNZ's Interim Product Specification (SI 2026/848, in force 27 Aug 2026 - not a BSI standard). Plug straight into a normal 13 A socket.
  • You notify your DNO within 28 days (G98)
    Free online form, no approval required. We have a postcode → DNO finder lower down the page.
  • You tell your home insurer
    A simple note on the policy. Most insurers add it for free; not telling them gives grounds to refuse a claim.
  • Renting? Tell your landlord first
    Plug-in solar is portable, so it usually falls outside "alterations" clauses, but the Renters' Rights Act 2025 expects written notice. Use our landlord letter template.
  • Imported "Balkonkraftwerk" with no UK certification
    Anti-islanding (EN 50549), earth bonding and BS 1363 plug compliance may not be guaranteed. Avoid generic Amazon/eBay listings without a UK importer.
  • Hard-wired into a dedicated spur
    That is no longer "plug-in" - it becomes notifiable electrical work and needs an electrician under Part P.
  • Wall or balcony is cladding, timber, or under fire remediation
    ACM, MCM, HPL and timber cladding, plus timber balconies, are excluded outright by the spec - as is any building under external wall fire remediation.

The legal landscape for plug-in solar in the UK is in a transitional phase. BS 7671 Amendment 4, which addresses modern electrical installations including battery energy storage, was published on 15 April 2026 and became immediately effective, with a six-month transition period ending 15 October 2026. The Department for Energy Security and Net Zero (DESNZ) published its Plug-in Solar Device Interim Product Specification, version 2, on 16 July 2026. This specification is crucial as the Plugs and Sockets etc. (Safety) Regulations 1994 and Electricity Safety, Quality and Continuity Regulations 2002 (Amendment) Regulations 2026 (SI 2026/848) come into force on 27 August 2026. This statutory instrument formally defines "plug-in microgenerator" and requires compliance with the Interim Product Specification. Regulation 3 of SI 2026/848, which mandates compliance, extends to England & Wales and Scotland only, excluding Northern Ireland. Additionally, all plug-in solar installations require notification to the Distribution Network Operator (DNO) under G98 regulations within 28 days of commissioning. The next key date to watch is 27 August 2026, when SI 2026/848 comes into force, enabling wider retail availability of compliant products.

UK kits on sale today

Be wary of imported kits sold on Amazon and eBay aimed at the German or Spanish market. Some have been tested and found to lack proper UK anti-islanding (EN 50549), earth bonding for the panel frames, or BS 1363 plug compliance. Look for an explicit statement of UK compliance with BS 7671 Amendment 4.

Lidl
Parkside Plug-in Solar Kit
—
800 W AC
Unknown

Sold in Germany & EU; UK launch not yet confirmed — check lidl.co.uk

Lidl UKAmazon UK
EcoFlow
STREAM Plug & Play Solar System
£349
800 W AC
PendingOut of stock

From £349 — choose panel size (2×400 W to 4×250 W) and bracket on EcoFlow's site

EcoFlow UK£349

Amazon product-page links below use our Associates tag (UK/US/IE only, same as our book pages); other retailer links do not. Editorial choices are not influenced by it. See the full note at the foot of this page.

Top Tip - a cheaper way to start

SUNfree fuelMICRO-INVERTERplugs inWALLSOCKETScharges by day(excess solar)CHG68%512WhACACPORTABLEPOWER STATION£100–£200 · ~500 Whevening: plug straight inTVCONSOLE~30p/kWhsavedvs peak grid

A plug-in solar kit pays back faster if you also time-shift your evening peak - but you don't necessarily need to spend £1,000+ on a dedicated home battery to get a good amount of benefit. A £100-£200 camping power station can soak up the excess your panels generate in the middle of the day (when no-one's home to use it), then run your TV, computer, games console (e.g. teenager's bedroom) during the 5-7pm peak - capturing some of the saving that a full grid/plug-in battery would.

Plug-in solar systems can't yet sell power back to the grid, so any midday excess your panels produce while the house is empty is simply wasted. A small battery turns that wasted generation into ~30p-per-kWh of avoided peak-rate import - which is why storage is the single highest-value upgrade you can layer on top.

