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What you need depends on the usable energy you can actually shift, the continuous power the inverter can supply, and whether the connection, the charge window and the room can accept that hardware. Two honest quotes can differ because they assumed different daily use, backup circuits or charge rates." } }, { "@type": "Question", "name": "Why do usable kilowatt-hours and inverter power both matter?", "acceptedAnswer": { "@type": "Answer", "text": "Usable capacity is the energy the battery can deliver in normal operation. Nameplate capacity is larger, because state-of-charge limits, temperature, efficiency and how the manufacturer defines usable energy all reduce what reaches your circuits. Power is a separate limit: a battery can still show charge and be unable to run several loads at once if the continuous rating is too low. Quotes should separate usable kilowatt-hours, continuous charge and discharge kilowatts, and any short peak." } }, { "@type": "Question", "name": "Can a larger battery always store more cheap or solar electricity?", "acceptedAnswer": { "@type": "Answer", "text": "Not if the charge window or the import limit runs out first. Energy that can enter in a fixed window is set by the lowest of the inverter charge rating, any supply limit and any cap the network has actually set, and losses mean stored energy is less than that product. Extra nameplate capacity that cannot be filled in that window does not improve the design. The same logic applies if winter solar cannot deliver the energy on the days that matter." } }, { "@type": "Question", "name": "Should battery size be based on the annual electricity bill?", "acceptedAnswer": { "@type": "Answer", "text": "An annual total divided by 365 hides the evening peak and the seasonal shape, so it is a weak sizing tool. Half-hourly or smart-meter data is more useful, and a few weeks of readings across a typical week beat a single yearly figure if you do not have a full history yet. A house that uses most electricity while the sun is up may have little worth storing, while a long evening plateau is an energy problem and short spikes are a power problem. Note what runs in the evening, what can be timed, and which loads you would still want in a power cut." } }, { "@type": "Question", "name": "How do solar, heat pumps and EV charging change the battery you need?", "acceptedAnswer": { "@type": "Answer", "text": "UK solar yield is seasonal, so a battery sized on a bright summer day may sit full then, while the same battery may rarely fill from the roof in winter. A heat pump is an energy and power problem together: if its electrical input over expensive hours exceeds what you can put into the battery in the cheap or sunny window, more modules cannot close that gap, and a short boost may exceed the inverter rating. An EV charger that already uses most of the supply’s import headroom leaves little room to fill a battery in the same hours. Storage does not create a faster charge rate or start a load the inverter cannot supply." } }, { "@type": "Question", "name": "Will a home battery run the whole house in a power cut?", "acceptedAnswer": { "@type": "Answer", "text": "Backup is a different job from daily cycling, and whole-building cover for many hours is not the default. Many systems support only selected circuits, and only within the battery’s power rating. If backup matters, name the circuits and the hours you want, and expect the design to be checked against power as well as stored energy. Commissioning should record what is supported in a power cut and what is not." } }, { "@type": "Question", "name": "What should a survey check before you compare kilowatt-hour figures?", "acceptedAnswer": { "@type": "Answer", "text": "Single-phase and three-phase supplies do not accept the same charge rates or inverter arrangements, and consumer-unit space, earthing and cable routes can force a smaller system or extra electrical work. In Great Britain, generation and storage that operate in parallel with the grid are handled by the local distribution network operator under current Energy Networks Association guidance, including EREC G98 and EREC G99 or any successor those operators cite. Thresholds and forms differ by operator and must come from the current guidance, not from a sizing article. Northern Ireland is a separate network." } }, { "@type": "Question", "name": "Is there a UK rule for which room a battery can go in?", "acceptedAnswer": { "@type": "Answer", "text": "There is no single national siting rule on a sizing page. The survey should record the proposed room, whether that product’s installation manual permits it, and any room the manual excludes. It should also record floor construction and stack weight, fire separation, clearances, ventilation, the cable route, and any insurer conditions you have already been given. Insurer conditions are policy-specific, not a UK-wide law." } } ], "dateModified": "2026-06-23T08:37:10+00:00", "about": { "@id": "https://kilowatts.uk/resources/what-battery-do-i-need/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/resources/what-battery-do-i-need/#webpage", "url": "https://kilowatts.uk/resources/what-battery-do-i-need/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/resources/what-battery-do-i-need.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/resources/what-battery-do-i-need.schema" } ], "name": "What size home battery do you need in the UK?", "headline": "What size home battery do you need in the UK?", "description": "What battery do I need depends on usable kilowatt-hours you can shift, inverter power, and whether the charge window and connection can fill it.", "isPartOf": { "@id": "https://kilowatts.uk/#website" }, "publisher": { "@id": "https://kilowatts.uk#organization" }, "inLanguage": "en-GB", "primaryImageOfPage": { "@type": "ImageObject", "url": "https://kilowatts.uk/uploads_resolved/images/995/960.webp", "width": 960, "height": 960 }, "breadcrumb": { "@id": "https://kilowatts.uk/resources/what-battery-do-i-need/#webpage-breadcrumb" }, "datePublished": "2026-10-07T02:12:44+00:00", "dateModified": "2026-10-07T02:12:44+00:00", "author": { "@type": "Person", "@id": "https://kilowatts.uk/authors/david-coleman/#person", "name": "David Coleman", "url": "https://kilowatts.uk/authors/david-coleman/", "sameAs": [ "https://kilowatts.uk/authors/david-coleman/", "https://www.linkedin.com/in/david-martyn-coleman/" ], "jobTitle": "Founder & Renewable Energy Author, kilowatts.uk", "image": { "@type": "ImageObject", "url": "https://kilowatts.uk/uploads_resolved/images/980/320.webp", "width": 640, "height": 640 }, "description": "David Coleman is the founder of kilowatts.uk, a UK-based renewable energy platform. 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