Jump to content

best model for diffuse irradiance and irradiance model for inclined plane


Recommended Posts


Hope that you all are good and thanks for helping me everytime here 

i want to want to know what is best model for irradiation on inclined plan ? Perez??

2) what is best model for diffuse irradiation??

Project locations are UK and Germany 




Link to comment
Share on other sites

Hi anees,

there is no simple answer to this question. Based on our studies we recommend the usage of the "Hofmann" model for diffuse irradiance*, especially when simulating in one-minute resolution. As model for the inclined plane we recommend the "Hay & Davies" model.

You can find out more here:




If you really want to dive deep into the models, I'd recommend our paper on the influence of the various models on the energy yield:



* disclaimer: This model was developed by us as part of my PhD thesis, so our opinion might be biased :)  But we tested and validated it a lot, see the paper here: https://www.mdpi.com/1996-1073/10/2/248


Hope that helps, kind regards,


  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...