If just 5% of the UK's 28 million households shifted 1 kWh a day off the evening peak, that's 1.4 GWh moved daily and roughly 200-300 MW shaved during 5-7pm - the output of a small gas peaker plant, gone. Full write-up here.

Cheap power stations on Amazon UK

Portable power stations 1000Wh

Sweet-spot capacity for shifting an evening peak

EcoFlow River 2 Max

~512Wh, often £200-£300

Bluetti EB55

537Wh LiFePO4, plug-and-play

Search links - we earn a small commission on Amazon UK purchases at no extra cost to you.

Regulations deep dive

BS 7671 Amendment 4

BS 7671 Amendment 4:2026, the 18th Edition Wiring Regulations, was published on 15 April 2026 and became immediately effective. This amendment introduced substantial changes, including a new chapter on stationary secondary batteries, reflecting the growth of energy storage technologies. It also covers Power over Ethernet and functional earthing for ICT systems. A six-month transition period is in effect, meaning installations can comply with either the previous version or Amendment 4 until 15 October 2026, after which Amendment 4 is mandatory for all new low-voltage electrical installations, additions, and periodic inspections.

G98 connect-and-notify

G98, or Engineering Recommendation G98, is published by the Energy Networks Association (ENA) and sets the technical requirements for small generators, such as solar microinverters, to connect to the UK's low-voltage electricity network. It applies to fully type-tested micro-generators up to 16A per phase (approximately 3.68 kW on a single-phase supply). For plug-in solar, G98 notification is a mandatory post-installation process, typically submitted to the Distribution Network Operator (DNO) within 28 days of commissioning. This is a notification, not an application requiring prior approval, and the DNO cannot refuse a compliant installation.

Interim Product Specification

There is no dedicated BSI product standard for plug-in solar with a confirmed publication date. Instead, the operative document is the Department for Energy Security and Net Zero (DESNZ) "Plug-in Solar Device Interim Product Specification," version 2, published on 16 July 2026. The Plugs and Sockets etc. (Safety) Regulations 1994 and Electricity Safety, Quality and Continuity Regulations 2002 (Amendment) Regulations 2026 (SI 2026/848), in force from 27 August 2026, formally define "plug-in microgenerator" and require compliance with this Interim Product Specification. DESNZ's July 2026 response indicates that work will begin on a longer-term standard to succeed the IPS, developed with standards bodies and stakeholders. Regulation 3 of SI 2026/848, which mandates compliance, extends to England & Wales and Scotland only, not Northern Ireland.

How the UK compares to Europe

The UK's legalisation of plug-in solar brings it in line with other European countries where these systems are already widely used. In Germany, for example, over 1.5 million households had installed "Balkonkraftwerk" (balcony power plant) systems by mid-2025. These systems are also common in countries like Spain and the Netherlands. The UK's 800W AC output limit per device is consistent with limits seen in many European nations, allowing for significant energy generation without risking circuit overload. The ease of installation, without the need for professional electricians in many cases, mirrors the DIY approach popular across Europe.

England, Scotland, Wales & Northern Ireland

Most of this guide applies UK-wide for product safety and BS 7671, but who you notify and the exact paperwork can differ. Use your own country's network operator (NIE Networks in Northern Ireland; GB DNOs elsewhere).

  • England & Wales

    BS 7671 (IET Wiring Regulations) is the usual technical rulebook for domestic electrical work across England and Wales. Plug-in solar still requires you to notify your distribution network operator under the GB connect-and-notify rules in Energy Networks Association documents (commonly referred to as G98 for sub-16 A single-phase equipment). Wales follows the same product-safety and market framework as England for CE/UKCA equipment of this kind.

  • Scotland

    BS 7671 is widely applied in Scotland for domestic installations. Scottish building standards govern structural or notifiable building work on your home; a freestanding or balcony plug-in frame is not the same as a fixed rooftop array, but you should still complete DNO notification and tell your insurer. Scottish properties use the same GB distribution networks (for example SP Energy Networks in southern Scotland) and the same style of connection forms as in England.

