Dear Tommes,
There are number of things that might be causing the difference. Please see the
release notes
for a basic list of differences between versions that might help you find causes of the difference.
Please check the loss inputs to be sure they are consistent between the files. In SAM 2014.1.14 and earlier, you specify losses on the Performance Adjustment input page. The "Percent of annual output" is a percentage of the output. In SAM 2014.11.24 and later, you specify losses for the CSP models on the Power Cycle page (under "Availability and Curtailment" as a reduction in the output. For example, to specify a 4% loss, you would use 96%, and in the new version you would use 4%.
If you would like me to help you find the source of the differences, please [url=mailto:sam.support@nrel.gov?subject=SAM%20Files%20from%20Support%20Forum t=_self]email me[/url] both the .zsam and .sam files (along with the weather file if it not one that came with SAM).
Best regards,
Paul.
