What is Tier 1 Solar Panels?
A bankability ranking of solar manufacturers by financial strength, not a measure of panel quality.
Quick Answer
UK installers often advertise Tier 1 panels as a quality badge, but the term only reflects manufacturer bankability. LONGi, JinkoSolar, JA Solar, Trina and Canadian Solar are all Tier 1. It is worth checking the actual panel specs (efficiency, warranty, degradation) and the installer's reputation rather than relying on the Tier 1 label alone.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Tier 1 Solar Panels Explained
Tier 1 is a classification from BloombergNEF that ranks solar panel manufacturers by their bankability, meaning how readily banks finance projects using their panels. It is based on financial stability, scale and track record, not on the technical quality or efficiency of the panels themselves. A Tier 1 listing signals the company is large and financially sound enough to be likely to honour a 25-year warranty, which is a useful but limited reassurance.
How Does Tier 1 Solar Panels Work in the UK?
UK installers often advertise Tier 1 panels as a quality badge, but the term only reflects manufacturer bankability. LONGi, JinkoSolar, JA Solar, Trina and Canadian Solar are all Tier 1. It is worth checking the actual panel specs (efficiency, warranty, degradation) and the installer's reputation rather than relying on the Tier 1 label alone.
Frequently Asked Questions
What does Tier 1 mean for solar panels?
Tier 1 is a BloombergNEF ranking of manufacturer bankability, based on financial strength, scale and track record. It indicates the company is likely to survive to honour its warranty. It is not a measure of panel quality or efficiency.
Are Tier 1 solar panels better quality?
Not necessarily. Tier 1 reflects the manufacturer's finances, not the panel's performance. A Tier 1 brand is a reasonable bankability signal, but always compare the specific panel's efficiency, warranty and degradation, and check the installer's reputation.
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John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.