SAM weather file

Hello M. Gilman,

Can you tell me please how SAM processes the weather file in order to obtain the annual solar iiradiation on a POA (or nominal POA that is presented as an input in the loss graph when simluation the PV system)? I want to calculate the annual POA solar irradiance by manual calculation

Is there any document that can help me?

Best Regards,

Hello, you can find a pretty readable explanation of such a model on pvpmc.sandia.gov/modeling-steps/ It may not be identical to SAM but you'll find how POA is calculated from TMY.
regards,

Koen

In addition to the resource Koen describes, you can find descriptions of SAM's PV algorithms in the PV reference manual, which is available on the Performance Documentation page of the SAM website:
sam.nrel.gov/performance
Best regards,

Paul.