Key takeaways
- • Plug-in solar in Great Britain is limited to a maximum output of 800W.
- • Savings depend heavily on how much electricity you use during daylight hours.
- • Permission may be required if you rent, lease or live in a managed building.
Fifteen minutes of checks before you order saves most of the problems people report afterwards.
The site
Watch your intended location across a sunny day and note when it is shaded. Measure the space, check the railing or wall type, and confirm the direction it faces with a phone compass.
The permissions
Landlord, freeholder or managing agent consent in writing. Conservation area or listed status if relevant.
The product
- Inverter output and G98 certificate
- Panel certification and dimensions
- Mounting hardware included or extra
- Cable length from panel to connection point
- Warranty terms and who handles claims
- Weight, and whether your mounting surface can take it
The install
Check whether you already have a suitable socket and modern residual-current protection. A compliant plug-in solar device is designed for ordinary-person installation using the manufacturer-supplied plug. If you need a new outdoor socket, circuit alteration or assessment of older or unclear wiring, get advice from an appropriately qualified electrician before buying. DNO notification is a separate network requirement. See our socket guide, safety checklist and DNO notification guide.
The maths
Put your region, orientation, shading and tariff into the calculator and look at the low scenario, not the high one. If the low scenario is still acceptable, the purchase is sound.
The seller
UK entity, clear returns policy, published contact details and documentation available on request.
Verifying UK compliance before you order
Compliance is the difference between a system your network operator accepts and one that creates problems at sale, insurance or inspection time. Ask the seller for four documents, and treat the kit as unverified if they cannot produce them.
1. G98 compliance certificate for the microinverter 2. UKCA or CE declaration of conformity 3. Panel datasheet with IEC 61215 and IEC 61730 certification 4. Installation manual specifying an approved connection method
Inverter output matters more than panel wattage
Rules are written around what the inverter feeds into the grid. Panels rated above the inverter output are normal and fine — the inverter clips the peak. What matters is that the inverter output is within the limit and certified.
Connection method
For the Great Britain plug-in framework, look for a compliant product specifically designed to connect to a suitable UK mains socket using the manufacturer-supplied BS 1363 plug. Warning signs include instructions requiring improvised extension leads, multi-way or travel adaptors, modified plugs or a connection method that does not match the product documentation. See the current plug-in solar rules.
Mounting and structural safety
Balcony and wall mounts must be rated for wind loading. Check the fixing specification against your building type and height, and ask a structural professional if you are above the second floor.
How we label compliance
We mark each product as verified, self-declared or not verified, record the source used and the date checked. Verified means we have seen documentation from the manufacturer or a named retailer.
Frequently asked questions
Sources
Fact-check status: reviewed. Read our editorial policy. General information only — not electrical, legal or financial advice.