SPF More info about 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.
Classes U, Y and X

PhotoVoltaic modules (PV):
PV modules composed of cells made of crystallin silicon directly laminated to the solar glass.
Classes P and R

For the purposes of a certification adapted one of the above mentioned application, solar glass is graded into different performance classes according to a specially defined glass efficiency value η_GL,ST or η_GL,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 class no loss of performance should be experienced in the collector or the module.

Glass efficiency and classification into performance classes Solar thermal (ST)

Untreated Glasses		One-sided AR treated glasses		Both sides AR treated glasses
class U1	η_GL ≥ 0.900	class Y1	η_GL ≥ 0.925	class X1	η_GL ≥ 0.950
class U2	η_GL ≥ 0.885	class Y2	η_GL ≥ 0.910	class X2	η_GL ≥ 0.935
class U3	η_GL ≥ 0.870	class Y3	η_GL ≥ 0.895	class X3	η_GL ≥ 0.920
class U4	η_GL ≥ 0.850	class Y4	η_GL ≥ 0.870	class X4	η_GL ≥ 0.890
No solar glass	η_GL < 0.850	no solar glass	η_GL < 0.870	no solar glass	η_GL < 0.890

Glass efficiency and classification into power classes Photovoltaics (PV)

Untreated Glasses		One-sided AR treated glasses		Colored Glasses
class P1	η_GL ≥ 0.940	class R1	η_GL ≥ 0.980	class P C	η_GL > 0.0
class P2	η_GL ≥ 0.925	class R2	η_GL ≥ 0.965
class P3	η_GL ≥ 0.910	class R3	η_GL ≥ 0.950
class P4	η_GL ≥ 0.890	class R4	η_GL ≥ 0.925
no solar glass	η_GL < 0.890	no solar glass	η_GL < 0.925

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