  • Northern Ireland

    Northern Ireland genuinely diverges here, not just administratively: SI 2026/848's requirement to comply with the Interim Product Specification (regulation 3, amending ESQCR 2002) extends to England, Wales and Scotland only and is explicitly excluded from Northern Ireland - there is no equivalent NI instrument yet. NI also has its own electricity market oversight and NIE Networks as the distribution operator, so notification, export and small-scale connection paperwork can differ in detail from the G98-style process in Great Britain — check NIE Networks and the Utility Regulator for Northern Ireland for the current domestic microgenerator route before you plug in. Product safety (correct plug, inverter limits, instructions) still matters everywhere.

Plug-in vs rooftop

Plug-in solar is a great fit for some households and the wrong choice for others. If you own your roof, have an unshaded south-facing pitch, and use a lot of electricity, full rooftop solar will pay back faster per pound spent. Plug-in solar is the right answer if you rent, live in a flat or balcony, can't afford a £6,000+ install, or just want to dip a toe in.

Plug-in solarFull rooftop solar
Up-front costAround £400-£800 for an 800 W kitAround £6,000-£10,000 for a typical 4 kW system
Annual generation500-700 kWh in southern England3,500-4,200 kWh in southern England
Annual bill saving£70-£175£600-£1,000 (with a battery and a smart export tariff)
InstallationYou can do it yourself, no electrician requiredMCS-certified installer, scaffolding, planning
Get paid for export?Not yet - SEG simplification expected ~2027Yes, via the Smart Export Guarantee
Suitable for renters?Yes - portable, no permanent fix neededAlmost never - landlord and roof access required
Suitable for flats / balconiesYes - mounts on balcony rails or south-facing wallsNo

For full-roof solar costs, capacity, and SEG rates by country, see our energy dashboard and energy explainer.

Installation guide

  1. 1

    Check your consumer unit

    Your fuse board should be modern (RCD or RCBO protected). If you have an old re-wireable fuse board, ask an electrician to look at it before you plug in. Older houses with two-pin sockets won't work without an upgrade.

  2. 2

    Pick a sunny location

    South or south-west facing, unshaded between roughly 9 am and 4 pm in summer. A balcony rail, a south wall, a garden frame, a flat shed roof or a fence panel all work - but not on ACM, MCM, HPL or timber cladding, timber balconies, or any building under external wall fire remediation, which the Interim Product Specification excludes outright.

  3. 3

    Mount the panels securely

    Use the brackets supplied with your kit. Balcony rail brackets, ground frames and wall hooks are all available. Make sure the panels are tilted (typically 20-40 degrees) and cannot fall in high winds.

  4. 4

    Connect the micro-inverter

    The micro-inverter clips to the back of the panel or the mounting frame. Plug the panel DC cables into the inverter, then plug the inverter into a single dedicated 13 A socket. The AC lead and plug are factory-fitted and cannot be extended, cut or spliced, and the spec bans connecting through an extension lead, multi-way adaptor or RCD adaptor of any kind - whatever cable length the kit ships with is your working radius. The DC side (panel to inverter) is more flexible: manufacturers can supply routing connectors so a cable can pass from an outdoor panel to an indoor inverter, so siting the inverter inside usually means drilling a small cable-entry hole rather than running an extension lead. Total panel power up to 2,000 W DC is permitted, though the spec recommends professional assessment above 960 W.

  5. 5

    Plug in and check

    Once plugged in the inverter takes ~60 seconds to detect the grid frequency, then begins exporting. Most kits include a Wi-Fi monitoring app showing live output.

  6. 6

    Notify your DNO (G98)

    Within 28 days you must tell your Distribution Network Operator that you have a generator under 16 A per phase. The form is free, online, and takes a few minutes. Use our DNO finder below.

  7. 7

    Tell your home insurer

    Most insurers will note the system on your policy at no extra cost. Don't skip this step: failing to declare a generator can give the insurer grounds to decline a claim.

Payback calculator

Annual generation
816 kWh
regional estimate
Annual saving
£149
@ 26.1 p/kWh
Simple payback
3.3 years
good

In the SW postcode area, an 816 kWh/year output (per our regional UK yield table) would save about £149 a year at today's 26.1 p/kWh unit rate, paying the system back in 3.3 years. Adjust the slider above to model how much of your generation you actually use during the day.

