W/o solar power output difference

HI all

I am having trouble with results from the same model but two different input weather files. The one I run with meteonorm data for a location, the other I run with ground measured data entered into an existing SAM resource library file. (any advice on doing this the "right way" would be appreciated).

Please see the graphs attached. Can anybody explain why the meteonorm profile is higher during night-time operation than the ground-measured data night time operation?

Thanks
Frank

Hi Frank,

It's hard to say what is causing the difference without seeing the SAM file and actual data. However, it appears that maybe the DNI in the meteonorm data is higher, so more energy goes into storage during the day and is available from storage at night.

Best regards,
Paul.