Got questions about the new 800W laws? We’ve broken down the legal, financial, and technical details to help you get started with confidence.
Legality & Regulations
Is it legal to plug solar into a UK socket now?
Yes. As of April 15, 2026 (BS 7671 Amendment 4), “Type Tested” 800W kits are officially legal for DIY installation via a standard 13A socket. The new “Chapter 708” rules provide the legal framework for this.
What is the 800W limit everyone is talking about?
The UK has aligned with European standards, allowing up to 800W AC output from the micro-inverter. You can use larger panel arrays (e.g. 1600W) to help on cloudy days, but the inverter must be capped at 800W.
Do I need to ask my energy supplier for permission first?
No. For systems under 800W, you follow the “Connect and Notify” rule. You can plug in your kit today, but you must notify your District Network Operator (DNO) within 28 days via a free online form.
Can my landlord or building manager stop me?
Under March 2026 DESNZ guidelines, plug-in solar is a portable appliance. Because it is non-permanent and requires no drilling, it is difficult for landlords to refuse, similar to a satellite dish.
Why was it “illegal” before April 2026?
It wasn’t the panels that were illegal, but the connection method. Amendment 4 updated the wiring regs to safely allow “back-feeding” into a socket using Type-Tested G98 inverters.
What is the October 15, 2026 deadline?
This is the end of the transition period. After this date, all new kits must strictly follow the final BSI product standards. High-street kits from retailers like Aldi already meet these rules.
Savings & ROI
How much will I save at current 2026 prices?
At the April 2026 price cap (24.67p/kWh), a standard 800W kit typically saves between £110 and £180 per year depending on your region and daytime usage.
What is the typical Payback Period?
With kits costing £400–£600, most reach “break-even” in 3.5 to 5 years. Since panels last 25 years, the remaining 20 years are essentially “pure profit” electricity.
Can I really earn money back? I heard the UK isn’t set up for this.
Yes, as of 2026. Historically, you needed an MCS certificate (pro install) to get paid for solar export. However, following the 2026 deregulation, major suppliers now allow 800W plug-in users to register for SEG (Smart Export Guarantee) payments using only their DNO Notification confirmation. You will need a smart meter (SMETS2) to track the export.
Equipment & Installation
Can I use an extension lead with my solar kit?
No. Kits must be plugged directly into a permanent wall socket. Extension leads are not designed for continuous solar load and can pose a fire risk.
Do I need a Smart Meter for this to work?
It works with any meter, but SMETS2 Smart Meters are recommended. Older analog meters can spin backwards, which suppliers may view as tampering.
What happens if there is a power cut?
The system shuts down immediately due to “anti-islanding” protection. This prevents your panels from energizing lines while engineers are working on them.
System Care & Ownership
How do I know if my kit is actually working?
Most 800W kits use a smartphone app. If yours doesn’t, you can use a cheap Smart Energy Plug (like Tapo) to see real-time generation on your phone.
Do I need to clean the solar panels?
Yes. Rain does most of the work, but cleaning them with warm water and a cloth twice a year can boost efficiency by up to 15% by removing traffic film and bird droppings.
Can I take the system with me if I move house?
Yes. Because they use non-permanent balcony mounts or ground stands, you can simply unplug them and take them to your next property.