Plug-in solar panels: what they are, what they output and what you get

The phrase describes the panels inside a complete plug-in solar kit, not a separate product you buy on their own. A kit is one tested combination: solar PV panels, a small microinverter matched to them, the mounting hardware, and a connection lead terminating in a BS 1363 fused plug. Plug it into a suitable socket and the panels offset electricity your home is already drawing.

That distinction matters commercially as well as legally. Loose panels sold with the suggestion that you can wire your own plug-in system are not a compliant plug-in solar device, and pairing mismatched panels with an inverter you bought elsewhere invalidates both the product specification and the warranty.

Panels versus rooftop solar

The panels themselves are conventional silicon PV — the same technology as a rooftop array, in similar physical sizes. The difference is scale and connection method. A rooftop system is wired into your consumer unit by an installer and might run to several kilowatts. A plug-in kit is capped at 800 VA of AC output, is entirely reversible, and is not designed to power a home during a power cut.

Panel capacity is quoted in DC watts under standard test conditions. Modern panels used in plug-in kits typically fall between 400 W and 630 W each, with physical dimensions around 1.7–2.0 m tall by 1.0–1.1 m wide. A kit's headline figure is the sum of its panels, so a two-panel kit at 445 W each is described as an 890 W kit.

Every kit in the range uses the same microinverter, limited to 799 VA of continuous AC output. Going up the range buys you more panel area capturing light for more of the day — not a higher peak output.

A 1,260 W array behind a 799 VA inverter looks like a mismatch until you consider how rarely panels reach their rated figure in Great Britain. Rated output assumes 1,000 W/m² of irradiance at 25°C. Real British conditions — lower irradiance, imperfect angles, panels that warm up and lose efficiency — mean a typical panel spends most of its working day well below its nameplate.

Oversizing the DC array pushes the inverter up towards its ceiling earlier in the morning and holds it there later into the afternoon. On the brightest few hours of the best summer days the inverter reaches its limit and clips the excess. That clipped energy is a small annual loss compared with the extra generation gained on every ordinary day.

Generation depends on orientation, tilt, shading and where in Great Britain you are. A south-facing, unshaded, well-tilted array on the south coast will considerably out-produce an east-facing patio in central Scotland with a building opposite.

The realistic money side of that is set out in the cost and savings guide. Note that ballast weights are not included — see our guide to balcony solar.

A complete kit is supplied ready to install without buying anything extra. Alongside the panels you get the matched microinverter, the DC leads that connect the two, mounting hardware appropriate to the kit, and the AC connection lead with its fused plug. Nothing is sourced separately and nothing is spliced into your fixed wiring.

The full contents list, the setup sequence and the support position are on kit contents and setup.

The safety detail sits in the safety guide, and the notification process in the G98 guide. For the rules as a whole, start with the plug-in solar UK pillar guide.

Plug-in solar panels are sold by specialist retailers, including our own range, and by hardware brands marketing plug-and-play solar in the UK. Government has also named large retailers as engaged in the rollout, though that is not the same as stock on a shelf. Our guide to where to buy plug-in solar panels in the UK sets out who sells what and the checks to run before you order. To buy from us, compare the four SocketPower kits.