Frequently Asked Question
Frequently Asked Questions
Everything you need to know about plug-in solar panels in the UK, updated April 2026.
Is balcony solar legal in the UK?
Yes — and the rules just changed significantly. On 24 March 2026, the Department for Energy Security and Net Zero announced that plug-in solar panels will be made available in UK shops within months, with the government updating both the G98 distribution code and BS 7671 wiring regulations to allow sub-800W systems to connect to a standard domestic socket without needing a qualified electrician.
BS 7671 Amendment 4 — the wiring standard that formalises this change — was published on 15 April 2026. The UK BSI product standard that certifies specific kits for the UK market is expected in July 2026. Until that product standard is published, kits currently on sale have not yet been certified to the new UK standard, so check before you buy.
If you want to install a system right now before the product standard lands, a professionally hard-wired system installed by a CPS-registered electrician is the fully compliant route and delivers exactly the same savings.
When will plug-in solar be legal to simply plug in yourself?
The government confirmed legalisation on 16 March 2026. The key dates are: BS 7671 Amendment 4 published 15 April 2026, BSI product standard expected July 2026 — this is when you will be able to legally buy and connect a certified kit yourself.
Retailers including Lidl, Amazon, and EcoFlow are already preparing UK-compliant kits, with widespread availability expected by summer 2026. Once the product standard is published, buying and installing a plug-in solar kit will be as straightforward as buying any other home appliance.
How much does a balcony solar kit cost in the UK?
A complete 800W system — two panels, microinverter, mounting hardware — costs between £850 and £1,400 when installed by a professional under current regulations, which includes approximately £250–£450 for a CPS-registered electrician.
Once the product standard lands and DIY installation is permitted, kit-only prices are expected to fall significantly. German kits — the closest current reference point — cost approximately £210–£300 for a basic 800W setup, or £590–£1,260 with battery storage. UK pricing will settle once certified products reach shelves, but expect competitive pricing from retailers including Lidl and Amazon.
For professional installation in the UK right now, budget £500–£650 for the kit plus £250–£450 for an electrician, bringing the realistic total to £750–£1,100.
How much can I save with balcony solar?
A south-facing system at a 30–35 degree tilt in central England generates around 650–700 kWh per year. At the current Ofgem rate of 27.69p per kWh, that saves around £180 per year. East or west-facing placements generate around 70–80% of that figure. Even Edinburgh generates usable output year-round.
The government's own estimate puts typical annual savings at £70–£110, while industry estimates are £100–£150, with the higher end achievable if you run appliances during daylight hours — shifting your washing machine, dishwasher, and device charging to when the sun is generating.
At a kit cost of £400–£500 once certified products arrive, payback periods of 3–5 years are realistic. After that, you have 15–20 years of effectively free electricity.
Can renters install solar panels?
Yes, and the legal position for renters has improved considerably. Under the Renters' Rights Act 2025, landlords in England and Wales cannot unreasonably refuse improvements that tenants want to make to a property. A plug-in solar system with no structural impact is a strong candidate for that protection.
In practice, you should always notify your landlord in writing before installing anything. A simple letter explaining the system is portable, requires no drilling into the building structure, and can be removed when you leave is usually enough to get a straightforward yes. A landlord's reasonable grounds for refusal are limited to genuine structural concerns about the balcony's integrity, listed building restrictions, or issues with the building's overall electrical capacity.
One key advantage for renters: plug-in solar systems are designed to be portable. When you move out, you take them with you. You are not leaving anything behind for the landlord to worry about.
Do I need planning permission for balcony solar panels?
In most cases, no. Most balcony solar installations do not require planning permission under permitted development rights, provided they are small and unobtrusive. The exception is if you live in a listed building, a conservation area, or a leasehold flat where the freeholder or managing agent has additional approval authority. In those cases, check before you buy.
If you are a homeowner installing panels in a garden, on a shed roof, or on a south-facing wall rather than a balcony, permitted development rights almost certainly apply and no planning application is needed.
What is a DNO and do I need to notify them?
