A home solar system does not have one warranty. Panels, inverter, optimisers or microinverters, battery, mounting, monitoring, workmanship, and roof penetrations can each have different coverage and providers. A 25-year headline normally describes only part of the project.
Read the actual documents and map every failure scenario to a responsible party.
Panel product warranty
The product warranty addresses defects in materials or manufacture under stated conditions. It may cover repair, replacement, refund, or another remedy at the manufacturer's discretion.
Check term, registration, original-purchaser limits, transfer, shipping, access, testing, labour, removal, reinstallation, and exclusions. A free replacement module can still leave substantial scaffold and labour cost.
Confirm who submits a claim if the installer has closed.
Panel performance warranty
The performance warranty promises that panel output will not fall below a stated percentage over time, often with a first-year allowance and annual decline limit.
This is not a guarantee that the household system generates a particular number of kWh. Weather, shade, inverter faults, dirt, grid outages, and design affect annual output.
Claims can require controlled testing that distinguishes module degradation from system losses.
Workmanship warranty
The installer workmanship warranty covers errors in installation for a defined period. It may include mounting, wiring, weatherproofing, commissioning, or labour, but wording varies.
Check whether diagnosis, travel, scaffold, roof repair, replacement labour, and consequential damage are included. Identify the legal installer rather than relying on a sales brand.
Insurance-backed coverage may protect specified obligations if the installer ceases trading, subject to policy terms.
Roof and penetration coverage
Solar mounting can interact with an existing roof warranty. The roofer may require approved attachments, flashing, notification, or authorised labour.
Ask the solar installer who covers leaks at penetrations and for how long. Unrelated roof failure should remain distinguishable from mounting workmanship.
Coordinate records when the roof is repaired or replaced before solar.
Inverter warranty
String inverters often have a different expected service and warranty term from panels. Extensions may be available. Microinverters and optimisers can carry longer product terms but place more electronics on the roof.
Review replacement device, labour, shipping, diagnostic approval, communications equipment, and whether an extension starts from commissioning or purchase.
A future replacement may need updated code compliance or compatibility work beyond warranty coverage.
Battery warranty
Battery warranties can combine years, cycles, energy throughput, retained usable capacity, and operating requirements. Coverage may end when the first limit is reached.
Check permitted charging sources, reserve settings, temperature, internet connectivity, software control, grid-service participation, backup use, and installation requirements.
A capacity warranty usually promises a minimum under test conditions, not that the battery will meet every household need for the full term.
Mounting and balance-of-system warranties
Rails, clamps, fasteners, gateways, meters, disconnects, and other equipment may have separate warranties. Corrosion categories, wind or snow design, compatible modules, and installation method affect coverage.
Small components can stop a complete system. Ask whether the installer stocks replacements and who supports discontinued products.
Monitoring and software
An equipment warranty does not necessarily guarantee a cloud platform, mobile app, cellular connection, API, or third-party integration for the same duration.
Review subscription periods, data ownership, account transfer, remote diagnostics, and what functionality remains offline. Hardware can continue producing after an app is discontinued, but troubleshooting may become harder.
Exclusions
Common exclusions can include improper installation, unauthorised modification, failure to maintain, extreme events beyond ratings, corrosion environment, pests, grid conditions, communications loss, cosmetic change, transport damage, and force majeure.
Insurance may cover storms or accidental damage that a product warranty excludes. Do not assume one policy fills every gap.
Warranty provider strength
A long term has limited value if the provider lacks local support, replacement stock, clear claim handling, or financial durability. Company size alone is not proof, but service pathway matters.
Ask where claims are processed, typical documentation, response time, authorised service partners, and remedy if an exact model is unavailable.
Keep installer and manufacturer responsibilities separate.
Transfer when selling
Some warranties transfer automatically; others require registration, notice, fee, or original proof of purchase. Leases and PPAs allocate responsibility differently because a third party owns equipment.
Prepare certificates, serial numbers, commissioning date, invoices, claim history, and transfer instructions before listing the home.
Missing documents can make valid coverage difficult to use.
How to compare warranty value
Create a matrix with:
- Covered component and provider.
- Term and start date.
- Performance, cycle, or throughput limit.
- Parts, labour, access, shipping, and diagnosis.
- Exclusions and owner duties.
- Transfer requirements.
- Claim contact and evidence.
- Remedy and replacement equivalence.
Price likely uncovered costs such as scaffold or inverter labour into the ownership model.
Before final payment
Verify exact installed model and serial numbers. Register products where required. Obtain the workmanship certificate, electrical tests, approved plans, commissioning report, monitoring ownership, and every warranty document.
Photograph equipment labels and store copies away from the property.
Use Solar Ownership and Maintenance to preserve the record over time.
Solar warranties are strongest when coverage boundaries are clear before a fault. Compare the remedy, labour, exclusions, and provider, not the largest year printed on the proposal.