Estimates only. Real-world output depends on shading, panel tilt, season, and the electricity price you actually pay. The calculator assumes excess generation above your self-consumption is exported for free (plug-in solar cannot use the Smart Export Guarantee yet); update if a simplified SEG pathway opens.

Batteries: with or without solar

Batteries are interesting in the UK even without solar. With a time-of-use tariff like Octopus Flux you can charge cheaply overnight and either run your home from the battery during the peak window, or sell back to the grid at a much higher rate. Below are three worked examples - choose the one that matches your situation.

Track 1

Solar + battery

A small battery captures sunshine you would otherwise have exported for free, and lets you use it in the evening - shifting up to twice as much of your generation into useful self-consumption.

Energy through pack
400 kWh/yr
Saving per kWh
26.1 p
Payback
6.7 yr

Annual saving £104. Each kWh stored avoids paying 26.1 p/kWh from the grid in the evening (currently no SEG is paid for plug-in solar exports).

Worked example assumes Self-consumed instead of free export. Round-trip efficiency and battery degradation will reduce real-world figures by ~10-15%.

Track 2

Battery-only on Octopus Flux

No solar panels at all. Charge the battery from the grid at the cheapest 5-hour window (around 9 p/kWh), then either run the house off it during the 4-7 pm peak (avoiding 41 p/kWh import) or sell it back to Flux at the peak export rate.

Energy through pack
1,700 kWh/yr
Saving per kWh
13.0 p
Payback
11.3 yr

Annual saving £220. Half of each cycle assumed exported to grid at 10.2 p/kWh, half used in-home displacing 25.8 p/kWh peak imports - both bought at the 5.0 p/kWh off-peak rate.

Worked example assumes Avg of in-home displacement and Flux peak export. Round-trip efficiency and battery degradation will reduce real-world figures by ~10-15%.

Track 3

Battery-only off-peak charging

Simpler still: any time-of-use tariff with a cheap overnight rate. Charge the battery during off-peak, run the house from it during the day. No export needed - the saving comes from displacing daytime peak imports.

Energy through pack
1,700 kWh/yr
Saving per kWh
21.1 p
Payback
7.0 yr

Annual saving £358. Each kWh is bought at the 5.0 p/kWh off-peak rate, then used in the day instead of paying the 26.1 p/kWh standard tariff.

Worked example assumes Daytime peak avoided. Round-trip efficiency and battery degradation will reduce real-world figures by ~10-15%.

Smart Export Guarantee: will you get paid?

The Smart Export Guarantee (SEG) is not currently available for DIY plug-in solar installations. SEG requires Microgeneration Certification Scheme (MCS) certification, which self-installed plug-in systems cannot obtain. Ofgem is expected to introduce a simplified pathway for plug-in solar to access SEG payments, but this is not anticipated until approximately 2027. Until then, any excess electricity generated by plug-in solar systems will be exported to the grid without payment.

Find your DNO

Within 28 days of installing your kit you must notify your Distribution Network Operator (DNO). The form is free, online, and takes a few minutes - no approval is required for sub-800 W plug-in solar. Enter your postcode below to find the right DNO.

Don't know your DNO? It's NOT the same as your electricity supplier - they own the cables, your supplier just bills you.

Landlord letter template

If you rent, the simplest path is to write to your landlord before installing. The template below references BS 7671 Amendment 4 (2026), explains that the kit is portable and reversible, and cites your right to request energy-efficiency improvements under the Renters' Rights Act 2025. Edit the bracketed sections, then send.

Preview the letterShow
Dear [LANDLORD NAME],

I am writing to let you know that I would like to install a small plug-in solar
system at [PROPERTY ADDRESS]. I wanted to share the details with you so that
you have everything you need on file.

What is plug-in solar?

A plug-in solar system is a small portable photovoltaic system - one or two
panels (around 800 W AC output) that plug into a standard three-pin socket. It
generates a small amount of electricity during daylight hours that the property
uses directly. It does not require any new wiring, sockets, or alterations to
the building.

