Plug-In Solar Panels in the UK: The Rules, the Savings and the Limits

What is plug-in solar?

A plug-in solar kit is one or two solar panels, a small inverter and a cable that ends in an ordinary 13-amp plug. You fix the panels somewhere they catch the sun, such as a garden, a wall or some balconies, and plug the kit into a socket. The electricity it generates feeds into your home's wiring and is used by whatever is switched on at the time, so you buy a little less from the grid.

Kits like this are common in Germany, Spain and the Netherlands. Until this summer they could not be sold or used lawfully in the UK, because the rules on plugs did not allow a generator to be connected through one.

Is plug-in solar legal in the UK?

Yes. The government announced in March 2026 that it would make plug-in solar available, consulted on the safety rules in June, and the panels went on sale on 27 August 2026.

The Plugs and Sockets etc. (Safety) Regulations 1994 were amended so that a standard plug can be approved for a plug-in solar kit, and a product specification now sets the safety requirements a kit has to meet. Retailers named by the government include Currys, B&Q, Screwfix, Amazon, Argos and Wickes.

Only buy a kit that states it complies with the UK Plug-in Solar Device Interim Product Specification. Kits made for other countries, and older kits sold online before the rules changed, may not.

How much can a plug-in kit save?

Each kit is limited to 800W of output. In the government's words that is enough to provide up to 20% of an average home's electricity use, with savings of up to £110 a year.

Those are upper figures. What you actually save depends on which way the panels face, how much shade they get, and whether anyone is using electricity while the sun is out. There is no battery, so anything you generate and do not use at that moment flows out to the grid. Export payments under the Smart Export Guarantee normally need an MCS-certified installation, so it is safest not to count on being paid for it.

The rules for using one safely

The product specification sets out what manufacturers have to tell you. The main points are:

• Plug the kit directly into a wall socket. Extension leads, multi-way adaptors, RCD adaptors and travel adaptors are not allowed.
• Use no more than one kit, of up to 800W, on each circuit. Electricity network rules may limit this further until they are updated, so follow the instructions supplied with the kit.
• The specification expects the circuit to be protected by an RCBO (a combined circuit breaker and RCD) and the socket to be in good condition. The government is still testing whether circuit breakers with a shared RCD are acceptable.
• Do not connect the kit to a battery storage system.
• Tell your electricity network operator that you have installed it. The kit's instructions explain how.
• Fix the label supplied with the kit at or near your consumer unit.
• Get permission first if you rent or own a leasehold, and check whether planning permission or listed building consent applies.
• Do not fit a kit to a timber balcony, to certain types of cladding, or to a building that is undergoing fire-safety remediation.

Is your wiring suitable?

This is where we would urge some caution. The specification says that where a home still has older fuse protection without RCBOs, the installation should be checked and, where necessary, upgraded by a professional electrician. It also says a kit must not be connected to damaged or worn sockets, and that you should ask a qualified electrician if you are unsure which sockets share a circuit.

If your consumer unit has rewirable fuses or no RCD test button, get it looked at first. Our NICEIC-approved electricians carry out these checks and consumer unit upgrades across Preston and Lancashire, and our guide to fuse box and consumer unit upgrades explains the warning signs.

Plug-in solar vs rooftop solar

A plug-in kit is a reasonable way to take the edge off a bill if you rent, live in a flat or have no suitable roof. If you own your home and have a usable roof, a rooftop system does far more: several times the output, the option of a battery so you can use your own power in the evening, and payment for what you export. Our savings calculator gives a quick estimate for your home.

Can we install a plug-in kit for you?

Plug-in kits are designed for you to fit yourself, so there is nothing for an installer to sign off. Where we can help is before you buy: checking the consumer unit, the socket and the circuit you plan to use.

And if you decide you want more than 800W, we design and install MCS-certified rooftop solar and battery systems across Lancashire and the North West.