Formual 61 in DRAFT pvsam manual

Is the formal correct it reads
Id = Di + Dc + Dc

Hello,

That equation is not correct. It should read:

Id = Di + Dc + Dh

The incident diffuse irradiance for the Perez model is the sum of the isotropic, circumsolar, and horizon brightening components of the sky diffuse irradiance.

Thank you for pointing out the typo.

Best regards,
Paul.

I thought so. Got a couple more .
Formula 20. ha is lower case (upper case in 17)
Formula 22 should not be arrcos a just a.
The HAR term in 24 and 25 is a bit messed up
I think it should be 180/PI 1/15 arccos HAR
lambda needs to be defined or substituted with lon

Page 14. Formula 7 description 'sunce' instead of since.

Thanks for these. Please let me know if you notice any more errors.

Best regards,
Paul.

Would you rather have a annotated PDF ?

That would be great. You can email it to me at sam dot support at nrel dot gov.

Best regards,
Paul.