Merge pull request #457 from NREL/pp/resource_len_warnings

Add resource length warning for easier debugging

reV/SAM/generation.py

@@ -233,6 +233,15 @@ def check_resource_data(self, resource):
             logger.error(msg)
             raise InputError(msg)
 
+        if len(resource) < 8760:
+            msg = (f"Detected resource time series of length {len(resource)}, "
+                   "which is less than 8760. This may yield unexpected "
+                   "results or fail altogether. If this is not intentional, "
+                   "try setting 'time_index_step: 1' in your SAM config or "
+                   "double check the resource input you're using.")
+            logger.warning(msg)
+            warn(msg)
+
     @abstractmethod
     def set_resource_data(self, resource, meta):
         """Placeholder for resource data setting (nsrdb or wtk)"""