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Technology & equipment 2 min read

Solar Warranties Explained: What a 25- or 30-Year Warranty Really Covers

The difference between product, performance and workmanship warranties, what voids them, and how to protect yourself before signing.

GPS Engineering Team
Solar Warranties Explained: What a 25- or 30-Year Warranty Really Covers

“30-year warranty” appears in many quotes, but it rarely means what buyers assume. Solar comes with several different warranties, each with its own term and conditions. Understanding them protects you from surprises years later.

Key takeaways

  • The panel product warranty covers manufacturing defects, usually for 12–15 years.
  • The performance warranty guarantees output stays above a set level for 25–30 years.
  • Inverter warranties are usually 5–10 years and can be extended.
  • The installer’s workmanship warranty matters as much as the manufacturer’s.

Types of warranty

Warranty Covers Typical term
Panel product Material and manufacturing defects 12–15 years
Panel performance Power stays above a set level over time 25–30 years
Inverter Failures and defects 5–10 years
Structures Corrosion and structural defects 10–20 years
Workmanship Installation quality, connections, cabling Installer-specific
87–89%approx. guaranteed output after 30 years for N-type panels
0.4%approx. guaranteed annual degradation
12–15years product warranty

Reading a performance warranty

A linear warranty, for example, allows no more than 1% loss in year one and about 0.4% a year after, leaving roughly 87%–89% of original power after 30 years depending on the manufacturer.

What voids a warranty?

  • Installation that doesn’t follow the manufacturer’s instructions.
  • High-pressure water or abrasives when cleaning.
  • Walking on panels or impacts.
  • Mixing incompatible connectors from different brands.
  • Modifications by unauthorised parties.

Before you sign

  1. Ask for warranty certificates in the project’s name.
  2. Confirm an official agent exists in Egypt.
  3. Write the workmanship warranty term and scope into the contract.
  4. Keep a documented maintenance log. See the maintenance schedule.

GPS hands over a complete warranty file with every plant and follows up claims with manufacturers.

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GPS Engineering Team

GPS engineers have designed and built solar plants across Egypt for 15+ years. Here they share what they learn in the field.

Frequently asked questions

Do warranties cover theft or natural disasters?

No. Manufacturer warranties cover defects; theft, fire and disasters need insurance, recommended for larger plants.

How do I know output has fallen below the guarantee?

Through monitoring data and string tests comparing actual and expected power, corrected for temperature and irradiance.

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