Hello,
See the video under "Short How-to on Importing Load Data" for a demonstration of how to import your data into SAM:
sam.nrel.gov/financial-models/residential-and-commercial.html
The Help topic for the Electric Load input page also has information about how work with the load inputs.
SAM assumes that load data starts on Monday January 1, and that the first row of data is for the first time step of the year (in the hour ending at 1 am on January 1). You will need to edit the 13 months of data to meet these requirements. For example if your data starts in a different month than January, you could reorganize the order of months so that the data the first month is January. If your data has a strong weekday/weekend pattern, and your electricity rate structure had different rates for weekdays and weekends, you may want to organize the data so that the data starts with the first Monday in January.
Best regards,
Paul.