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Those laboratory conditions, used in the IEC 61215 module standards and the IEC 60904 measurement series, are irradiance of 1,000 watts per square metre, a cell temperature of 25°C, and the air-mass 1.5 spectrum in IEC 60904-3. On a quote, kWp is normally the sum of the module nameplate ratings before inverter, cable, temperature and shading losses. Installers do not derate that headline for British weather, and it is not a promise of bill savings." } }, { "@type": "Question", "name": "Does a 4 kWp system produce 4 kW all the time?", "acceptedAnswer": { "@type": "Answer", "text": "No. A system described as 4 kWp is rated to produce 4 kW of DC power only under those test conditions. It does not produce 4 kW whenever the sun is up, and it does not produce 4 kWh every hour. UK irradiance is often below the test level, and cells on a roof often run warmer than 25°C, which reduces power. Annual energy has to be estimated separately in kilowatt-hours." } }, { "@type": "Question", "name": "How is kWp calculated from module ratings?", "acceptedAnswer": { "@type": "Answer", "text": "The kilowatt-peak line is a multiplication, not a measurement taken on your roof. Ten modules rated 400 watts each give 4,000 watts, which is 4.0 kWp of DC nameplate. If the inverter beside that array is rated 3.6 kW AC, the DC rating is larger than the AC rating. That pairing can be a deliberate design; it does not mean the building receives 4 kW of usable power." } }, { "@type": "Question", "name": "What is the difference between kWp, kW and kWh?", "acceptedAnswer": { "@type": "Answer", "text": "kWp is a nameplate rating of the modules under test conditions. kW is power at one moment, such as the inverter’s AC output or a kettle switching on. kWh is energy over time, which is what meters and bills record and how annual generation should be stated. A 4 kWp array is not a 4 kW supply you can rely on at teatime, and it is not 4 kWh delivered each hour." } }, { "@type": "Question", "name": "Why can two arrays with the same kWp generate different amounts?", "acceptedAnswer": { "@type": "Answer", "text": "The headline rating does not show roof faces, shade or how the building uses electricity. A clear south-facing array will usually yield more kilowatt-hours per kilowatt-peak than a shaded array, or one split across east and west pitches, of the same rating. Inverter size, string design, soiling and any export limit can also leave delivered AC power below the DC rating. Ask for the installer’s own kilowatt-hour estimate, the irradiance data behind it, and the loss assumptions they applied. There is no single UK average yield that is valid for every roof." } }, { "@type": "Question", "name": "Is the kWp on an MCS certificate a guarantee of annual generation?", "acceptedAnswer": { "@type": "Answer", "text": "Where an MCS certificate is issued, the kWp on that paperwork is still the installed DC rating under the nameplate method. It is not a promise of annual kilowatt-hours, and it is not, by itself, proof that any tariff, funding or consumer protection applies. Many UK domestic contracts are written so the installer and the products sit on the Microgeneration Certification Scheme, but scheme rules change. Current MCS guidance matters more than the nameplate figure." } }, { "@type": "Question", "name": "Why is the array kWp often larger than the inverter rating?", "acceptedAnswer": { "@type": "Answer", "text": "Modules rarely sit at their test rating for long, so a slightly smaller inverter may still capture most of the year’s energy. On bright, cold days a crystalline module can briefly exceed its nameplate, and the inverter’s AC rating may then limit output, which is one form of clipping. Clipping is not automatically a fault, but it should be visible in the design notes. An export limit, where it applies to the connection, is a separate constraint agreed with the distribution network operator and is not fixed by the module nameplates." } }, { "@type": "Question", "name": "What should I check beside the kWp figure on a quote?", "acceptedAnswer": { "@type": "Answer", "text": "Ask which module rating was multiplied by how many modules, and which roof faces are included. Ask for the inverter’s AC kilowatt rating, whether output is expected to be limited on bright days, and which orientation, tilt, shading and temperature assumptions sit behind the annual kilowatt-hours. Also ask whether an export limit is expected and whether it was included in the generation figures, and what was checked on the roof structure. A larger kilowatt-peak is not automatically the better proposal." } } ], "dateModified": "2026-06-23T08:37:10+00:00", "about": { "@id": "https://kilowatts.uk/resources/what-is-kwp-in-solar-power/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/resources/what-is-kwp-in-solar-power/#webpage", "url": "https://kilowatts.uk/resources/what-is-kwp-in-solar-power/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/resources/what-is-kwp-in-solar-power.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/resources/what-is-kwp-in-solar-power.schema" } ], "name": "Kwp in solar power", "headline": "Kwp in solar power", "description": "Kilowatt-peak (kWp) is a solar array's DC nameplate under lab test conditions. 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Here's why UK roofs rarely match it, and why annual kilowatt-hours are the honest measure.", "inLanguage": "en-GB", "isPartOf": { "@id": "https://kilowatts.uk/#website" }, "breadcrumb": { "@type": "BreadcrumbList", "@id": "https://kilowatts.uk/blog/why-solar-panels-never-hit-rated-wattage/#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 Your Solar Panels Never Hit Their Rated Wattage", "url": "https://kilowatts.uk/blog/why-solar-panels-never-hit-rated-wattage/", "item": "https://kilowatts.uk/blog/why-solar-panels-never-hit-rated-wattage/" } ] }, "datePublished": "2026-09-25T04:14:32+00:00", "dateModified": "2026-09-25T04:14:32+00:00" }, "inLanguage": "en-GB", "isPartOf": { "@id": "https://kilowatts.uk/#website" }, "description": "A panel's wattage is a lab rating at 1000 W/m² and 25°C. 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