Plug-in solar is a small solar PV system, usually one or two panels paired with an 800W microinverter, designed for a balcony, an external wall, or a small garden. It generates electricity during daylight that offsets what your home is already using. It is also called balcony solar. Owning and generating with one is legal in the UK. The part that needs care is how it connects to the grid, and that is what most of this page is about.
On this page
What plug-in solar is
A traditional rooftop solar system is a large, fixed, professionally scaffolded installation of ten or more panels. Plug-in solar is the opposite end of the scale. It is one or two panels, an 800W microinverter that converts the panels' direct current into mains-compatible alternating current, and a mounting frame for a balcony rail, a wall, or the ground. The whole system is small enough that a single person can handle it, and in most cases it is designed to be moved if you change address.
The 800W figure is not arbitrary. It matches the ceiling that the UK engineering recommendation ENA EREC G98 sets for the simplest grid-connection route, and it lines up with the limit used across the EU balcony-solar market. Anything larger moves into the territory of a conventional hardwired multi-panel system.
Plug-in solar does not power your home on its own and it does not disconnect you from the grid. It quietly reduces the amount of electricity you import while the sun is up. On a typical UK setup an 800W system generates somewhere between 600 and 700 kWh a year, and the saving depends heavily on how much of that you use directly rather than export.
Is plug-in solar legal in the UK?
This is the question that brings most people to the topic, and it deserves a precise answer rather than a slogan.
Owning a plug-in solar system and generating electricity with it is legal. There is nothing unlawful about the equipment. What matters is the connection method, and here the UK picture in 2026 is specific:
- BS 7671:2018 + Amendment 4:2026, the IET Wiring Regulations published 15 April 2026, updated Section 712 to authorise plug-in solar via a standard plug for kits meeting the forthcoming DESNZ Interim Product Specification, up to 800W AC peak.
- BS 1363-1:2023 governs UK 13A plugs, sockets and adaptors. UK 13A sockets are designed and approved as power outlets, not as inlets for externally generated power. They do not currently cover backfeeding through a 3-pin plug.
- The DESNZ Interim Product Specification, expected to publish in July 2026, is a product specification at the kit level. Its publication is what makes the BS 7671 A4 plug-in route practically usable, because no kit can be certified until the standard exists.
Put together: the regulatory framework for plug-in solar via standard plug is in place as of 15 April 2026. What is left is the Interim Product Specification publishing on or close to its 30 June 2026 consultation close, and the first kit being certified. Until that happens, no certified plug-in solar kit yet exists, so the practical install for buyers today is still a CPS-registered (Competent Person Scheme) electrician with a hardwired connection plus G98 notification.
Could DIY plug-in solar become feasible? The likely direction
The position above is the position in 2026. Looking ahead, a growing view among electricians and trade bodies is that a true DIY route could open, and that it may not require BS 1363 to be rewritten. The argument: if the inverter and kit are certified to a strict product standard, the kit's own electronics guarantee safe behaviour, so a certified product on a sound, RCD-protected circuit could be made safe by engineering rather than by a bespoke install. This is broadly how Germany reached a workable plug-in connection.
A certified product would have to prove rapid shutdown, anti-islanding, automatic disconnect, no exposed live pins, export limiting, compliant voltage and frequency behaviour, and safe operation on ring circuits, which between them engineer out the live-pin-during-backfeed risk. Even then, the UK would likely keep conditions: a 600W to 800W cap, certified inverters only, a compliant socket and circuit, G98 notification, and no adaptor or extension-lead chains. And it would not be uniformly DIY: many older UK homes lack modern RCD protection on every circuit, and adding that is still an electrician's job.
This is a direction, not a decision. As of 22 May 2026 the UK Government has not confirmed a DIY route, a mechanism, or a date. The dated, primary-source view is on the BSI 2026 Tracker.
eFIXX, May 2026: a 3-month real-world test of plug-in solar in the UK. Safety bench tests start around the 5-minute mark.
What plug-in solar costs
There are two costs: the kit and the install.
- The kit. An 800W panel-only system is around 499 pounds. A system that includes battery storage is around 979 pounds. Prices move, so treat these as a guide rather than a quote.
- The compliant install. A CPS-registered electrician hardwiring the system and handling the G98 notification typically adds 250 to 450 pounds.
So a realistic all-in figure for a compliant 800W plug-in solar setup in 2026 is roughly 750 to 950 pounds for a panel-only system, and around 1,200 to 1,400 pounds with battery storage. Our postcode solar calculator estimates the annual saving against those costs so you can see a payback period for your specific location.
Who plug-in solar is for
Plug-in solar suits some households far better than others. It is a strong fit if you:
- Rent, or live in a flat, and cannot commit to a full rooftop installation. A portable plug-in system can move with you, and the Renters' Rights Act 2025 means a landlord cannot unreasonably refuse a portable system that needs no permanent structural work. See the renter guide.
- Have a south, east or west-facing balcony, wall or patch of garden that gets meaningful daylight.
- Are home during the day, or run a fridge, freezer, router and other base load that quietly consumes power while the sun is up. The more you use directly, the better the maths.
It is a weaker fit if your only outdoor space is deeply shaded, if you are out of the house every daylight hour with almost no base load, or if you own your roof and have the budget for a full rooftop system, in which case conventional solar will usually return more.
How to install plug-in solar compliantly
The compliant path in 2026 is short and worth following in order:
- Choose a kit whose microinverter is on the ENA G98 type-test register. Our microinverters guide covers the four UK-available options and how to verify each one.
- Engage a CPS-registered electrician to hardwire the system to your consumer unit. This is the step that makes the install compliant.
- Your installer submits a G98 notification to your Distribution Network Operator, usually within 28 days under the connect-and-notify route. The G98 form walkthrough shows the paperwork field by field, and the G98 and DNO guide explains the wider process.
For the full regulatory background, including the eight wiring branches that decide compliance, see BS 7671 and plug-in solar in the UK.
Plug-in solar vs rooftop solar
They are not competitors so much as different tools. Rooftop solar is a larger investment with a larger return, suited to homeowners who will stay put. Plug-in solar is a smaller, lower-commitment system suited to renters, flat-dwellers and anyone who wants to start small. Germany installed well over a million balcony systems before the UK market matured, and the lessons from the German balcony boom are a useful read on where the UK is heading.
Where to go next
This page is the overview. Each link below goes deeper on one part of plug-in solar.
Common questions
Written by Adeniyi Adeniji, Founder of Plug Solar Hub. Last reviewed 20 May 2026. Regulatory points are checked against the named standards; see the BSI 2026 tracker and changelog for updates.
