The UK government caps plug-in solar at 800W from Summer 2026. Learn what BS 7671 Amendment 4 means for your home.
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UK 800W UPDATE: New "Plug-In" Solar Laws arriving Summer 2026. See what's changing.
Status: Transitioning (Amendment 4 Active April 15th)
Status: Transitioning (Amendment 4 Active April 15th)
UK 800W Solar Laws 2026: The Definitive Compliance Guide
UK 800W Solar Laws 2026: The Definitive Compliance Guide
For years, the UK was the only major European market where "plug-and-play" solar was technically restricted. As of March 2026, the Department for Energy Security and Net Zero (DESNZ) has officially cleared the path for 800W solar kits to be sold in UK retail stores.
To help DIYers stay compliant, this guide breaks down the three pillars of the 2026 legal framework: The Wiring Regulations, The Product Standard, and the Grid Notification.
1. BS 7671 Amendment 4 (The "Orange Book") Publishing on 15 April 2026, this is the most significant update to UK wiring regulations in a decade. It introduces Chapter 708, which specifically provides the rules for connecting "Small-Scale Plug-In Generators" to a domestic ring main.
The Change: It removes the old requirement that all solar must be "hard-wired" on a dedicated circuit.
The Safety: It mandates that all inverters must have Anti-Islanding Protection, meaning the plug pins must become electrically "dead" within 0.1 seconds of being pulled from the wall.
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2. The 800W AC Limit To ensure absolute safety for older UK housing stock, the government has capped the AC output of these systems at 800W.
Why 800W? A standard UK 13A socket is rated for 3,000W. By capping solar at 800W (approx. 3.5 Amps), the regulations ensure there is zero risk of "thermal runaway" or overheating your home's internal wiring, even if the system runs at full power all day.
DC vs AC: You can often have 1000W+ of panels on your roof or balcony, provided your Microinverter is software-locked to an 800W AC output.
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3. The G98 "Connect & Notify" Process Unlike large rooftop arrays that need prior permission, 800W kits fall under the G98 Micro-generation standard.
The 28-Day Rule: You do not need to ask for permission before you plug in. You simply install the kit, and then you (or the manufacturer’s app) must notify your local DNO (Distribution Network Operator) within 28 days of commissioning.
Smart Meters: While not strictly required by law to run the kit, a Smart Meter is highly recommended so you can track your "Export" and potentially earn money back through the Smart Export Guarantee (SEG).
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Can I plug in a kit today? Strictly speaking: Not yet (Wait until July 2026). While the wiring laws change in April, the BSI (British Standards Institution) is not expected to release the final "Certified Plug-In Kit" standard until July 2026.
Right Now: You should focus on Off-Grid Battery Hubs (like EcoFlow or Anker). These are 100% legal today because they do not "backfeed" the grid.
This Summer: Once the first BSI-certified kits hit the shelves (expected at retailers like Lidl and Amazon), you can legally use the wall-plug method.
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