Legal status

As of 15 April 2026, plug-in solar systems are recognised under BS 7671
Amendment 4 (the IET Wiring Regulations) and the G98 distribution code. The
government formally announced legalisation on 16 March 2026. From 27 August
2026, the Plugs and Sockets etc. (Safety) Regulations 1994 and Electricity
Safety, Quality and Continuity Regulations 2002 (Amendment) Regulations 2026
(SI 2026/848) formally define "plug-in microgenerator" in law and require
compliance with the government's Interim Product Specification. The system I
am proposing falls under the 800 W AC output threshold and will be installed
in line with the manufacturer's instructions and these regulations. The
property's walls/balcony are not ACM, MCM, HPL or timber cladding, nor a
timber balcony, and are not currently under external wall fire remediation,
so the installation is permitted under the specification's fire-safety
rules.

What it means for the property

- No drilling, no fixings to the structure - the panel(s) will be mounted on a
  free-standing frame / on the balcony rail using clip-on brackets / on a
  removable wall hook. (Pick whichever applies.)
- The panels are easily removable at the end of the tenancy.
- The system plugs into an existing socket; no electrical alterations are made.
- The system has anti-islanding protection (it disconnects automatically in
  the event of a power cut), so there is no risk to anyone working on the
  property's electrics.
- I will notify our Distribution Network Operator within 28 days of install
  (G98 form) and inform my contents insurer.
- The system improves the energy performance of the property at no cost to
  you. This is consistent with the energy-efficiency improvements that tenants
  have a right to request under the Renters' Rights Act 2025.

I would be grateful if you could confirm in writing that you are happy for me
to proceed. I am happy to send you a copy of the manufacturer's compliance
documentation and the G98 notification on request.

Many thanks,

[YOUR NAME]
[DATE]

Latest UK plug-in solar news

Updated daily
  • ·Trend Hunter

    Plug-In Solar Panels

    Plug-in solar panels are a new trend, according to Trend Hunter. This suggests growing interest in accessible solar technology.

    Read at Trend Hunter
  • ·The Next Web

    Solar hit a record 14.4% of UK electricity in July. Plug-in solar kits become legal on August 27.

    Solar power reached a record 14.4% of UK electricity in July. Plug-in solar kits will become legal on August 27.

    Read at The Next Web
  • ·TechRadar

    Solar energy just had its best-ever month in the UK — as the first plug-in solar kits prepare to go on sale within weeks

    The UK's solar energy sector experienced its best month ever. This coincides with plug-in solar kits preparing for sale within weeks.

    Read at TechRadar
  • ·Tech Digest

    5 things you need to know about UK’s new Balcony Solar Power law

    Tech Digest highlights five key aspects of the UK's new Balcony Solar Power law. This indicates important regulatory changes for consumers.

    Read at Tech Digest
  • ·The Cool Down

    In the UK, plug-in balcony solar goes legal later this month, with payback in 3 to 5 years

    Plug-in balcony solar becomes legal in the UK later this month, with a projected payback period of 3 to 5 years. This suggests a quick return on investment for users.

    Read at The Cool Down
  • ·Trusted Reviews

    Plug-in solar is coming, but the lack of battery support means that you might want to wait

    Plug-in solar is on its way, but a lack of battery support might make some consumers wait. This implies a potential limitation for early adopters.

    Read at Trusted Reviews
  • ·Dezeen

    Plug-in solar panels to be available in UK by end of summer

    Plug-in solar panels are expected to be available in the UK by the end of summer. This indicates an imminent launch for the new technology.

    Read at Dezeen
  • ·The Independent

    UK supermarkets to sell plug-in solar panels for £500. But there’s a catch

    UK supermarkets will sell plug-in solar panels for £500, but there's a catch. This suggests an affordable entry point with potential hidden drawbacks.

    Read at The Independent

Frequently asked questions

Is plug-in solar legal in the UK in 2026?

Yes. The government announced legalisation on 16 March 2026 and BS 7671 Amendment 4 took effect on 15 April 2026, recognising small plug-connected PV sources. DESNZ then published the final "Plug-in Solar Device Interim Product Specification" (version 2) on 16 July 2026 - this is a government document, not a BSI standard. From 27 August 2026, SI 2026/848 (amending the Plugs and Sockets etc. (Safety) Regulations 1994 and the Electricity Safety, Quality and Continuity Regulations 2002) formally defines "plug-in microgenerator" in law, lets plugs be approved against BS 1363 for this use, and requires compliance with that specification - in England, Wales and Scotland (this specific requirement does not extend to Northern Ireland). The 800 W AC output limit applies, you must notify your Distribution Network Operator within 28 days (G98), and you should inform your home insurer.

