Balcony Solar in the UK 2026: The Rules, DNO Notification and What Is Actually Legal

Balcony solar means a small solar system - a few lightweight panels and a micro-inverter - that a household connects to its own electricity supply rather than to a roof. In 2026 the UK Government changed the rules so that systems of up to 800W meeting defined safety requirements can connect through a domestic socket, published the safety study and interim product specification that describe what such a system must be, and brought the new regulations into force on 27 August 2026. This guide explains what changed, what the rules ask of the equipment, what G98 and DNO notification mean, and what to check before you buy - in plain terms, from a supplier that sells this kit rather than an installer that fits roofs.

What changed for plug-in solar in the UK in 2026?

For years the practical position in the UK was that a small solar system had to be wired in by an electrician and treated much like any other generator on the property. On 24 March 2026 the Government announced that it would update the connection rules - G98 and the wiring regulations - so that plug-in solar systems of up to 800W could connect to a domestic mains socket, provided they meet tailored safety standards. BS 7671 Amendment 4 followed on 15 April 2026. On 16 June 2026 the Department for Energy Security and Net Zero published its independent electrical safety study, which tested representative plug-in systems and found they could operate safely on ordinary domestic circuits while also finding real differences in quality between products.

On 16 July 2026 the Government published its response to the plug-in solar consultation together with an interim product specification. The regulations were laid in Parliament the next day and came into force on 27 August 2026. The specification sets out what a plug-in system connected to an existing low-voltage installation through a standard UK plug and socket has to satisfy - including a maximum 800W AC output, anti-islanding protection, a certified micro-inverter and a BS 1363 plug - and it sits alongside G98 and BS 7671. The important word throughout is defined: the door has opened for systems that meet the specification, not for anything with a plug on the end. The framework is new and further guidance is expected, so check the current Government and Energy Networks Association guidance before you connect anything.

What does a plug-in solar system actually consist of?

A plug-in system has four parts. The panels convert sunlight into direct current. A micro-inverter converts that direct current into the alternating current your home uses and, critically, is the component that has to behave correctly on the grid - matching frequency, shutting down if the mains fails, and never exceeding its rated output. Cabling carries the power from the inverter to the connection point. And the connection itself is, under the 2026 framework, a factory-fitted UK plug into an ordinary socket, rather than a hard-wired circuit.

The Ravair system is a worked example of this arrangement: six 120W semi-flexible panels, totalling 720W, feeding a Hoymiles HMS-800-Pro micro-inverter rated at 800W, with the cables and accessories needed to put it together and monitoring through the inverter's app or cloud platform. The panels are semi-flexible rather than glass, which is what makes fixing them to a balcony railing or the side of a garden building practical. Under the interim specification the inverter is the part that carries most of the compliance weight, which is why the next sections spend most of their time on it.

How does balcony solar work day to day?

When the sun is on the panels, the inverter feeds power into the household circuit it is plugged into. Appliances running at that moment - a fridge, a router, a laptop, a heater in a garden office - draw from that supply first and from the grid for anything beyond it. When the panels produce more than the home is using, the surplus flows out to the grid; a small system without a battery has no way to store it, and the specification deliberately leaves storage out of scope.

This is why the fit between a small system and a home that uses electricity during the day matters more than the headline wattage. A household with people working from home, or a workshop or garden office in use through the day, uses daytime generation as it is made. The Ravair system's Hoymiles inverter comes with app or cloud monitoring, so you can see what your own panels are producing rather than take anyone's word for it. How much a given system produces depends on orientation, shading, season and location, so this guide gives no output or savings figures: they would be guesses.

What does the 800W limit mean, and why does it matter?

The 2026 framework is built around systems whose inverter output does not exceed 800W - the same threshold used in several European countries for plug-in solar. The limit is on what the inverter can put into the socket, not on the panels behind it. Keeping the output below the threshold is what allows the connection to be treated as a plug-in appliance rather than a generator requiring a dedicated circuit.

In practice this shapes the whole system. An 800W-class micro-inverter such as the Hoymiles HMS-800-Pro is paired with panels that together sit comfortably within what it can handle - 720W across six panels in Ravair's system. Going larger on the panel side does not raise the inverter's output; it simply reaches the inverter's ceiling earlier on a bright day. If you already have solar on the property, note that G98 treats generation cumulatively for the premises, so an additional system is assessed alongside what is there.

What are G98 and BS 7671, and who do you notify?

