Plug-in Solar Systems FAQs

These are compact solar setups typically consisting of one or two panels (400W - 450W each) connected to a microinverter. The system converts sunlight into usable AC power and is capped at 800W by the microinverter. They are designed for easy installation in gardens, on balconies, or in smaller outdoor spaces.

These kits are expected to be available through large retailers, online and in-store, such as Lidl and Amazon.

No - unlike standard solar (3kW - 6kW), plug-in solar has significantly lower upfront costs, requires no scaffolding or major electrical works, and can be moved to a different property. However, they generate less power and do not qualify for the Smart Export Guarantee (SEG) because they lack Microgeneration Certification Scheme (MCS) accreditation.

An 800W kit typically retails between £400 and £1,000. Adding a small battery increases the cost to between £1,200 and £1,500.

With estimated annual savings of £60 - £150, the payback period ranges from 3 to 7 years. For example, a £500 system generating 400kWh annually could save roughly £1,000 over a 15-year lifespan.

No. Because these systems lack Microgeneration Certification Scheme (MCS) accreditation, they cannot participate in the Smart Export Guarantee (SEG). Any excess energy generated is exported to the grid for free, meaning the primary benefit is offsetting your own consumption.

Yes, it is highly recommended. The Institute of Engineering and Technology (IET) advises that a competent electrician should inspect your home's wiring before connecting a plug-in system. Older UK housing stock (78% predating 1980) may have outdated Residual Current Devices (RCDs) or fuseboxes not designed for two-way energy flows, posing fire and electrocution risks.

If you are buying a kit online before the regulations change, it needs to be installed by a professional electrician on a dedicated circuit. Additionally, an electrician can check the safety of the rest of the system.

Under current regulations, a G98 notification must be completed within 28 days of installation, alongside a professional install. However, the government is considering simplifying this process or removing the requirement entirely, though this has not been confirmed as yet.

No. Microinverters are designed with ‘anti-islanding’ protection, meaning they automatically shut off during a power outage to protect grid workers. Therefore, plug-in solar cannot power your home during an outage, unless a specific battery setup is used to divert energy (a feature not yet confirmed for standard kits).

Key risks include overheating, fire, and electrocution if installed:

• on outdated circuits
• if unverified DIY wiring
• if multiple units are daisy-chained
• where there is uncertainty over the age or safety of wiring
• in loose, damaged, or cracked sockets
• where there is discoloration and/or scorch mark around sockets
• in unusually warm plugs or sockets
• in circuit breakers that trip frequently
• in older fuse boxes rather than consumer units
• if plugged into extension cables/adapters
• if plugged into circuits that are near capacity.

In a best-case scenario, an 800W system can cover baseload devices such as:

• WiFi routers (approx. 8W)
• Energy-efficient lightbulbs (approx. 11W each)
• Fridges (cycling at approx. 30% of the time)
• Dishwashers or washing machines on eco-cycles
• Basic PCs and monitors

Panels should ideally face South for peak usage, though East or West orientations work for morning or evening peaks. They must be clear of shade and angled between 30 and 35 degrees.

High-quality solar panels are typically warranted for 25 years, while microinverters are rated for 10 to 15 years. Lower-quality panels may only have a 10 to 15-year warranty.

The British Standards Institution (BSI) was estimated to release new product standards in July 2026.

It is advisable to check with your insurer.