Model size and Maximum storage

Hi Neborad 

Let me see if I can try to explain. Model size and Max Storage are not directly related.

With a Pro licence each user gets 10GB of storage in the cloud. They can have Datasets, Reports, Workbooks and Dashboards stored on their Power BI account up to a maximum of 10GB.

Also with a Pro licence the maximum size of any one Dataset published to Power BI is 1GB. The size of a Dataset depends on the amount of Data in the Datamodel, and how much is repeated data (Datasets are compressed based on repetition, unique columns are not compressed, but columns with repitition of data are compressed).

So a Pro licence holder could have many Datasets in their account, each one up to 1GB in size. They have a maximum storage size of 10GB, which will be those Datasets (the larger part) and Reports and Dashboards that use those Datasets.

Premium Capacity Workspaces enable larger Datasets, starting at 25GB but with Large Model Support rising much larger, and have a greater amount of storage. There is a limit of 100TB of storage for a Premium Capacity. This is not allocated per user but shared throughout the Premium Capacity workspaces. So you can have many more large Datasets in a Premium Capacity.

See: Manage data storage in your workspaces - Power BI | Microsoft Docs

Hope this helps

Stuart