13 Days to Go: Your Countdown Checklist Before Plug-In Solar Goes Legal

Thirteen days. That's how long is left until SI 2026 No. 848 comes into force on 27 August 2026 and plug-in solar — officially, a "plug-in microgenerator" — becomes legal to sell and use across the UK. If you've been following the run-up and want to be generating your own electricity the moment the rule changes, the next fortnight is when the groundwork gets done, not the week after.

This is a practical countdown: what to check, book, and order now so there's no gap between "it's legal" and "it's plugged in and generating."

Why the next 13 days actually matter

Retailers haven't started shelf sales yet. As the retailer tracker explains, B&Q, Currys, Screwfix, Wickes and Asda are all expected to stock compliant kits, but none have confirmed a day-one launch date — most are pointing to autumn 2026. The one kit with a known UK date is EcoFlow STREAM, which ships from September, with early-bird pre-orders already open and discounted through 15 September.

That gap between "legal" (27 August) and "on the shelf everywhere" (autumn) is exactly why the prep work matters now. The households who order in the pre-order window and have everything else sorted will be generating power in the first week of legal sales. Everyone else queues behind them.

What "legal" actually means from 27 August

Under the interim spec, a compliant plug-in microgenerator kit is capped at 800VA / 3.5A output, plugs into a standard BS 1363 socket protected by a 5A fuse, carries no battery in the plug circuit, uses no extension leads, and is limited to one unit per household. If any of that sounds unfamiliar, the interim product specification guide covers the full rule set — worth ten minutes before you spend any money.

Your 13-day checklist

Days 13–10: Confirm your socket and circuit. Walk outside and identify which outdoor or garage socket you'll actually use. It needs to be on its own dedicated circuit path — not daisy-chained through an extension lead, which is explicitly banned under the new rule. The socket selection guide covers what counts as compliant and what to check before you commit to a spot.

Days 10–8: Decide where the panel goes. Balcony rail, garden ground mount, or wall bracket — your mounting location affects which kit you should order and how much output you'll realistically get. The starter kit checklist walks through matching a kit to your space.

Days 8–5: Pre-order if you want first-week delivery. EcoFlow's early-bird window closes 15 September, and stock in the first weeks after 27 August is expected to be tight everywhere. If you want a kit installed and running in early September rather than waiting for winter restocks, this is the window to order.

Days 5–2: Sort insurance and notification paperwork. Have a quick call or email ready for your home insurer confirming plug-in solar is covered under your existing policy — most are treating it like any other portable electrical appliance, but check. The insurance guide explains what to ask, and covers whether your setup needs a DNO notification. Under the interim spec, single compliant plug-in units are generally exempt, but it's worth confirming with your network operator if you're at all unsure, especially if you're near the 800VA ceiling.

Days 2–0: Read the no-battery rule properly. One of the most misunderstood parts of the new law: no battery is allowed in the plug circuit itself. That doesn't ban battery storage entirely — it means the battery has to sit on the DC side of the system, not between the inverter and the socket. If you were planning to add storage, the no-battery rule explainer is essential reading before you order anything, since getting this wrong on installation day means returning a kit.

27 August itself: the rule change takes effect, but treat it as "legal to sell and use," not "delivered to your door." If you pre-ordered, expect shipping to begin around this date. If you didn't, the first-week setup guide is worth bookmarking for whenever your kit does arrive — it covers the exact order of operations from unboxing to first export reading.

What not to rush

Don't buy a kit from an unverified seller just to beat the queue. Until 27 August, nothing sold as a "plug-in solar kit" in the UK is legally a compliant plug-in microgenerator, and components bought early (bare panels, generic microinverters) may not meet the finalised interim spec. Stick to manufacturers who have explicitly confirmed UK compliance, like EcoFlow's STREAM range, rather than grey-market imports.

Don't skip the socket and circuit check either. It's the cheapest five minutes of prep on this whole list, and it's the single most common reason first-week installs get delayed — people order a kit, then discover their only outdoor socket is on a shared circuit with the shed lighting, which isn't compliant.

Do I need to wait until exactly 27 August to buy a kit?

You can pre-order now from confirmed compliant ranges like EcoFlow STREAM — pre-orders are legal, since the restriction is on sale and use of the finished product, not on taking a reservation. Delivery and first switch-on will still land on or after the legal date.

Will every retailer have stock on 27 August?

No. Most major retailers — B&Q, Currys, Screwfix, Wickes, Asda — are targeting autumn 2026 for shelf availability, per the retailer tracker. EcoFlow's direct online store is currently the only confirmed early-access route, via September shipping on pre-orders.

What happens if my socket isn't compliant?

If your only outdoor or garage socket runs through a shared circuit, an extension lead, or an unfused spur, you'll need an electrician to install a dedicated, correctly fused socket before you can legally use a plug-in kit there. This is worth arranging in the next fortnight if a quick look at your setup raises doubts — electricians get busiest in the weeks immediately after a legal change like this.