Sun angle < 0 fatal error

[cdeline]

Passing NaN values into the RADIANCE gendaylit function should not be allowed - we need to implement some better error checking here to prevent errors and nonsense from very low sun angles and very low dni. specifically within RadianceObj.gendaylit at the output of the np.arcsin() function.

/home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:1662: RuntimeWarning: overflow encountered in scalar subtract
sunalt = np.arcsin((ghi-dhi)/(dni+.001))*180/np.pi # reverse engineer elevation from ghi, dhi, dni
/home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:1662: RuntimeWarning: invalid value encountered in arcsin
sunalt = np.arcsin((ghi-dhi)/(dni+.001))*180/np.pi # reverse engineer elevation from ghi, dhi, dni
/home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:2143: Warning: oconv: fatal - (!gendaylit -ang nan 56.04273662073834 -W 34 4 -g 0.2 -O 1 ): bad arguments for source "sun"
warnings.warn(err[9:], Warning)
/home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:2875: UserWarning: AnalysisObj not successful.
warnings.warn('AnalysisObj not successful.')

[shirubana]

Not very low dni, we have functions that set dni to .0001 to know source of light Get Outlook for Android<https://aka.ms/AAb9ysg>

…

________________________________ From: Chris Deline ***@***.***> Sent: Tuesday, November 11, 2025 11:25:48 AM To: NREL/bifacial_radiance ***@***.***> Cc: Subscribed ***@***.***> Subject: [NREL/bifacial_radiance] Sun angle < 0 fatal error (Issue #582) CAUTION: This email originated from outside of NREL. Do not click links or open attachments unless you recognize the sender and know the content is safe. [https://avatars.githubusercontent.com/u/23244088?s=20&v=4]cdeline created an issue (NatLabRockies/bifacial_radiance#582)<#582> Passing NaN values into the RADIANCE gendaylit function should not be allowed - we need to implement some better error checking here to prevent errors and nonsense from very low sun angles and very low dni. specifically within RadianceObj.gendaylit at the output of the np.arcsin() function. /home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:1662: RuntimeWarning: overflow encountered in scalar subtract sunalt = np.arcsin((ghi-dhi)/(dni+.001))*180/np.pi # reverse engineer elevation from ghi, dhi, dni /home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:1662: RuntimeWarning: invalid value encountered in arcsin sunalt = np.arcsin((ghi-dhi)/(dni+.001))*180/np.pi # reverse engineer elevation from ghi, dhi, dni /home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:2143: Warning: oconv: fatal - (!gendaylit -ang nan 56.04273662073834 -W 34 4 -g 0.2 -O 1 ): bad arguments for source "sun" warnings.warn(err[9:], Warning) /home/kdoubled/.conda-envs/radianceEnv/lib/python3.9/site-packages/bifacial_radiance/main.py:2875: UserWarning: AnalysisObj not successful. warnings.warn('AnalysisObj not successful.') — Reply to this email directly, view it on GitHub<#582>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AFOEOZSJWSMDYJYE7YFZK7T34IS2ZAVCNFSM6AAAAACLZTY7V2VHI2DSMVQWIX3LMV43ASLTON2WKOZTGYYTGNBQG4YTEMY>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>