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Solar glass – Certification

SPF has developed two certification procedures specially tailored for solar glass. These procedures include special requirements with regard to the optical properties of solar glass for the two specific applications.

  • Solar Thermal collectors (ST):
    Glass as a transparent cover of insulated solar thermal collectors with a selective absorber.
  • PhotoVoltaic modules (PV):
    PV modules composed of cells made of crystallin silicon directly laminated to the solar glass.

 

For the purposes of a certification adapted one of the above mentioned application, solar glass is graded into different performance categories according to a specially defined glass efficiency value ηGL,ST or ηGL,PV. The following factors are taken into account in the determination of the aforementioned glass efficiency value: optical transmission, incident angle modifier and degradation (transmission reduction due to environmental factors), which are measured and rated according to the specific application. The idea behind it is that when a glass is replaced with another glass in the same performance category no loss of performance should be experienced in the collector or the module.

 

Detailed documents on the certification process.
For transparency purposes all certificates issued are published on our website.

 

Glass efficiency value and classification into performance categories for solar thermal applications (ST)

 

Untreated
glass

 

 

Singlesided
AR-treated glass

 

 

Doublesided
AR-treated glass

 

Class U1

ηGL ≥ 0.900

Class Y1

ηGL ≥ 0.925

Class X1

ηGL ≥ 0.950

Class U2

ηGL ≥ 0.885

Class Y2

ηGL ≥ 0.910

Class X2

ηGL ≥ 0.935

Class U3

ηGL ≥ 0.870

Class Y3

ηGL ≥ 0.895

Class X3

ηGL ≥ 0.920

Class U4

ηGL ≥ 0.850

Class Y4

ηGL ≥ 0.870

Class X4

ηGL ≥ 0.890

No solar glass

ηGL < 0.850

No solar glass

ηGL < 0.870

No solar glass

ηGL < 0.890

 

Glass efficiency value and classification into performance categories for photovoltaic applications (PV)

Untreated
glass

Singlesided
AR-treated glass

Class P1

ηGL ≥ 0.940

Class R1

ηGL ≥ 0.980

 

 

Class P2

ηGL ≥ 0.925

Class R2

ηGL ≥ 0.965

 

 

Class P3

ηGL ≥ 0.910

Class R3

ηGL ≥ 0.940

 

 

Class P4

ηGL ≥ 0.895

Class R4

ηGL ≥ 0.925

 

 

No solar glass

ηGL < 0.895

No solar glass

ηGL < 0.925

 

 

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