Warranty for Solar Panel Installation in Chennai: What Is Covered and What Is Not

Warranty terms for solar panel installation in Chennai are often presented as a single headline — "25-year warranty" — without explaining which component that number belongs to. The panel, the inverter, the structure, and the labour each carry different warranties from different parties. Knowing what each one covers prevents arguments after installation.

Panel warranty: performance vs product

Tier-1 solar panels carry two separate warranties. The performance warranty guarantees that output will not fall below 80% of rated power by year 25. This is a linear degradation promise from the manufacturer. The product warranty, usually 10 to 12 years, covers physical defects — delamination, cracked glass, junction box failure, and similar manufacturing faults. Performance warranties are almost never claimed in Chennai because the degradation test requires a lab. Product claims do happen, and they go to the manufacturer, not your local installer.

Inverter warranty

String inverters, which handle most residential solar panel installation in Chennai, typically come with a 5-year manufacturer warranty as standard. Many brands offer an optional extension to 10 years for an additional fee. This covers electronics failures, display faults, and communication errors. Physical damage from lightning, flooding, or rodents is usually excluded — that is where your home insurance policy applies. Keep the inverter model number and purchase date in a file; claims require them.

Mounting structure warranty

Hot-dip galvanised structure — the correct specification for rooftop installations in a coastal city like Chennai — carries a 5- to 10-year corrosion warranty depending on the manufacturer. Aluminium rail systems are inherently rust-proof and often carry longer guarantees. Powder-coated mild steel is cheaper and rusts faster in Chennai's humidity; a reputable installer should not use it without disclosing the difference. Ask for the structure specification in writing as part of the quote.

Labour warranty

Labour warranty covers the workmanship — cable entries, roof penetrations, connector crimping, earthing connections, and breaker wiring. This comes from the installer, not from any manufacturer, and varies widely. A one-year labour warranty is common. Some installers offer two. What it should cover: roof leaks at penetration points, loose connections that cause arc faults, earthing that fails continuity testing, and DC connectors that are not properly mated. Get this in writing, with a contact number that is still active after the system is on.

What voids a warranty

Panel warranties are voided by physical damage (hail impact, objects dropped on the glass), unauthorised modifications, and in some cases by mounting the panel outside the specified tilt range. Inverter warranties are voided by opening the casing, exposing the unit to flooding, or running the system outside voltage and frequency limits. Labour warranty claims can be complicated if someone else works on the system after installation — always call the original installer first.

How to file a warranty claim in Chennai

For panel and inverter claims, your installer is the first contact. They will raise the claim with the manufacturer's regional office (most Tier-1 panel brands have a Chennai service presence). For labour issues, call the installer directly. Photograph the problem before anyone touches it. For solar panel installation in Chennai through ZeroEB, call +91 9042517415 — the same number as the installation team. Claims are not managed by a separate call centre.