Dear Alex,
For now, please use the one-hour data. There are some problems with some of the calculations at one-minute time steps that we have resolved for the next version.
If you would like to help us test a Beta version to see if you get better results, please [url=mailto:sam.support@nrel.gov?subject=Beta%20version%20for%20one-minute%20CSP%20tests t=_self]email me[/url].
Best regards,
Paul.