Hi Gabriel,
The POA irradiance data option is only available for the Detailed PV model. It is not available for PVWatts.
To enable the option, be sure to choose one of the POA options from the list under
Albedo - Sky Diffuse Model - Irradiance Data (Advanced) on the Location and Resource page:
Attachment poa-input.png not found
Make sure the column of POA data in your weather file uses one of the following headers as described in the
SAM CSV for Solar Help topic
:
poa, pa, plane,plane of array,plane of array irradiance, poa_global
If all of those conditions are met, please attach a copy of your weather file so I can help troubleshoot, or
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