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Anker's new Solarbank 4 Pro is being sold into the plug-in solar moment, but the small print says a Part P electrician still has to wire it in

Anker put the Solarbank 4 Pro on UK pre-sale at 1,699 pounds for 5kWh, expandable to 30kWh, with plug-in capability built into the hardware for a regulatory change that has not happened. Right now it still needs a Part P-registered electrician on a hardwired connection to the consumer unit, because plug-in solar's 27 August legalisation covers panels only, not batteries.

7 September 2026 · Source: The Eco Experts

Anker's timing on the Solarbank 4 Pro is not an accident. It went on UK pre-sale at 1,699 pounds for a 5kWh unit, expandable in stages to 30kWh, in the same window as plug-in solar's 27 August legalisation, and the marketing leans hard on that association: a home battery for the plug-in generation, sized and priced for the same renters, flat-dwellers and small-garden households the government's own plug-in framework was built for. The detail worth pulling out for anyone reading that pitch is what The Eco Experts' coverage confirms in its small print: the Solarbank 4 Pro has a plug-in capability built into its hardware, but it is not switched on, because plug-in battery storage is not legal in the UK. Today it has to go in the same way any other home battery does, wired to the consumer unit by a Part P-registered electrician.

That is not a flaw in Anker's product, it is an accurate reflection of where the actual legal line sits, and it is the line this site has been pointing out since the 27 August launch: SI 2026/848 legalised self-installed plug-in solar panels up to 800W, full stop. Battery storage was explicitly carved out of that framework from the start, DNO notification under G98 stayed mandatory, and nothing about the panel legalisation touched the rules for storing the power those panels generate. A shopper who has just watched Argos and Octopus sell plug-in panel kits over the counter with no installer required could reasonably assume a battery marketed the same way works the same way. It does not, and a product built with dormant plug-in hardware waiting on a rule change that has not been announced is a clean illustration of how far ahead of the law consumer marketing is currently running.

For a household actually planning storage today, that gap is the whole story: a 5kWh to 30kWh system at this price point is a serious option worth evaluating on its own terms, price per kWh, expansion headroom, the bundled Smart Meter Gen 2 for load-aware charge and discharge scheduling, but it is an MCS-adjacent, electrician-installed purchase, not a weekend DIY one, regardless of what shelf it sits next to. Anker says it is watching UK regulation and will activate the plug-in mode if and when ministers extend the framework to batteries, which nobody currently has a date for. Until that happens, the honest answer for anyone asking whether they can just plug this in is no, and a Part P-registered electrician wiring it into the consumer unit is the same qualified-installer step this site tells every DIY-curious visitor to budget for before they call the panels part of the job done.

Read the original: The Eco Experts. Commentary is Sandwich Solar's own editorial view; the original reporting is credited to its publisher.

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