Plug-In Solar Panels With a Battery: What the UK Rules Allow

In the UK, you can plug an 800W solar kit into a socket, but not a battery. Anyone looking for plug in solar panels with battery storage today needs a fixed system instead, wired in by an electrician.

That route takes more work than a plug-in kit, but it is well established and lets you use your solar power after dark. Below is what the rules say, why batteries were left out, and how the fixed alternative works in practice.

What do the UK rules say about plug-in batteries?

The regulation that made plug-in solar legal defines a plug-in microgenerator as one that is not designed to import electricity from your home in order to store it for later (SI 2026/848, regulations 2 and 3, in force 27 August 2026). Storing energy for later is what a battery is for, so it sits outside that definition.

Ofgem's decision approving the change to the G98 connection rules for plug-in devices is explicit: plug-in electricity storage devices remain prohibited from being sold, supplied or used in the UK (Ofgem, DCRP/MP/26/02, 11 August 2026).

The rules also reach the solar kits themselves. Every compliant kit must come with instructions carrying a prominent warning that it is not intended to be connected to, operated with or used in conjunction with a battery energy storage system (DESNZ, Plug-in Solar Device Interim Product Specification v2.0, July 2026, section 8.3.2). Adding a battery alongside a plug-in kit falls outside the framework as well.

Why were batteries left out?

The government's response to its consultation says battery-integrated products raise additional technical and regulatory issues that the work behind the new rules did not assess, and that it will keep developing evidence on them (DESNZ, Plug-in Solar: government response, July 2026). It sets no date for a decision.

The specification itself shows why the question is not trivial. It describes plug-in solar as connecting to a final circuit originally designed for drawing power from the grid, and caps each device at 800VA and 3.5A, one per circuit, so that the current through the connection to the consumer unit stays within safe levels (sections 1 and 4.1). A battery is a second, larger source of current on the same kind of circuit, and that is the part no product standard yet covers.

How do you get solar panels and a battery legally?

Through a fixed installation. The panels connect to a battery and inverter, and an electrician wires the system into your consumer unit on its own circuit. Ofgem's decision describes conventional microgenerators in exactly those terms, as fixed-wire installations carried out by competent installers.

The grid paperwork follows the usual connection rules, which Ofgem's decision restates: G98 covers generation up to 16A per phase across all the generators at the property, about 3.68 kW at 230 V; above that, the G99 requirements apply instead. If you already have rooftop panels, the new system counts towards the same limit, and your installer handles the paperwork for whichever route applies.

The simplest version of this is an all-in-one unit that takes the panels directly. The Zendure SolarFlow 2400 Pro is one example. Panels connect straight to its four MPPT inputs, up to 3,000W in total, and it stores the surplus in a 2.4 kWh battery that expands to 16.8 kWh with additional 2.88 kWh modules.

The system is certified to ENA G98 and must be installed by a Part P-registered electrician, which is why it ships with hardwiring terminals rather than a plug. It is listed from £1,099, before the cost of panels and installation, and works with a smart meter clamp so the battery covers household demand once the sun drops.

Plug-in kit or fixed solar battery: which suits you?

If you are weighing up plug-in solar panels in the UK with a battery against a kit on its own, the two options solve different problems. The right one depends mainly on whether you own the property and when you use most of your electricity.

A plug-in kit suits renters, flats and anyone who wants a low-cost start, because it moves with you and needs no electrician. Its output, though, can only be used as it is generated. Households that are out during the day and use most of their power in the evening get more from storage, and for them the fixed route is the one that delivers it.

For a wider look at the plug-in side, see our plug-in solar beginner's guide.

Frequently asked questions

Can I add a battery to my plug-in solar kit later?

No. The kit's instructions must warn against using it with battery storage, so a battery cannot be added to it. If storage is what you want, plan a fixed solar and battery system from the start rather than trying to extend the kit.

When will a plug-in solar battery be allowed in the UK?

There is no date. The government's July 2026 response says battery-integrated products raise technical and regulatory questions that have not yet been assessed, and commits only to developing the evidence.

Is a portable power station the same thing?

No. A portable power station charged by panels powers appliances plugged directly into it and does not feed your home's wiring, so it is a different category from plug-in solar. It can be useful for camping or a power cut, but it does not reduce what your home draws from the grid in the same way.

Does a fixed solar battery need to be registered?

Yes. Under the connection rules set out in Ofgem's decision, a fixed system connects under G98 or, above 16 A per phase, under G99. Your installer deals with the network operator on whichever route applies to the total capacity at the property.

The short answer

A plug-in solar kit and a battery cannot be combined in the UK at present. The kit is legal on its own; a battery that plugs into a socket is not, and the kit's own instructions must warn against pairing it with storage.

If storage is the goal, plan a fixed system: panels into a battery unit, wired in by an electrician and connected under G98 or G99. It costs more than a plug-in kit, but it gives you solar power after dark today rather than at some point after the rules change.