Plug-In Solar Is Coming To The UK

The picture is moving. The wiring regulations (BS 7671) were updated in April 2026 to recognise small plug-connected solar systems, and the government has confirmed plug-in solar is being legalised. However, the dedicated BSI product standard that will certify specific kits as UK-compliant is still pending — expected mid-2026.

The fully-compliant route today is to have a CPS-registered electrician hardwire your kit into your consumer unit. Once UK-certified plug-and-play kits arrive, true plug-and-go installation will be straightforward.

Not if you tell your insurer. Notify them in writing once your kit is installed — most will simply add a note to your policy at no extra cost. An undeclared electrical installation can give an insurer grounds to refuse a future claim, so this step matters.

Not yet, for plug-in solar. The Smart Export Guarantee currently requires MCS certification of the install, and DIY plug-in installs can't be MCS-certified. Industry expects a simplified route to be introduced from around 2027. Until then, the savings come entirely from electricity you use yourself — which is fine, because self-consumed electricity is worth more than exported electricity anyway.

For panels on a balcony rail, fence, garden frame, or non-rooftop wall in a standard residential area, no — they fall under permitted development as portable equipment. For listed buildings, conservation areas, or roof-mounted panels, check with your local authority first.

Yes, but at reduced output. Around 70 to 90% of annual generation typically happens between April and September. On a bright winter day you might still see 100 to 300 W; on a heavily overcast December day, output can drop to 20 to 50 W. The annual figures in the calculator already account for this seasonality.

In most cases, yes. Plug-in solar is portable and doesn't require permanent alterations 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 request energy-efficiency improvements. We'd recommend writing to your landlord before installing, with a clear note that the kit is portable and reversible.

Read more at our blog post: The UK Guide to Plug-In Solar for Flats and Rented Homes

A typical 800 W kit in southern England generates roughly 500 to 700 kWh a year. At current unit rates of around 24 p per kWh, savings range from about £70 a year for a household that's out during the day, up to about £175 a year for a household that uses most of the power as it's generated. Use the calculator above to model your own situation.

Yes — and several kits include one as standard or as an add-on. A small 1 to 2 kWh battery captures midday generation you'd otherwise have exported for free, and lets you use it during the evening peak. Pairing a battery with a time-of-use tariff like Octopus Flux can also pay off without any solar panels at all, by charging cheaply overnight and discharging during expensive peak hours.

No. The inverter is required by safety standards to detect a grid outage and automatically shut off (this is called anti-islanding), which protects engineers working on the network. To run essentials during a power cut you need a separate battery system with off-grid mode - plug-in solar kits aren't designed for that.

Be cautious. Kits aimed at the German or Spanish market may not meet UK standards — common issues are uncertified inverters (so anti-islanding behaviour is unverified), missing earth bonding on panel frames, and plug types other than BS 1363. Look for an explicit statement of UK compliance with BS 7671 Amendment 4, and once published, the BSI product standard.