Comparing different TMY/EPW providers : inconsistency of data?

Hi all,

Thanks for your insights. I’ve checked the time zone and it is consistent across all files.
I’ve done a new comparison fo a different location (Los Angeles, USA) and results look more consistent (see image below).

  • Is there a reference document you would recommend for understanding how TMY are built ? Specially about this “cumulative radiation” question.
  • Which TMY/EPW provider would you recommend to design “real life” projects ?