Battery balcony solar is not covered by the new rules. Here is what that means

The plug-in solar framework that takes effect on 27 August 2026 covers solar panels. It does not cover batteries. If the balcony kit you are considering includes storage (and most of the heavily marketed ones do), it sits outside the new rules entirely.

That is a boundary in the law. Battery systems have not been banned, and nothing about them became less safe on 27 August. What changed is that panel-only devices gained a narrow, specific permission to be connected with a plug, and battery devices did not. What follows sets out where the line falls, why it falls there, and what it means for what you buy and how it gets connected.

The exclusion, in the government’s own words

The government response accompanying the framework is unambiguous: “The proposals… relate only to plug-in solar devices without batteries. They do not extend to plug-in batteries or other forms of plug-in microgeneration.”

The statutory definition reinforces that. SI 2026/848, the Plugs and Sockets etc. (Safety) Regulations 1994 and Electricity Safety, Quality and Continuity Regulations 2002 (Amendment) Regulations 2026, made on 16 July 2026, defines a “plug-in microgenerator” by a set of cumulative limbs. The device must:

• convert sunlight directly into electricity
• have a maximum rated AC output not exceeding 800 watts
• connect by a standard plug and socket
• operate in parallel with the network
• be incapable of importing energy for storage

That last limb is the one that does the work. A device with a battery that charges from the panels and can also draw from the mains is not a plug-in microgenerator for these purposes. Even a system whose battery only ever charges from its own panels is doing something the definition does not describe, and the government response removes any doubt about intent.

Batteries, self-consumption and why the market went that way

Why almost every marketed balcony product has a battery

The reason is self-consumption. An array generates most of its output in the middle of the day, when a lot of households are using very little. Electricity you generate and do not use is exported to the grid, and for plug-in solar you are very unlikely to be paid for that export. The Smart Export Guarantee requires MCS certification and an export-recording smart meter, and plug-in solar sits outside MCS altogether.

A battery fixes that. It parks the midday surplus and releases it in the evening, when the household is actually drawing power. That is why the products with the biggest marketing budgets in this category, the portable-power-station brands in particular, almost all pair panels with storage. It is a genuinely better product for most households. It is also, since 27 August 2026, a product outside the plug-in route.

Battery kits remain legal. They use the older route

Nothing in SI 2026/848 prohibits a domestic battery-and-solar system. The instrument creates a permission. It does not create a prohibition on everything it fails to mention. Before 27 August 2026 there was no lawful plug-and-socket route for any grid-parallel generator, and battery systems were installed all the same, through a fixed connection.

That route is unchanged. In practice it means a competent electrician installs the system with a permanent connection rather than a plug, designs and tests it to BS 7671:2018+A4:2026, and notifies the distribution network operator under G98 where the aggregate is 16 A per phase or less. Amendment 4 to BS 7671, published on 15 April 2026, did make changes relevant to stationary secondary batteries, so the installation standard for storage has moved, for reasons unconnected with plug-in solar.

What you lose by choosing a battery is the plug: the ability to buy a box, hang it on a balcony rail, push it into a socket and be finished. What you keep is everything else. You still need to notify your network operator either way. Our guide to the G98 notification explains how that works.

The trade-off, in numbers

An 800 W south-facing array in central England produces roughly 650 to 760 kWh a year on PVGIS modelling. What you save depends almost entirely on how much of that you use yourself.

• No battery, household out all day: self-consumption of around 30% to 35% is a realistic planning assumption. At roughly 25p per kWh that is somewhere around £50 to £60 a year.
• With storage, or someone home during the day: self-consumption of 70% to 90% becomes achievable. On the same generation and the same unit price, that is roughly £150 to £190 a year.

So a battery does roughly double to triple the annual saving, on these assumptions. Against that, it costs considerably more than a panel-only kit, and the fixed connection means an electrician’s fee on top. The government’s own working assumption for panel-only plug-in devices was £400 to £600, though the first ENA-listed kits on the UK market are priced above that. We work the arithmetic through in whether plug-in solar is worth it.

Watch for kits sold as compliant when they are not

The commercial pressure here is obvious. A battery product marketed as “plug-in”, “compliant with the new UK rules” or “approved from 27 August” would be making a claim the framework does not support. Manufacturers of genuine plug-in microgenerators must register the device on the ENA Type Test Register and obtain confirmation of compliance before placing it on the market. A battery device cannot be registered for this framework, because it does not meet the definition.

The practical test is a reference number. Ask the seller for the ENA listing reference for the exact model. If they cannot produce one, the product falls outside the plug-in route, whatever the listing says. Our guide to checking the ENA register covers what a valid reference looks like and what to do when a seller cannot answer.

Will batteries be brought in later?

Possibly, but nothing has been announced. The government response confines the framework to devices without batteries and says nothing about extending it. There is no consultation and no draft instrument, and no date has been given. Anyone telling you plug-in batteries are “coming next year” is guessing.

For a buyer in 2026 the choice comes down to this. If you want the simplicity of the plug and you are content with a smaller saving, buy a panel-only device, check it is on the ENA register, and notify your network operator. If you want the larger saving that storage delivers, budget for an electrician and treat it as a small conventional installation. Both routes are lawful, and only the panel-only one falls under the new rules.

For where each route leaves you overall, start with the legal rules in full, or compare what is actually available on our comparison page.