BSI Standard Plug-in Solar: July 2026

The product standard that decides what can legally be sold as a UK plug-in solar kit. Here's what it covers, what it means for buyers, and the timeline.

The UK's plug-in solar regulations work in two parts. The first — BS 7671 Amendment 4, the wiring standard — landed in April 2026 and made plug-in solar legally installable. The second — the BSI product standard — was published in July 2026 and defines what a compliant kit must look like to be sold through UK retail channels. The SI 2026 No. 848 statutory instrument then set 27 August 2026 as the legal switch-on date.

This piece covers what the BSI standard actually contains, why it matters for buyers, and what to check on any listing before you commit.

What the Product Standard Covers

The BSI product standard will define technical requirements for plug-in solar energy systems (PSES) sold in the UK market. Based on the German equivalent (DIN VDE V 0126-95, published December 2025) and the consultation documents, it will likely cover:

Inverter safety requirements — anti-islanding protection (the inverter must shut down within milliseconds if grid power fails), voltage and frequency ride-through limits, and earth fault protection. All modern micro-inverters from Hoymiles, APsystems, and Enphase already meet or exceed these requirements.

Connector and plug standards — the UK standard may specify approved connector types for the AC output. The German standard permits the standard Schuko plug; the UK equivalent will specify the UK 13A plug with appropriate safety features.

Maximum AC output — confirming the 800W cap already established in BS 7671 Amendment 4.

Labelling and documentation — requirements for clear user instructions, safety warnings, compliance markings (UKCA), and installation guides included with every kit.

Panel and inverter pairing — requirements for matched panel-inverter combinations to prevent mismatched components being sold as "kits."

UKCA vs CE Marking

Post-Brexit, the UK requires UKCA (UK Conformity Assessment) marking rather than the CE marking used across Europe. Currently, European CE-marked products are accepted during a transition period, but the BSI product standard will establish UKCA as the definitive requirement for products sold in the UK.

What this means in practice: manufacturers selling into the UK market will need to produce UKCA-compliant versions of their kits. EcoFlow, Anker, and other major brands are expected to have UK-specific versions ready for the July 2026 launch.

For early adopters with CE-marked kits: existing installations are not affected retroactively. See our early adopters guide for the full position.

What Changes for Buyers

Before July 2026: the UK market has a limited selection of plug-in solar kits, mostly CE-marked European products sold through online retailers and specialist solar suppliers. These are legal to buy and install under the current transitional arrangements.

After July 2026: UK retailers (Lidl, B&Q, Screwfix, Amazon UK) can stock UKCA-compliant kits. This is when the mass-market retail launch happens. Expect:

Multiple branded kits on retail shelves with UK-specific packaging
UK 13A plugs pre-fitted (no adapter needed)
Clear UKCA compliance markings
English-language installation guides designed for UK homes
Competitive pricing as retailers compete for the new market

The BSI standard effectively unlocks mass retail — the moment it publishes, high-street availability follows within weeks.

What It Means for Prices

German experience suggests that once a product standard is published and mass retail begins, prices drop significantly. Germany saw kit prices halve within 18 months of their standard publication, with basic 800W kits falling below €400.

The UK market is likely to follow a similar trajectory. Early-mover pricing in 2026 will be higher; by 2027, increased competition and retail volume should push prices down. If you're not in a rush, waiting until autumn 2026 (a few months after the standard launches) may get you a better deal.

If you want to install now, the current pricing of £500-700 for a complete kit is reasonable and you'll have several months of generation before mass retail begins.

Timeline

Date	Milestone
April 2026	BS 7671 Amendment 4 published — plug-in solar legally installable
April-June 2026	Transition period — CE-marked products accepted
July 2026 (expected)	BSI product standard published
July-September 2026	UKCA-compliant kits reach UK retail
Late 2026	Mass-market availability — Lidl, B&Q, Screwfix, Amazon
2027	Price competition intensifies, budget options emerge

What to Do Now

If you want to install before July 2026: buy a reputable CE-marked kit (like the EcoFlow STREAM) from a trusted retailer. Your installation is legal under BS 7671, your G98 notification protects you, and the product will continue to work regardless of the product standard. See our best kit guide for recommendations.

If you'd rather wait: hold off until late summer 2026 when UKCA-compliant kits are available at retail. You'll have a wider selection and potentially lower prices. The trade-off is missing the best generation months (May-July).

Either way: monitor the BSI publication date. We'll publish a detailed analysis of the standard's requirements as soon as it's released. Follow the pluggedin.solar blog for updates.

For the regulatory background, see our BS 7671 plain English guide and our UK law change guide.

What the published standard actually says (August 2026 update)

Now that the standard has published and SI 2026/848 has fixed 27 August 2026 as the legal date, the buyer's checklist has crystallised. Any compliant UK plug-in solar kit must:

Cap total AC output at 800VA / 3.5A — hard limit, no over-panelling to "smooth" output curves permitted
Use a BS 1363 three-pin plug with a 5A fuse — Schuko-to-UK adapters are explicitly not compliant
Contain no battery in the plug circuit — see the no-battery rule explained
Not require extension leads — see the no-extension-lead rule
Be one "plug-in microgenerator" per household — the legal term, distinct from traditional solar PV
Ship with the G98 notification pack or clear instructions on how to file
Carry UKCA marking (or UKCA+CE during the transition period)
Comply with EN 50549-1 or equivalent grid-code testing

Kits that meet all of the above from launch include the EcoFlow STREAM range, Anker SOLIX, and UK-configured Bright Saver and Craftstrom SKUs.

Retail rollout: what actually happened

The German-style price crash predicted for late 2026 has not fully materialised yet — UK street prices are holding in the £600–£900 range for complete 800W kits. Reasons:

Import duties and post-Brexit UKCA re-certification added roughly 15% vs equivalent German pricing
Retail launch demand outstripped UK warehouse stock in July/August, keeping discounting minimal
Only three brands (EcoFlow, Anker, and one Chinese OEM behind two UK badges) have UKCA at scale so far

Expect the £400–£500 mainstream pricing to arrive in Q2 2027 as more brands complete UKCA and retail volume normalises. If you are optimising for price alone, waiting six months makes sense; if you want the current summer/autumn generation, the maths still works at £700–£800.

Signs a listing is not actually compliant

Even now that the standard has published, non-compliant listings still surface on eBay, some Amazon marketplace sellers, and grey-import specialist sites. Red flags:

Rated at 1000W or higher. No amount of "smart inverter throttling" makes this legal.
Ships with a Schuko plug and a UK adapter in the box. Explicitly non-compliant.
Battery listed as part of the "plug-in kit". Batteries have to sit outside the plug circuit under the interim spec.
No mention of UKCA in the product description. CE-only is a transition-period tolerance, not a permanent one.
Vendor cannot supply a G98 template on request. Legitimate UK-market vendors have this ready.

If a listing looks suspiciously cheap and shows any of the above, walk away. The retailer stocking guide has the current shortlist of vendors we trust.