G98 is the Energy Networks Association's engineering recommendation for connecting small generators to the low-voltage network. Under it, small systems are notified to the Distribution Network Operator - the company that owns the wires in your area, not your supplier - rather than applied for in advance. Ravair's product page states that the Hoymiles HMS-800-Pro is registered on the UK ENA Register and refers to G98 registration within 28 days of installation. Notification is a form to the DNO with the inverter details; it is the step people most often skip, and it is not optional.

BS 7671 is the UK wiring regulations. The interim specification refers to it because a plug-in system still connects to a fixed electrical installation, and that installation has to be in a fit state to receive it. The specification does not turn a domestic socket into a generator terminal by magic; it sets conditions under which the socket connection is acceptable. If anything about your home's wiring is old, damaged or unknown, a qualified electrician is the right person to look at it before anything is plugged in. Ravair does not carry out or advise on that work.

What should you check before buying a plug-in solar kit?

• The inverter's registration. Look for the inverter on the ENA Register, by model. The Hoymiles HMS-800-Pro is stated as registered; a bargain inverter with no listing is a product you cannot notify correctly.
• The plug. The framework expects a factory-moulded UK plug to BS 1363 with an appropriately rated fuse - not a rewired or adapted plug, and no extension leads, multi-way adaptors or travel adaptors in the chain.
• Output. Inverter AC output of no more than 800W, with anti-islanding protection; panel capacity that suits the inverter rather than dwarfing it.
• The manufacturer's confirmation. A statement that the exact model meets the interim product specification, and installation instructions that describe the plug-in connection.
• Existing generation. Any solar already on the property is counted together with the new system for G98.
• No battery in the box. Storage falls outside the current specification, which the Government is looking at separately; a plug-in kit that includes one is not covered by these rules.
• Warranty, per component. The Ravair balcony system is advertised with a 10-year warranty; warranty terms vary by product and should be checked on the individual listing.

Ravair's own position is blunt about the first point: inverters that are not registered may be cheaper, but they cannot be notified properly and the company will say so rather than sell you one.

Can flexible panels be used on a balcony, and what about flats and rentals?

Semi-flexible panels exist for exactly this situation. At around two kilograms each they can be fixed to a railing or a wall with straps and fittings rather than a frame and ballast, which is the difference between something a balcony can carry and something it cannot. A customer in Bermondsey, London described Ravair's balcony system as high quality and easy to install, and useful because both partners worked from home on alternate days - a good illustration of the daytime-use point above, though not a figure for what it produced.

Living in a flat or renting changes who you need to speak to, not whether the equipment complies. A leaseholder will usually need the freeholder or managing agent's agreement for anything fixed to the outside of the building; a tenant needs the landlord's. Nothing in the 2026 framework removes those obligations, and a system you can unstrap and take with you is an advantage here. If in doubt, ask before you buy, and ask Ravair whether the kit suits the space you have - the team will say if it does not.

Does plug-in solar suit a garden office or workshop?

Often better than a balcony. A garden office or workshop tends to have a wall or roof that faces the sun without a neighbour's balcony above it, it is used during daylight, and the appliances in it - lighting, heating, a computer, small tools - are exactly the daytime loads a small system offsets. The panels fix to the building; the inverter plugs into the outbuilding's supply, which is itself fed from the house, so the same G98 notification and wiring considerations apply.

When the building is not in use, generation still flows back through the supply to the house, so a system on a workshop that sits idle at weekends is not wasted. This is the case Ravair's product is named for - balcony, garden and workshop - and it is the one where a supplier's kit and a homeowner's own effort most often meet in the middle.

Why does the inverter matter more than the panels?

Panels are simple: they either produce or they do not, and a poor one produces less. The inverter is where safety and compliance live. It decides how the system behaves when the grid frequency drifts, cuts generation when the mains fails so that no power is pushed into a dead line, limits output to its rating, and carries the registration that lets you notify the DNO. The 2026 safety study's finding that product quality varied across the market was, in large part, a finding about inverters.

That is why Ravair builds its system around a Hoymiles HMS-800-Pro rather than the cheapest 800W unit available, and why the company says plainly that this makes the kit more expensive than some. It also gives you monitoring - app and cloud - so the system's behaviour is visible rather than assumed. Choose the inverter first and the panels second.

Frequently asked questions

See the full range on the Solar Products page: the Solar Balcony/Garden/Workshop Full System, the Flexible Solar Panel and the Hoymiles 800W inverter, each with current prices and warranty terms on its own listing. Questions about whether a kit suits your space: call 01892 750777.