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The product warranty, sometimes called the materials and workmanship warranty, covers the panel as an object, including the glass, frame, junction box, bonded layers and manufacturing quality, and it is usually the shorter term. It is not a weather or all-risks policy; impact, storm damage and faults caused by poor installation usually sit with home insurance or the installer's workmanship guarantee. The performance warranty is the longer promise that a working panel will not fall below a stated output in a stated year. Lengths and percentages differ by manufacturer and model, so use the datasheet and full terms for your exact product." } }, { "@type": "Question", "name": "If my panel is out of product warranty, is it at risk?", "acceptedAnswer": { "@type": "Answer", "text": "Not inherently. The end of the product warranty is a contractual date, not a prediction that your particular panel will fail. Hardware faults, where they occur, usually show up earlier rather than decades later. A module that has already performed normally for years has passed the period in which manufacturing defects most often appear. The performance warranty can still be running after the product cover has ended." } }, { "@type": "Question", "name": "Does the performance warranty cover a panel that has stopped completely?", "acceptedAnswer": { "@type": "Answer", "text": "Generally, no. A total failure is a hardware matter, which is the product warranty's territory. The performance guarantee is about the output of a panel that is still working, not one that has stopped. If the product term has already expired, replacement is usually at your own cost unless your installer or supplier offers another remedy." } }, { "@type": "Question", "name": "Who pays for labour, access and reinstallation under a panel warranty?", "acceptedAnswer": { "@type": "Answer", "text": "This is one of the most important things to read in the terms before you buy. Manufacturer cover is often limited to the module itself, while removal, scaffolding or other access, testing and reinstallation may be excluded or treated separately. Who pays can differ between the product warranty, the performance warranty and the installer's workmanship guarantee. Ask at quotation stage who inspects, who pays for testing, and whether the remedy is repair, replacement or a pro-rata settlement." } }, { "@type": "Question", "name": "Do inverters, optimisers and batteries share the panel warranty timelines?", "acceptedAnswer": { "@type": "Answer", "text": "No. Inverters, optimisers and batteries each carry their own warranties, on their own terms, from their own manufacturers. Those terms are usually shorter than a panel's performance warranty. Keep each component's paperwork separately, and do not assume the panel dates apply to the rest of the system." } }, { "@type": "Question", "name": "Does normal year-on-year decline mean my savings will collapse?", "acceptedAnswer": { "@type": "Answer", "text": "No. A slow loss of output is expected ageing, not a fault, and modern performance warranties are built around a gradual maximum annual decline. That is why a long performance term can be offered at all. The system is meant to be a long-lived asset that fades quietly, not a device that suddenly stops. The percentages that apply to you are those in your module's warranty terms, not a generic figure." } }, { "@type": "Question", "name": "Can I claim just because my app shows low output?", "acceptedAnswer": { "@type": "Answer", "text": "Not on an app reading alone. Output on any given day depends on irradiance, temperature, soiling, shading and the time of year, so a damp November morning compared with a lab rating is not a valid test. Low output is more often caused by shading, dirt, an inverter fault, a tripped string or seasonal weather than by panels ageing too fast. A performance claim is judged against the warranty's own measurement basis, usually standard test conditions, and only after proper diagnosis." } }, { "@type": "Question", "name": "What paperwork should I keep so both warranties stay usable?", "acceptedAnswer": { "@type": "Answer", "text": "Most long-term difficulties are administrative rather than technical. Keep the panel and inverter make and model, the datasheets, the full warranty terms rather than a summary, the invoice, commissioning and handover documents, any certification supplied, the system design, and serial numbers if your installer recorded them. Note which company holds the product and performance cover and which holds the installation workmanship guarantee, and check whether cover transfers if you sell. Saving the first full year of monthly generation gives you a baseline if output is ever questioned." } } ], "about": { "@id": "https://kilowatts.uk/blog/two-warranties-on-one-solar-panel/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/blog/two-warranties-on-one-solar-panel/#webpage", "url": "https://kilowatts.uk/blog/two-warranties-on-one-solar-panel/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/blog/two-warranties-on-one-solar-panel.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/blog/two-warranties-on-one-solar-panel.schema" } ], "name": "Two Warranties On One Solar Panel: What Each Covers", "headline": "Two Warranties On One Solar Panel: What Each Covers", "description": "A solar panel has two warranties: one on the hardware, a longer one on output. 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