How does plug-in solar work, start to finish?
The short answer
Panels, a small box, a plug. Nine steps from wondering about it to saving on it.
This is the whole thing in one page, with links to the detail where you need it. Allow twenty minutes to read, an afternoon to set up.
Plug-in solar became legal in England, Scotland and Wales on 27 August 2026. It is genuinely simple, but there is a gap between “simple” and “obvious”, and a few of the steps below catch people out. Work through them in order.
What a kit actually is
Three parts, and that is all:
- One or two solar panels. Each one is about two metres by one, and makes somewhere between 340W and 515W in bright sun.
- A microinverter. A box roughly the size of a hardback book, bolted behind the panel. It converts what the panels make into ordinary mains electricity, and it is the part that holds the output to 800W.
- A mounting frame and a lead with a plug on the end.
You put the panels somewhere sunny, plug the lead into a wall socket, and the electricity goes into your house’s wiring like any other supply. Your appliances take it because it is nearer than the grid. Anything you do not use flows out to the street.
There is no switch, no controls and nothing to manage. When the sun is on the panels, it is working.
The nine steps
Check you are allowed
England, Scotland and Wales only. Not Northern Ireland, and not the Isle of Man, which has its own rules. If you rent, are a leaseholder, or live in a listed building, get written permission before you spend anything. Renters and landlords.
Find the spot
Watch where the sun falls across a whole day. South-facing and tilted is best. A garden frame beats a wall. Note where the shadows land at two in the afternoon in December, not just in June.
Check the socket
A fixed outdoor socket within reach, ideally on a circuit with no lighting and no boiler. No extension leads, ever. If you need a socket fitted, budget for an electrician. Sockets and safety.
Work out whether it pays
Where you live, where the panels point, and who is home in the day. Use the calculator, then read is it worth it for the cases where the answer is no.
Choose a compliant kit
It must be marked Compliant on the ENA register. Check the exact model reference, because some makers have near-identical names where one is compliant and one is not. Our kit tracker lists every one on sale.
Tell your network operator
Free, five minutes, and a legal requirement. Do it before you plug in, not after. How to notify.
Set it up
Follow the maker’s instructions. Use the mounting system supplied, never cable ties or rope. Fix the supplied label at your fuse box.
Plug it in
Straight into the wall socket. Most microinverters take a minute or two to start, then report to an app.
Change when you use power
This is where the money is. Move the washing, the dishwasher and anything else heavy to the middle of the day. What 800W will run.
The rules in brief
| Question | Answer |
|---|---|
| Do I need permission? | No. You notify your network operator, which is not the same thing. |
| How big can it be? | 800W from the inverter. Panels up to 2,000W. Over 960W of panels, consider a wiring check. |
| How many kits? | One per household. |
| Can I add a battery? | No. Batteries are outside the rules. |
| Extension lead? | No. Fixed wall socket only. |
| Planning permission? | In England, usually not, but never on timber surfaces or listed buildings. Check locally in Scotland and Wales. |
| Will I be paid for the surplus? | Normally no. |
| Northern Ireland? | Not covered by these rules. |
Each of those is explained properly on is plug-in solar legal in the UK.
The mistakes we see most
Reaching for an extension lead Not allowed
The most common and the most serious. Have a socket fitted instead.
Skipping the notification Required
It is free and nobody can refuse you, so there is no reason to miss it out.
Buying the wrong model number Check first
Several kits differ from a non-compliant twin by one character. Match the exact reference.
Buying before checking permission Costly
Renters and leaseholders can be told to take it down and make good.
Ignoring the shade Check first
One shadow across a panel costs far more output than people expect.
Buying in November Expectations
December makes a third of what July makes. It is not broken, it is winter.
Where to go next
- Is plug-in solar legal in the UK? The rules, in full, with the sources.
- The kit tracker. Every compliant kit on sale, searchable.
- Choosing a kit. What to compare, and what the specifications actually mean.
- The savings calculator. Postcode in, realistic figure out.
- Is it worth it? Including when it is not.
- What will 800W run?
- Sockets, leads and safety.
- Telling your network operator.
- Renters and landlords.
- Flats and balconies.
- Batteries.