Your DNO — Distribution Network Operator — is the company that owns and maintains the electricity cables in your street. At 800W AC output, a plug-in system falls well under the G98 threshold of 3.68kW. Under current regulations, G98 is a "fit and notify within 28 days" process. No prior approval is needed — you install first, then fill in a free online form. Your DNO depends on your postcode: UKPN covers London and the South East, NGED covers the West Midlands, NPG covers the North East, and SSEN covers Scotland.
The simplified framework being developed may remove even the G98 notification step for fully certified plug-in kits, but until that is confirmed, G98 applies. Your installer will handle this if you use a professional. If you self-install once the product standard is live, the notification form takes around 15 minutes online.
Will my home insurance cover balcony solar?
Until the BSI product standard is published, plug-in solar is not fully certified for the UK market, and insurers may not cover uncertified systems. Once UK-approved kits are available, certified systems should be coverable under standard home contents or buildings insurance — but you must tell your insurer. Failure to disclose a solar installation could invalidate a claim.
Installing a system without professional sign-off under current regulations could invalidate your home insurance entirely in the event of an electrical fault. If you are installing now using a professional, make sure your electrician issues a completion certificate and notify your insurer before the system is commissioned.
Does balcony solar work in cloudy UK weather?
Yes. Solar panels generate electricity from daylight, not direct sunshine. Even in cloudy UK weather, panels still generate enough to offset background usage like fridges, routers, and phone chargers. Output is lower on overcast days — roughly 10–25% of peak capacity — but the system is generating something every daylight hour throughout the year.
Even Edinburgh generates 704 kWh per year from an 800W system, and Cardiff achieves 807 kWh. The UK's solar resource is comparable to much of northern Germany, where over a million balcony solar systems are already running effectively.
Shading is a bigger concern than cloud cover. Partial shading from a railing, a neighbouring building, or a tree can cut output by 30–50%. Before buying, check your balcony or outdoor space for shade at different times of day using a free app such as SunCalc.
Can I use balcony solar alongside my existing rooftop solar?
Yes, in most cases. Plug-in solar simply offsets your home's consumption, so it works alongside an existing rooftop system. However, if your rooftop inverter is already at 3.6kW, adding an 800W plug-in kit takes your total generation over 3.68kW, which may trigger G99 rules rather than the simpler G98 process. Always check your existing inverter rating and your DNO's guidance before adding a plug-in system.
Can I get paid for energy I export to the grid?
Potentially, through the Smart Export Guarantee (SEG). However, you need an eligible renewable electricity system, a meter capable of half-hourly export readings, and installation certified through MCS or an equivalent scheme.
Early UK plug-in solar kits are expected to be designed primarily for self-consumption rather than export. Future systems may support export once regulations evolve further. In practice, the financial case for balcony solar is built on consumption savings — using the electricity you generate rather than drawing it from the grid — rather than export income.
What wattage system should I get?
800W is the expected UK limit, aligned with the European standard. For most renters and flat-dwellers, an 800W system — typically two panels of 400W each — is the right starting point. It covers your base load: fridge, router, standby devices, and appliances you run during the day.
If your balcony only accommodates one panel, a 400W system still generates meaningful savings and is easier to get landlord approval for. You can start small and add panels later, but note that if your panels face different directions — one south, one east — you will need a dual-input microinverter so each panel tracks independently. Replacing an undersized inverter later is more expensive than buying the right one first.
Does plug-in solar work during a power cut?
No. Like standard rooftop solar, plug-in solar shuts down automatically during a power outage for safety reasons. This is a mandatory safety feature — it prevents electricity from feeding back into the grid while engineers are working on it. If backup power during outages is important to you, you would need a separate battery storage system with islanding capability, which is a more complex and expensive setup.
What if my landlord says no?
Under the Renters' Rights Act 2025, a landlord cannot unreasonably refuse a tenant's request to install a plug-in solar system with no structural impact. If your landlord declines, ask them to state their specific grounds in writing. Aesthetic preference alone is not considered reasonable refusal under the Act.
If you face a genuine impasse, Citizens Advice can advise on your rights under the Renters' Rights Act. You can also strengthen your case by offering to use a professional installer, sharing the system specifications, and demonstrating that the mounting causes no damage to the property.