Plug-in solar for balconies

Balcony solar is one of the most popular ways to use plug-in solar across Europe: a panel or two mounted on a balcony railing or wall, connected to your home so it can offset everyday background electricity use. For flats and upper-floor homes with no roof access, a balcony is often the most practical place to put a small system.

Before going further, the essential caveat: in the UK, plug-in solar cannot currently be legally sold, supplied or used. A Government consultation that could change this is open until 30 June 2026. This guide is here so you can plan sensibly, not so you can buy a system to use today. The detail is on the UK legal status page.

How balcony solar works

A balcony kit is typically one or two panels with a built-in microinverter that converts the panels' DC electricity into mains-compatible AC. The panels are fixed to the railing or a wall, and a lead runs back into the home. Because the system is small and aimed at offsetting daytime background loads — the fridge, router and devices on standby — a balcony's limited space is often enough to make it worthwhile.

As a rough guide, a well-placed 800W system might generate around 600–900 kWh a year in the UK, though a balcony setup often sits at the lower end of that because vertical or partly shaded panels produce less. For an estimate tied to your address and orientation, use our output calculator.

Railing versus wall mounting

There are two common approaches, and the right one depends on your balcony and how permanent you want the setup to be.

Railing mounting hangs panels on the inside or outside of the balustrade using brackets or hooks. It is usually quick to fit, leaves no marks and can be removed easily — which suits renters and anyone who may move. Panels mounted flat against a vertical railing sit more or less upright, which is not the ideal angle but is simple and tidy.

Wall mounting fixes panels to a solid wall, sometimes on an angled frame to improve the tilt. This can be more secure and weatherproof, and an angled frame can lift output, but it is more permanent, involves drilling and is more likely to need permission — particularly where the wall is part of the building's exterior.

Getting useful orientation from a balcony

You cannot move a balcony, so orientation is largely fixed by which way it faces. South gives the most generation in the UK, with east or west giving less but still useful output spread across the morning or afternoon. A north-facing or heavily shaded balcony may produce little worth having.

Tilt matters too. A panel hung vertically on a railing collects less than one angled towards the sun, so where a balcony faces a good direction, an angled frame can be worth the extra effort. Shading from the balcony above, neighbouring buildings or trees will also reduce output, so it is worth watching how the sun tracks across the space through the day.

Safety on a balcony

A balcony adds height and wind to the picture, so the physical fixing deserves real care.

• Secure fixing: use mounts rated for the panel and the railing or wall, and check the structure can take the load. A panel that works loose at height is a serious hazard.
• Wind loading: panels act like sails. Make sure brackets, clamps and any frame are specified for exposed, windy conditions, and tighten fixings periodically.
• No dropped objects: avoid overhanging the railing where a panel, bracket or tool could fall onto people or property below. Tether components during fitting.
• Cabling: route leads so they cannot be tripped over, chafed or trapped by a door or window, and keep connectors out of standing water.

Permissions to check first

Balconies often sit at the boundary between your home and the wider building, so permission is more likely to come into play than it might for a private garden.

• If you rent, your tenancy agreement may restrict fixing items to the exterior or making alterations.
• If you hold a leasehold, the lease and the freeholder may have a say, especially over the building's appearance and structure.
• Where the balcony is part of a communal area or shared structure, building management or a residents' association may need to agree.

Always check before fixing anything. Our guide to landlord and freeholder permission explains what to ask and how to put it in writing, and our planning permission guide covers the situations that need more care.