--- title: "Solar Panel Warranties Explained: What 25 Years Really Means | South East Solar Network" description: "The warranty types and lengths to look for on a UK residential solar install." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Organization", "name": "South East Solar Network", "url": "https://southeastsolarnetwork.co.uk", "areaServed": "South East England", "telephone": "+443335671183", "logo": "https://southeastsolarnetwork.co.uk/favicon.ico", "image": "https://storage.googleapis.com/gpt-engineer-file-uploads/attachments/og-images/1696c2df-452b-4380-b418-fd3f1c9a128a" }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://southeastsolarnetwork.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Guides", "item": "https://southeastsolarnetwork.co.uk/guides" } ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Who writes these solar guides?", "acceptedAnswer": { "@type": "Answer", "text": "Every guide is written or reviewed by a member of our in-house team with hands-on install experience, and re-checked quarterly against the latest MCS, Ofgem and DESNZ figures. 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[Home](/)/ 2. [Guides](/guides)/ 3. Solar Panel Warranties Explained: What 25 Years Really Means # Solar Panel Warranties Explained: What 25 Years Really Means The warranty types and lengths to look for on a UK residential solar install. MCS Certified Installers RECC Consumer Code 0% VAT on Solar Up to 25-Year Warranty Finance From 0% APR Rated 4.9 / 5 on Reviews Jump to a section in this guide ## Three separate warranties Panel performance: typically 25-30 years guaranteeing the panel will still produce at least 85-87% of rated output at year 25. Panel product: typically 12-15 years against manufacturing defects. Inverter: typically 10-12 years, extendable to 20-25 years on most brands for a one-off fee at install time. Battery: typically 10-15 years with a stated cycle count (e.g. 6,000 cycles or 60% retained capacity, whichever sooner). ## Workmanship Independent of manufacturer warranties, your installer's workmanship warranty (12 years under MCS / RECC) covers the install itself — leaks, cable issues, mounting problems. ## What a performance warranty actually pays out Performance warranties cover degradation below the guaranteed curve, not just outright failure. If your 400 W panels are producing less than (say) 87% of rated output at year 25 — under standard test conditions, not on a cloudy March afternoon — the manufacturer is liable. In practice, modern Tier-1 panels rarely fall below 90% even at year 20, so performance claims are uncommon. Product-defect claims (delamination, hotspots, junction-box failures) are where you actually use the warranty. ## Inverter warranties: extend at install Inverter extensions bought at install time typically cost £150-£350 to push 10 years to 15 or 20. Bought later, the same extension costs 3-5x more if available at all. Given that inverters are the most likely component to fail during a 25-year system lifetime, the extension is one of the highest-value upgrades on any quote. ## Battery warranty fine print Read the cycle-count cap, the retained-capacity threshold, and the operating temperature limits. Most warranties void if the battery is installed in unconditioned outdoor space below freezing or above 40°C — your installer should site it accordingly. Some warranties also require the battery to be connected to manufacturer monitoring throughout its life; check this if you ever consider an off-grid use case. ## What happens if the manufacturer goes bust? It happens — several once-major panel brands no longer trade. In that scenario, the manufacturer warranty is effectively worthless, but your installer's workmanship warranty (MCS / RECC, 12 years minimum) still covers the work itself. This is one of the strongest arguments for picking installers who'll still be trading in a decade and panel brands with long track records. ## How RECC and MCS protect you Every MCS-accredited installer is required to be a member of a consumer code (RECC or HIES). That gives you an independent dispute resolution route if anything goes wrong — and crucially, a deposit and workmanship guarantee underwritten by an insurance-backed scheme. Even if your installer goes bust, the workmanship cover continues. Always check the certificate references on any quote before you sign. MCS-accredited Vetted installers RECC · TrustMark ## Get a free quote based on your guide Share a few details and a trusted MCS-accredited installer in your area will be in touch shortly. Full namePhoneEmail (optional)Postcode Notes (optional) Your privacy matters: We will only pass your details to **1 vetted solar firm** who we feel is the best match for your needs — never multiple companies. 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Calculate Run the numbers - [Solar savings & payback calculator Model annual bill savings and payback years ](/calculators) - [What size solar system do I need? Right-size your array to your usage ](/calculators) - [Battery storage ROI calculator See the extra savings a battery unlocks ](/calculators) - [EV home charging cost calculator Compare charging on solar vs the grid ](/calculators) Services covered Get this fitted - [Solar Panel Installation MCS-certified solar PV installs across the South East. ](/services/solar-panel-installation) - [Solar Battery Storage Tesla, GivEnergy, Fox ESS and more — fully fitted, fully certified. ](/services/solar-battery-storage) - [Solar Panel Maintenance Annual health checks that protect your investment. ](/services/solar-panel-maintenance) - [Solar Panel Repairs Fast diagnosis and repair, any brand. ](/services/solar-panel-repairs) Keep reading More UK solar guides - [Are Solar Panels Worth It in the UK in 2026? An honest, numbers-led look at solar economics, payback periods and RO ](/guides/are-solar-panels-worth-it-uk) - [Solar Panel Costs UK 2026: Real Prices, No Sales Spin What you should actually expect to pay for a residential solar system ](/guides/solar-panel-costs-uk) - [Solar Battery Costs UK 2026: Brands, Capacities, Payback What batteries cost in 2026, which brands lead, and how to size storag ](/guides/solar-battery-costs-uk) - [Solar Payback Period UK: 7-10 Years on Most Homes How to model solar payback honestly — and what drives it up or down. ](/guides/solar-payback-period-uk) Find installers Local installers we vet - [Solar installers in Kent Maidstone · Canterbury · Ashford ](/solar-installers-kent) - [Solar installers in Surrey Guildford · Woking · Cobham ](/solar-installers-surrey) - [Solar installers in Hampshire Southampton · Portsmouth · Winchester ](/solar-installers-hampshire) - [Solar installers in West Sussex Worthing · Crawley · Horsham ](/solar-installers-west-sussex) ### More guides [ Are Solar Panels Worth It in the UK in 2026? Read ](/guides/are-solar-panels-worth-it-uk)[ Solar Panel Costs UK 2026: Real Prices, No Sales Spin Read ](/guides/solar-panel-costs-uk)[ Solar Battery Costs UK 2026: Brands, Capacities, Payback Read ](/guides/solar-battery-costs-uk) [All guides](/guides) South East Solar Network MCS-accredited residential solar installers across the South East of England. Vetted, insured, RECC-protected. 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