Can renters install plug-in solar?

In most cases yes. Plug-in solar is portable and does not require permanent fixings to the building, which puts it outside the scope of most tenancy clauses on alterations. The Renters' Rights Act 2025 also gives tenants stronger rights to make energy-efficiency improvements, and we provide a downloadable letter template you can send your landlord. Always check your tenancy agreement and notify your landlord in writing before installing.

Will it void my home insurance?

Not if you tell your insurer. A non-compliant or undeclared electrical installation gives an insurer grounds to refuse a claim, but a sub-800 W plug-in solar system installed in line with BS 7671 Amendment 4 is now an accepted modification. Notify your insurer in writing - most will simply add a note to the policy at no extra cost.

Do I need an electrician?

No, not legally, for a sub-800 W kit. The whole point of the new framework is that plug-in solar can be installed without notifiable electrical work. That said, if your consumer unit is old (re-wireable fuses, no RCD), get an electrician to look at it before plugging anything in.

How much money will I save?

A typical 800 W kit in southern England generates roughly 500-700 kWh a year. At current unit rates (24-27 p/kWh), savings range from around £70 a year for an average household to up to £175 a year if you use most of the power during the day - giving a headline range of £70-£175/yr. Government modelling put the typical figure at £70-£110 a year with a roughly 4-year payback; households where someone is home during the day, or with always-on loads, often do better.

Can I get paid for excess solar I send to the grid?

Not yet, for plug-in solar. The Smart Export Guarantee currently requires MCS certification of the install, and DIY plug-in installs cannot be MCS-certified. Industry expects Ofgem to introduce a simplified SEG route for plug-in solar in 2027. Until then you only save on electricity you self-consume - which is fine, because self-consumed kWh are worth more than exported ones anyway.

Can I add a battery to a plug-in solar system?

Not under the current specification. DESNZ's Interim Product Specification and BS 7671 Amendment 4 explicitly exclude "plug-in battery systems" and "plug-in solar PV devices integrated with battery systems" from their scope - and a compliant plug-in solar device's instructions are required to carry an explicit warning against pairing it with a battery energy storage system. This isn't a ban so much as a gap: separate legislation or a future specification revision may address plug-in batteries specifically, and some kits are sold with a bundled battery for the time-shifting benefit alone (see the next question) rather than as a certified combined system. Check current guidance before combining the two.

Can I use a plug-in battery on its own, without solar panels?

A standalone plug-in battery - such as the EcoFlow STREAM AC Pro or a Zendure AIO 2400 - plugs into the same 13 A socket and pushes up to 800 W AC into your home wiring, letting you charge overnight on a cheap time-of-use rate (e.g. Octopus Flux or Agile) and discharge during the expensive evening peak. This is a genuinely different product category from plug-in solar in law: it doesn't generate electricity from sunlight, so it was never going to be covered by legislation written specifically for solar generation, and DESNZ's specification explicitly excludes plug-in battery systems from its scope. Whether a given battery product is otherwise compliant with general UK electrical/product safety law is a separate question from the plug-in solar framework on this page - check the manufacturer's own UK compliance claims.

Do I need planning permission?

For panels mounted on a balcony rail, on a fence, in a garden, or on a wall in a non-conservation area, no - they are treated as portable equipment and fall under permitted development. For listed buildings, conservation areas, or panels mounted on the roof, check with your local authority.

Can I install plug-in solar on a balcony with cladding, or a timber balcony?

No. The Interim Product Specification bars installation outright on ACM, MCM or HPL cladding, on timber cladding, on timber balconies, and on any building currently under external wall fire remediation. Balcony rails and render or brick walls are fine. This rules out a meaningful share of post-Grenfell blocks with cladding remediation in progress, and any building finished in timber - worth checking before you buy a kit if you live in a flat.

