Solar warranty questions answered
A quotation may advertise a 25-year warranty without explaining which component is protected, who provides the cover, what the remedy is or who pays to reach the equipment.
A solar installation normally contains several different warranties. They should be compared separately.
Guide checked: 21 September 2026
The short answer
A complete solar and battery system can involve the panel manufacturer, inverter manufacturer, battery manufacturer, mounting-system supplier, installer, consumer-code provider and an insurer.
Each may cover a different risk. The longest number on the quotation therefore tells you very little about the protection of the complete installation.
A replacement component is useful, but it may not include fault-finding, labour, scaffolding, shipping, removal, reinstallation or compensation for electricity that was not generated.
Six separate protections
Normally addresses defects in materials or manufacture, subject to the manufacturer's conditions. It may offer repair, replacement, a substitute product or another stated remedy.
Check whether labour, access and shipping are included and whether the warranty must be registered.
Promises that panel output will not fall below a stated degradation curve over time. It is not the same as saying the panel will remain fault-free.
Check how underperformance is measured, who pays for testing and what remedy applies if the threshold is missed.
Covers specified faults arising from the installer's work, rather than a manufacturing defect in the equipment. Examples may include mounting, cabling or weatherproofing issues where the written terms apply.
Confirm the duration, claim route and exclusions.
This is intended to provide separate protection for an eligible installer guarantee if the installer ceases trading, subject to the policy wording and conditions.
It is not a universal extension of every manufacturer warranty. Obtain the actual certificate and keep it safely.
Often has different terms from the panel warranty. The inverter is active power-electronic equipment, so compare the standard period, any paid extension, replacement process and labour treatment.
Check whether internet connection, approved installation or service records are conditions.
May be limited by years, energy throughput, cycles, retained capacity or whichever limit is reached first. Operating temperature, installation location and software connectivity may matter.
Ask what usable capacity is guaranteed at the end of the term and how it will be tested.
Product versus performance
If a panel suffers a covered manufacturing defect, that is generally a product-warranty question. If it still operates but produces less than the warranted degradation curve, that may be a performance-warranty question.
The performance promise is commonly misunderstood. It does not necessarily guarantee the output of your complete roof, because household generation is also affected by weather, shading, soiling, inverter availability, wiring, orientation and monitoring accuracy.
A credible claim process therefore needs evidence that separates panel degradation from other causes.
The expensive exclusions
Before treating a warranty as valuable, check who pays for:
A quotation should not imply that all these items are included unless the written documents say so.
Before accepting a quotation
| Question | Evidence to request | Why it matters |
|---|---|---|
| Who provides the warranty? | Named legal entity and current contact details | The installer and manufacturer are not interchangeable. |
| What exactly is covered? | Full terms, not a brochure headline | Duration alone does not define the protection. |
| What is the remedy? | Repair, replacement, credit or another stated outcome | A remedy may be limited or calculated on a declining basis. |
| Who pays associated costs? | Written position on labour, access, freight and reinstallation | These costs can exceed the value of a component. |
| Does it require registration? | Registration confirmation and deadline | Some extended terms depend on timely registration. |
| What could invalidate it? | Exclusions and maintenance conditions | Location, alterations, internet access or unauthorised work may matter. |
| What if the installer closes? | Insurance-backed certificate and policy terms | An installer promise may otherwise disappear with the business. |
| How do I prove the equipment? | Invoice, model numbers, serial numbers and commissioning pack | A future claim needs a traceable system record. |
If the installer stops trading
A manufacturer warranty may remain available through the manufacturer's UK claim route or an authorised service network. That does not automatically replace the installer who diagnosed faults, supplied labour or guaranteed workmanship.
An insurance-backed guarantee may respond if its qualifying event and policy conditions are met. It should never be assumed from a logo on a quotation: obtain the certificate, check the insured company name and read the policy.
Your statutory consumer rights are separate from a voluntary manufacturer's warranty. For an individual dispute, use current consumer advice and obtain legal guidance where necessary.
Documents to keep
Keep copies somewhere independent of the monitoring app and the installer's customer portal.
Related guidance
A solar panel may continue producing after a warranty ends, while a long performance warranty does not guarantee that every part of the system will remain trouble-free.
Check the property and proposal
Equipment quality, roof condition, mounting, cable routes, inverter sizing, battery location and commissioning still matter. Review the complete proposal rather than allowing one warranty headline to make the decision.
Useful official guidance
This page provides general information, not legal advice. Warranty and policy terms vary, so check the documents issued for the actual installation.