Generation hours

Greetings!
I have a problem in the simulation: generation starts at 4-5 am in some months, which is not true.
Coordinates: 49.925 36.376
For the simulation were used the NSRDB and ECMWF/ERA resource libraries from PVGIS ( re.jrc.ec.europa.eu/pvg_tools/en/tools.html#TMY ).

I attach the simulation file:

Hi Maxim,

Please double-check that the time zone information in the weather file matches the time stamps. Usually, this kind of offset is caused by the time stamps being in UTC instead of local standard time.

You might also consider using data from the NREL NSRDB, which you can download directly from SAM's Location and Resource page. Recent versions of SAM can access NSRDB for most parts of the world. I was able to use SAM 2024.12.12 to download a TMY file from the NSRDB for the location in your file.

If you continue to have trouble and would like me to help investigate, please attach an example of a weather file that causes the problem.

Best regards,
Paul.