Is plug-in solar different in Scotland, Wales or Northern Ireland?

Equipment rules and BS 7671 apply much the same across Great Britain, but Northern Ireland is genuinely different in law, not just administratively: SI 2026/848's requirement to comply with the Interim Product Specification (regulation 3, amending ESQCR 2002) extends to England, Wales and Scotland only - it is explicitly excluded from Northern Ireland. NI also uses NIE Networks and has its own regulatory setup - use its published microgenerator / connection guidance instead of assuming a GB G98 form is always correct. Scotland shares GB distribution operators with England (for example SP Energy Networks). See the England, Scotland, Wales & Northern Ireland section on this page.

Is the "Interim Product Specification" the same as a BSI standard?

No - this is a common mix-up (several UK guides get it wrong, some still claiming a BSI standard was due in July 2026 - that was the original March 2026 plan, since superseded). The document that plug-in solar kits must actually comply with is the "Plug-in Solar Device Interim Product Specification", published by DESNZ (the government department), not the British Standards Institution. BSI is referenced in the law only for BS 1363, the standard UK plug. A draft version 1.0 (June 2026) was withdrawn during consultation; the final version 2 published 16 July 2026, and SI 2026/848 (in force 27 August 2026) writes compliance with it into law. DESNZ's own July 2026 consultation response says only that "work will begin" on a longer-term standard to succeed the IPS, developed with "standards bodies and stakeholders" - no confirmed date, and no firm commitment that BSI specifically will be the (sole) author.

What is the 800 W limit and why?

The 800 W (VA) refers to the maximum AC output of a single micro-inverter. It is set conservatively so the system cannot overload the ring main if everything else on that circuit is also drawing power. You can have panels totalling more than 800 W of nominal DC output, as long as the inverter is clipped to 800 W AC - which all UK-aimed kits are.

Can I install more than one plug-in solar device in my home?

Not under the current framework - and this is a firmer "no" than it might first look. DESNZ's Interim Product Specification (the final version 2, published 16 July 2026) sets its own technical limit of one device per final ring circuit, so a house with several separate ring circuits could in principle host more than one. But the specification explicitly says this is subject to the existing GB network connection rules, and those rules - Engineering Recommendation G98 Issue 2 Amendment 1 2026, owned by the Energy Networks Association - currently recognise only one plug-in solar device per household, "unless and until that is amended". Because the IPS cannot override G98, the one-per-circuit figure is not yet operative: G98 is what actually governs your network connection today, and it caps you at one device per household regardless of how many ring circuits the property has. The government has signalled it wants G98 amended to move toward a per-circuit approach, but until that amendment is formally published, treat one device per household as the current rule, not just a cautious guess.

When is the revised G98 - allowing more than one device per household - expected?

There is no published timetable. G98 is an Engineering Recommendation owned by the Energy Networks Association (ENA), not DESNZ, so the amendment has to come through the ENA's engineering governance process in conjunction with DNOs and Ofgem - it is not something government can simply announce a date for. What we do know: DESNZ has committed to working with the ENA, DNOs and Ofgem to update G98 for plug-in solar, and the Interim Product Specification's own "unless and until that is amended" wording shows the authors already expected today's one-per-household rule to be a temporary, transitional state rather than the permanent position. Watch the ENA rather than gov.uk for the actual publication - it is their process that decides it.

What if my house has a power cut - can plug-in solar keep things running?

No. The micro-inverter has anti-islanding protection (required by EN 50549) which shuts the system off the instant it detects a grid outage. This is to protect engineers working on the network. To run essentials during a power cut you need a separate off-grid battery system with a transfer switch, which plug-in solar kits don't provide.

Will it work in winter or on cloudy days?

Yes, but at reduced output. UK plug-in solar typically generates 70-90% of its annual yield between April and September. On a bright winter day you might still see 100-300 W; on a heavily overcast day in December, output can drop to 20-50 W. The annual figures already account for this seasonality.

What about non-compliant kits sold on Amazon and eBay?

