IAM curve is highly overevaluated

[Ronald]

Hi,

• I added a PAN file that I received from a manufacturer into the PVsyst database.
• When I look into parameters by clicking on 'open', I see below window. 

I am curious to understand what does the BLUE  text implies? Why it is not showing for any other manufacture's' modules?

 

[Lazare Fesnien]

The IAM model is defined with the PV module parameters, page "Additional data > Customized IAM".

Here you should define the glass surface type, and PVsyst will attribute the corresponding IAM model.

The PAN file of low light measurements, apart from the integration of this data, is extremely sensitive.

The reference is that at 200 W/m2, the real efficiency is -3%.

[Ronald]

21 hours ago, Lazare Fesnien said:

The IAM model is defined with the PV module parameters, page "Additional data > Customized IAM".

Here you should define the glass surface type, and PVsyst will attribute the corresponding IAM model.

The PAN file of low light measurements, apart from the integration of this data, is extremely sensitive.

The reference is that at 200 W/m2, the real efficiency is -3%.

Dear Lazare,

Thanks for your answer. is that mean, these modules will perform badly at low light (200W/m2) i.e., late evening or night?

[Michele Oliosi]

No, if the module is marked as “low-light efficiency seems over-evaluated”, it means that the model behaves in an optimistic way in low-light conditions. The message serves to point out that it is “not realistic”.