Plug-in solar panels have become available for purchase and installation in Great Britain, following a regulatory change that took effect on 27 August 2026. These systems are designed for DIY installation and cost around £340. While they are much cheaper than traditional roof-mounted solar panels, they are smaller and generate less electricity. They can be mounted on the ground, walls, or balconies, depending on the model, and connect to a standard three-pin socket. The electricity they produce is used in the home alongside power drawn from the grid, helping to reduce energy bills. A typical plug-in solar kit includes one or more photovoltaic panels, a microinverter, and mounting equipment. The panels generate direct current (DC) electricity when exposed to sunlight, which the microinverter converts into alternating current (AC) electricity used in homes. These systems have a maximum output of 800W, meaning they cannot fully replace grid electricity, but they can reduce the amount of power needed from the grid during sunny periods. The UK Government cited the success of plug-in systems in Germany, where over one million such devices have been registered since 2018. UK Energy Secretary Miatta Fahnbulleh described plug-in solar as an affordable way for households to take control of their energy bills. According to Joanna O’Loan from the Energy Saving Trust, these systems can give more people control over their energy use and costs, but access to reliable information is crucial for informed decisions. Plug-in solar panels do not require modifications to a home's wiring and can usually be installed without professional help. They use photovoltaic (PV) cells made from silicon to convert sunlight into electricity. This electricity is converted into AC by a microinverter and fed into the home through a standard three-pin socket. However, the maximum AC output is limited to 800W, regardless of the panel's potential capacity. If the system exceeds 960W of potential power or if the existing electrical setup is outdated, it is recommended to consult an electrician before installation. Plug-in solar kits are now available from several UK retailers, including Argos and Screwfix, starting at around £340. There are more than 20 compliant devices available at 11 retailers. Prices vary significantly, with some models costing up to £1,000, often including longer warranties and features like smartphone app monitoring. Affordable options include the DMEGC Hoymiles HiFlow kit and the UKSOL Solar Pro Compact. Plug-in solar panels can be connected to batteries to store surplus electricity for later use, such as in the evening or overnight. Products like the Zendure SolarFlow 2400 Pro and the Marstek Venus E 3.0 offer battery storage options. These systems are sometimes called balcony solar panels or mini solar systems and are popular in Europe, especially among people in flats or rented homes. Unlike full rooftop installations, plug-in panels are not intended to cover a large portion of a household’s electricity needs but can help reduce usage during the day. To be compliant, a plug-in solar system must meet specific criteria, including a maximum inverter output of 800VA, a solar panel capacity under 2,000W, and the absence of a battery. The inverter must use a standard UK plug with a 5A fuse, and the system must be registered on the ENA Type Test Register. Legislation applies to England, Wales, and Scotland, while Northern Ireland has separate rules. Before purchasing, users should consider factors like compliance with UK safety rules, the suitability of their home’s electrical setup, and the system’s rated output. It is also important to check if permission from a landlord or building manager is needed and to consult an electrician if the existing wiring or socket is unsuitable. While these systems are designed for DIY installation, professional advice is recommended in certain situations.