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The control box in the lead tells the car to draw less, typically around ten amps, so terminals and an outdoor socket stay within a safer continuous-load margin. At a nominal supply of roughly 230 volts, that is about 2.3 kW for the whole session. You cannot simply instruct the lead to use the full 13 A rating." } }, { "@type": "Question", "name": "How much more can a 7 kW wallbox add in the same overnight window?", "acceptedAnswer": { "@type": "Answer", "text": "The night is fixed, and a cheap off-peak window is often shorter still, so the rate decides how much energy goes in. Eight hours at about 2.3 kW is in the region of 18 kWh before losses and any cold-weather battery conditioning. Many cars return somewhere around three to four miles per kWh, so that is often a double-figure range top-up rather than a full charge. 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Work it out from your own tariff and mileage before you spend anything." } }, { "@type": "Question", "name": "What should I check before fitting a wallbox, and does solar change the choice?", "acceptedAnswer": { "@type": "Answer", "text": "Check supply headroom, whether the consumer unit can take a dedicated protected circuit, the cable route to where the car parks, charge-port side, tethered or untethered, load management, and smart scheduling for an off-peak window. If solar, a home battery or a second EV are likely, say so before the install, because planning once is simpler than revisiting later. A charger that can follow surplus solar is far more flexible than a fixed low three-pin draw, which may start importing when generation dips or sit idle while surplus is exported. UK arrays still produce on overcast days, and panels often convert more efficiently in the cold than in heat, so daytime solar charging can matter for more of the year than people expect." } } ], "about": { "@id": "https://kilowatts.uk/blog/three-pin-ev-lead-vs-7kw-wallbox/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/blog/three-pin-ev-lead-vs-7kw-wallbox/#webpage", "url": "https://kilowatts.uk/blog/three-pin-ev-lead-vs-7kw-wallbox/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/blog/three-pin-ev-lead-vs-7kw-wallbox.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/blog/three-pin-ev-lead-vs-7kw-wallbox.schema" } ], "name": "Three-Pin EV Lead vs 7 kW Wallbox: Why Rate Beats Time", "headline": "Three-Pin EV Lead vs 7 kW Wallbox: Why Rate Beats Time", "description": "The granny lead supplied with most EVs draws about 2.3 kW. 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Here is why preconditioning fixes it.", "inLanguage": "en-GB", "isPartOf": { "@id": "https://kilowatts.uk/#website" }, "breadcrumb": { "@type": "BreadcrumbList", "@id": "https://kilowatts.uk/blog/cold-battery-rapid-charging-preconditioning/#breadcrumb", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "url": "https://kilowatts.uk/", "item": "https://kilowatts.uk/" }, { "@type": "ListItem", "position": 2, "name": "Blog", "url": "https://kilowatts.uk/blog/", "item": "https://kilowatts.uk/blog/" }, { "@type": "ListItem", "position": 3, "name": "Why Rapid Charging Is Slower When Your EV Is Cold", "url": "https://kilowatts.uk/blog/cold-battery-rapid-charging-preconditioning/", "item": "https://kilowatts.uk/blog/cold-battery-rapid-charging-preconditioning/" } ] }, "datePublished": "2026-09-29T17:16:33+00:00", "dateModified": "2026-09-29T17:16:33+00:00" }, "inLanguage": "en-GB", "isPartOf": { "@id": "https://kilowatts.uk/#website" }, "description": "Cold lithium cells accept charge slowly, so a rapid charger delivers less power on a frosty UK morning. Here is why preconditioning fixes it.", "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", "image": { "@type": "ImageObject", "url": "https://kilowatts.uk/images/authors/david-coleman.webp", "width": 400, "height": 400 }, "description": "David Coleman is the founder of kilowatts.uk, a UK-based renewable energy platform. 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