When to use Spectral Correction

[EllieSian]

Hi, we model a lot of utility scale solar farms in the UK, which use predominantly monocrystalline n-type modules. Occasionally we use p-type modules.

Should we be incorporating Spectral Correction into the simulations?

• Our understanding is that the CREST model is only for Amorphous silicon/thin film modules
• Also, the spectral correction for PV modules in the Sandia database... I couldn't find the database online but since the paper was released in 2004, this would not have included any modern modules. Has this database been updated recently?
• Finally, the FirstSolar spectral correction "is not validated by the scientific community". Hence, we do not use it.

Is our understanding correct? Is there any situation which the Spectral Correction should definitely be used with monocrystalline modules in the UK?

[Linda Thoren]

Hello,

Indeed, your understanding seems to be correct. For Amorphous panels, you will find the parameters regarding the spectral correction in the .PAN file (Model parameters Spectral correction and the tick-box is activated). If you use a panel in the Sandia database (you can find relevant panel in the databases and in the "Availability" filter choose Sandia DB) you will have a choice to apply the Sandia model.

PVsyst provides the option to apply the spectral correction model, developed by First Solar. While this model is particularly relevant for First Solar modules, users may choose to apply it to other technologies at their discretion.