Imported kits aimed at the German or Spanish market and sold on UK marketplaces may not meet UK standards. Common issues include inverters that are not certified to EN 50549 (so anti-islanding behaviour is unverified), missing earth bonding for panel frames, and plug types other than BS 1363. Look for an explicit statement of UK compliance with BS 7671 Amendment 4 and DESNZ's Interim Product Specification (not a BSI standard - see the FAQ above). Avoid generic listings without a UK importer.

Glossary

Plug-in solar
A small PV system - typically one or two panels and a micro-inverter - that connects to the home via a standard three-pin plug rather than a hard-wired spur. Also called balcony solar, DIY solar, or Balkonkraftwerk.
Micro-inverter
A small inverter, typically clipped to the back of a single panel, that converts the panel's DC output into 230 V AC. UK-aimed micro-inverters are clipped to 800 W AC output.
Anti-islanding
A safety feature, required by the EN 50549 standard, that automatically shuts the inverter off within ~200 ms if it detects the grid has gone down. Protects engineers working on the network during a fault.
BS 7671
The IET Wiring Regulations - the standard that all UK electrical installation work must follow. Amendment 4, effective 15 April 2026, updates Chapter 712 to permit small plug-connected PV.
Interim Product Specification
Short for the "Plug-in Solar Device Interim Product Specification" - published by DESNZ (the government department), not the British Standards Institution. Version 2 published 16 July 2026, replacing a withdrawn June 2026 draft. SI 2026/848 requires compliance with it from 27 August 2026. A longer-term "enduring" standard is expected later, informed by real-world deployment evidence.
SI 2026/848
The Plugs and Sockets etc. (Safety) Regulations 1994 and Electricity Safety, Quality and Continuity Regulations 2002 (Amendment) Regulations 2026 - in force 27 August 2026. Defines "plug-in microgenerator" in law, lets a BS 1363 plug be approved for that use, and requires compliance with the Interim Product Specification. The compliance requirement extends to England, Wales and Scotland only, not Northern Ireland.
G98
The Distribution Network Operator notification standard for generators under 16 A per phase. Plug-in solar must be notified to the local DNO within 28 days of install. Free online form, no approval required. Its current issue (2 Amendment 1, 2026) is also what actually caps plug-in solar at one device per household today - stricter than the Interim Product Specification's own one-per-circuit rule - "unless and until that is amended".
DNO
Distribution Network Operator - the company that owns and runs the lower-voltage cables that bring electricity to your home. There are six DNO regions in Great Britain. Different from your electricity supplier.
MCS
Microgeneration Certification Scheme - the consumer-facing certification scheme for renewables installs. Currently a gateway to the Smart Export Guarantee. Plug-in DIY installs are not MCS-certifiable.
SEG
Smart Export Guarantee - the framework that pays households for electricity they export to the grid. Currently requires MCS certification. A simplified pathway for plug-in solar is expected ~2027.
kWh
Kilowatt-hour - the unit your electricity bill is measured in. A typical UK home uses about 2,700 kWh a year. An 800 W plug-in solar system in southern England generates about 500-700 kWh a year.
Self-consumption
The share of your solar generation that is used inside the home rather than exported. Self-consumed kWh save you the import unit rate (around 25 p), while exported kWh earn the export rate (around 12-15 p), so self-consumption is worth roughly twice as much.
Time-of-use tariff
An electricity tariff with different rates at different times of day. Octopus Flux, for example, charges peak (4-7 pm) and pays a high export rate during the same window, with cheap import rates overnight - which makes a battery valuable even without solar panels.

Primary UK sources

We research this page directly from the UK government and the electrical regulators every day, rather than from secondary press coverage. The links below are the same primary sources our daily Gemini brief grounds against — go straight to them if you want the original wording.

Enacted legislation

UK government (DESNZ)

Electrical regulators & standards bodies

We have no commercial or political relationship with any of these bodies. They are listed because they are the authoritative public sources for UK plug-in solar policy and safety.

Today's grounding citations

The additional pages Gemini's Google Search grounding consulted for today's refresh. Official UK sources are listed first; trade press and other secondary sources follow.

Editorial independence

4 Billion Years On is impartial. We are not a manufacturer, retailer or installer. The products listed above are chosen for editorial reasons - because they are relevant to the UK market right now - not because anyone has paid us to feature them.

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