Hello,
NREL has developed a new set of weather files that you can use with SAM for locations in India. The dataset includes typical-year data suitable for most simulations, and single-year data that you can use with SAM's P50/P90 simulations (although the number of years is small for a statistically meaningful analysis).
The data is available from the NREL Renewable Resource Data Center's
India Solar Resource Data
page. To download weather files for a particular location, you need the locations latitude and longitude in decimal degrees.
Best regards,
Paul.