How to Spot a Non-Compliant Plug-In Solar Kit Before You Buy

Plug-in solar goes legal on 27 August 2026. Here's how to check a kit actually meets the UK spec before you buy — and the red flags to avoid.

With eleven days to go until SI 2026 No. 848 makes plug-in solar legal across the UK, listings for "solar kits" are multiplying on marketplaces, classified ads and social media. Not all of them will meet the new rules. Some are leftover stock from before the interim product specification was finalised, some are imports built for other countries' regulations, and a few are simply chancers hoping buyers won't check the small print before 27 August arrives. Buying the wrong kit isn't just a wasted purchase — it can leave you unable to complete a valid G98 notification, invalidate your home insurance, and in the worst case put a non-compliant device on your household circuit.

Here's what a genuinely compliant "plug-in microgenerator" — the official legal term under the new rules — actually has to look like, and the specific things to check before you hand over your card details.

What the law actually requires

Under SI 2026 No. 848, a compliant plug-in solar kit must meet all of the following:

Output capped at 800VA / 3.5A. This isn't a suggestion — it's the maximum the plug circuit is allowed to push through a standard socket.
A standard BS 1363 plug. No continental two-pin plugs, no adapters, no hardwired connections.
Protected by a 5A fuse. Built into the plug itself, not left to the household consumer unit.
No battery in the plug circuit. The inverter and panel can feed a separate battery elsewhere in your setup, but the plug lead itself must not have a battery wired into it.
No extension leads. The kit has to plug straight into a socket on a dedicated circuit — see the socket selection guide for what counts.
One unit per household. You can't run two 800VA kits off two sockets to get 1,600VA of generation.

If a listing doesn't mention these specifics — or worse, actively contradicts them — treat it as a warning sign, not a bargain.

Red flags to check before you buy

Output above 800W with no VA cap mentioned. A lot of pre-existing "off-grid" panel kits are rated at 1,000W or more because they were designed for camping or shed use, not for plugging into a household ring main. If the listing quotes raw panel wattage without confirming the inverter output is capped at 800VA/3.5A, it isn't compliant for UK household use under the new rule.

A battery built into the plug lead. Some portable power station manufacturers have started bundling their existing battery units with a solar panel and calling the combination a "plug-in solar kit." If the battery sits between the panel and the wall plug — rather than being charged separately via a USB or DC port — it fails the no-battery-in-the-plug-circuit rule.

Bundled extension leads or multi-socket adapters. Compliant kits are designed to plug directly into a wall or outdoor socket. Anything sold with a coiled extension cable "for convenience" is telling you it doesn't expect to reach a socket unaided — which is exactly what's banned.

No UK compliance documentation. A genuine UK-market kit should reference the interim specification or BSI product standard by name, and the seller should be able to produce a declaration of conformity if asked. If a listing has no mention of UK regulatory compliance at all, assume it was built for a different market.

Marketplace listings from unverifiable sellers. eBay, AliExpress and Temu listings for "solar generator kits" have existed for years, mostly aimed at camping and off-grid use. Legalisation doesn't retroactively make old stock compliant. Buy from a UK retailer or the manufacturer directly, not a third-party marketplace seller with no UK trading address.

Prices that look too good against the named UK retailers. As covered in the retailer tracker, B&Q, Currys, Amazon, Screwfix, Wickes and Lidl are all expected to stock compliant kits, with EcoFlow STREAM already taking pre-orders. If an unfamiliar seller is offering something similar for half the price with no brand recognition, treat it as a reason to look closer, not a reason to buy fast.

Why this matters beyond the sale itself

Buying a non-compliant kit doesn't just risk wasted money. Two follow-on problems are worth taking seriously:

Insurance. As the home insurance guide and fire risk guide both cover, insurers are expected to ask whether any plug-in generation equipment meets the recognised UK specification. A kit that doesn't could leave a claim disputed, even if the fault has nothing to do with the panel itself.

DNO notification. A G98 notification to your electricity network operator — mandatory for plug-in microgenerators — requires you to declare the equipment's specification. Declaring a non-compliant device, or one you can't actually verify the specification of, isn't just risky, it can be rejected outright.

If you've already bought something before 27 August that doesn't match the checklist above, don't connect it until you've checked its documentation against the interim product specification in full. It may still be usable — but verify first, plug in second.

Can I return a solar kit I bought that turns out to be non-compliant?

Under UK consumer law, goods must be "as described" — if a seller marketed a kit as suitable for UK household use and it doesn't meet the legal specification, you have grounds for a refund under the Consumer Rights Act 2015, regardless of the retailer's own returns window. Keep the original listing as evidence of what was claimed.

Will B&Q, Currys and Screwfix definitely stock compliant kits from day one?

Most major UK retailers have confirmed intent to stock plug-in solar but haven't all committed to a 27 August shelf date — several are pointing to autumn 2026 restocking. Check the retailer tracker for the latest confirmed dates before assuming stock will be available immediately.

Is it illegal to sell non-compliant kits after 27 August?

The legislation governs what's permitted to be installed and used on a domestic supply, and retailers marketing kits as suitable for that use will be expected to meet the specification. Enforcement details are still being finalised, but a kit that doesn't meet the spec isn't legally usable on your household circuit regardless of who sold it to you.