Fronius has stated that new Fronius inverters commissioned on or after 1 June 2026 must be registered in Fronius Solar.web to qualify for the free warranty extension1. The requirement appears in the warranty conditions published on the manufacturer's UK and international warranty pages, and applies to the free extension rather than to the underlying product warranty1.
The free cover differs by inverter size. Units below 50 kW secure 10 years of free warranty cover on registration, while units of 50 kW and above secure 5 years1. Registration must take place on the Solar.web portal within 30 months of delivery, and the warranty cover itself starts when the product is commissioned1. Fronius notes that the warranty term and services may vary by country and region1.
| Inverter size | Free warranty cover on registration |
|---|---|
| Below 50 kW | 10 years |
| 50 kW and above | 5 years |
Beyond the free period, owners can pay to extend cover to up to 15 years1. The paid extension can only be purchased within 6 months of the start of the warranty period, and the price varies by inverter model, displayed when the extension is selected1. A return is possible within 14 days of purchase, after which the warranty certificate is no longer valid1. Fronius states that when verifying whether a warranty exists, the information held in the Fronius system is relevant, not the warranty certificate1.
"To qualify for the free warranty extension, new Fronius inverters commissioned on or after June 1, 2026 must be registered in Fronius Solar.web."
Not everything on a Fronius system can be registered. Ohmpilot and Smart Meter units have serial numbers but cannot be registered in Solar.web because an extended warranty is not available for them, and the invoice serves as proof of warranty instead1. Batteries from BYD or LG are not Fronius products and cannot be registered, and Fronius accessories are excluded from product registration1. Where an open service request is linked to a serial number, a paid extension can only be bought once that request is resolved1. Data in Solar.web may take up to 24 hours to update after an extension1.
Why it matters for households
An inverter is the component that converts a roof array's direct current into usable household electricity, so its working life sets a practical ceiling on how long a home can generate and use its own power. A warranty that runs for a decade rather than a default shorter term changes who carries the cost if the unit fails in year eight or nine, and that cost sits with the household otherwise. Because the free extension now depends on registration for units commissioned from 1 June 2026, the paperwork step sits between a home and that cover. Registration is handled through Fronius Solar.web, and the wider terms for the Fronius solar inverter range and the larger three-phase Fronius Symo models are set out separately. Households weighing inverter choice against panel cover may also want the site's material on solar panel warranties and degradation, and on hybrid inverters where a battery is part of the plan.
What happens next
The 1 June 2026 date has passed, so the registration condition applies to newly commissioned units from that point. The 30-month registration window and the 6-month window for buying a paid extension run from delivery and from the start of the warranty period respectively1. Fronius has not reported a change to the 14-day return period or to the 24-hour data update time1.